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Gabriel R, dos Santos Lins PV, Vilela FDAM, de Carvalho SHV, Brandão RJ, Soletti JI, Meili L. Synthesis of layered double hydroxides: Investigating the impact of stirring conditions and reactor design parameters. Heliyon 2024; 10:e30116. [PMID: 38699740 PMCID: PMC11063454 DOI: 10.1016/j.heliyon.2024.e30116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Revised: 03/26/2024] [Accepted: 04/19/2024] [Indexed: 05/05/2024] Open
Abstract
The synthesis by coprecipitation of Layered Double Hydroxides (LDHs) is governed by the stages of nucleation and crystal growth associated with the efficiency of the mixing and dispersion process of the reagents. Mixing efficiency is related to process variables, such as agitation speed, type of impeller and baffles presence, among others. In this context, this work proposes an analysis of these variables in a batch reactor, using a 23 factorial design employing the factors: acceleration speed (200 and 1000 rpm), mixing time (2 and 18 h) and presence or absence of baffles. The results were evaluated quantitatively (amount of LDH produced, time and amount of base for the formation of LDHs to begin) and qualitatively (mixing aspects, sedimentation ad grinding). The significant factors affecting the amount of LDH produced (51.94-80.81 g) were agitation speed and aging time. These factors were also correlated with the structural characteristics of the materials produced, such as crystallinity, crystallite size (70.99-174.79 nm), surface area (69.81-97.62 m2/g), pore volume (0.28-0.59 cm3/g), and pore diameter (11.40-34.66 nm). LDHs produced at higher agitation rates (1000 rpm) and longer aging times (18 h) yielded higher quantities of materials (80.81 g) with improved structural characteristics. The study highlights the importance of systematically exploring the synergistic effect between process variables, emphasizing the research potential in this area.
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Affiliation(s)
- Rafaela Gabriel
- Laboratory of Processes, Center of Technology, Federal University of Alagoas, Maceió, Alagoas, 57072-900, Brazil
| | | | | | - Sandra Helena Vieira de Carvalho
- Laboratory of Separation Systems and Optimization Processes, Center of Technology, Federal University of Alagoas, Maceió, Alagoas, 57072-900, Brazil
| | | | - João Inácio Soletti
- Laboratory of Separation Systems and Optimization Processes, Center of Technology, Federal University of Alagoas, Maceió, Alagoas, 57072-900, Brazil
| | - Lucas Meili
- Laboratory of Processes, Center of Technology, Federal University of Alagoas, Maceió, Alagoas, 57072-900, Brazil
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Tabana LS, Adekoya GJ, Tichapondwa SM. Integrated study of antiretroviral drug adsorption onto calcined layered double hydroxide clay: experimental and computational analysis. Environ Sci Pollut Res Int 2024:10.1007/s11356-024-33406-7. [PMID: 38649603 DOI: 10.1007/s11356-024-33406-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Accepted: 04/16/2024] [Indexed: 04/25/2024]
Abstract
This study focused on the efficacy of a calcined layered double hydroxide (CLDH) clay in adsorbing two antiretroviral drugs (ARVDs), namely efavirenz (EFV) and nevirapine (NVP), from wastewater. The clay was synthesized using the co-precipitation method, followed by subsequent calcination in a muffle furnace at 500 °C for 4 h. The neat and calcined clay samples were subjected to various characterization techniques to elucidate their physical and chemical properties. Response surface modelling (RSM) was used to evaluate the interactions between the solution's initial pH, adsorbent loading, reaction temperature, and initial pollutant concentration. Additionally, the adsorption kinetics, thermodynamics, and reusability of the adsorbent were evaluated. The results demonstrated that NVP exhibited a faster adsorption rate than EFV, with both reaching equilibrium within 20-24 h. The pseudo-second order (PSO) model provided a good fit for the kinetics data. Thermodynamics analysis revealed that the adsorption process was spontaneous and exothermic, predominantly governed by physisorption interactions. The adsorption isotherms followed the Freundlich model, and the maximum adsorption capacities for EFV and NVP were established to be 2.73 mg/g and 2.93 mg/g, respectively. Evaluation of the adsorption mechanism through computational analysis demonstrated that both NVP and EFV formed stable complexes with CLDH, with NVP exhibiting a higher affinity. The associated adsorption energies were established to be -731.78 kcal/mol for NVP and -512.6 kcal/mol for EFV. Visualized non-covalent interaction (NCI) graphs indicated that hydrogen bonding played a significant role in ARVDs-CLDH interactions, further emphasizing physisorption as the dominant adsorption mechanism.
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Affiliation(s)
- Lehlogonolo Shane Tabana
- Department of Chemical Engineering, Sustainable Environmental and Water Utilisation Processes Division, University of Pretoria, Pretoria, South Africa.
| | - Gbolahan Joseph Adekoya
- Institute of NanoEnginieering Research (INER) & Department of Chemical, Metallurgical and Materials Engineering, Faculty of Engineering and the Built Environment, Tshwane University of Technology, Pretoria, South Africa
| | - Shepherd Masimba Tichapondwa
- Department of Chemical Engineering, Sustainable Environmental and Water Utilisation Processes Division, University of Pretoria, Pretoria, South Africa
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Zhou S, Li W, Li J, Li R. Impact of inhibitor loaded with pigments content on properties of inorganic zinc rich coatings. Heliyon 2024; 10:e24739. [PMID: 38304816 PMCID: PMC10830574 DOI: 10.1016/j.heliyon.2024.e24739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 01/07/2024] [Accepted: 01/12/2024] [Indexed: 02/03/2024] Open
Abstract
In order to overcome the poor dispersion of traditional inorganic zinc-rich coating, addressing the sedimentation and the agglomeration caused by high zinc powder content and improve the anti-corrosion performance of coatings. In this paper, the molybdate intercalated hydrotalcite flake zinc layer double hydroxide (ZnAl-NO3-/LDH) was synthesized by hydrothermal synthesis method at first, and the KH560 modified the Mo/LDH flake zinc powder was further obtained by ion exchange method. The results show that the samples have a layered structure of hydrotalcite with good crystal structure through X-ray diffraction (XRD) and Fourier transform infrared (FT-IR), and the molybdate corrosion inhibiting ions inserted successfully into the interlayer structure of hydrotalcite. Meanwhile, different contents of pigments and fillers were added into the inorganic zinc-rich coatings. It was found that the Nyquist radius of curvature and modulus value of the coating were the largest with a pigment and filler content of 40 %, the maximum corrosion potential was -0.017V, and the minimum corrosion current density was 3.377 × 10-7 A-cm-2. The result indicates that the coating has the best corrosion resistance with 40 % pigment content, which has good application prospects in the fields of cross-sea bridges, natural gas and oil pipelines et al.
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Affiliation(s)
| | - Weijie Li
- East China Jiaotong University, China
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Kumari S, Sharma V, Soni S, Sharma A, Thakur A, Kumar S, Dhama K, Sharma AK, Bhatia SK. Layered double hydroxides and their tailored hybrids/composites: Progressive trends for delivery of natural/synthetic-drug/cosmetic biomolecules. Environ Res 2023; 238:117171. [PMID: 37734578 DOI: 10.1016/j.envres.2023.117171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 08/31/2023] [Accepted: 09/15/2023] [Indexed: 09/23/2023]
Abstract
Layered double hydroxides (LDHs) are well-known and important class of hydrotalcite-type anionic clays (HTs) materials that are cost-effective with additional advantages of facile synthesis, composition, tenability, and reusability. These convincing characteristics are liable for their applications in various fields related to energy, environment, catalysis, biomedical, and biotechnology. HTs/LDHs are generally synthesized from low cost abundantly available chemical precursors through the aqueous synthetic pathways under mild reaction conditions. These materials can be termed green materials based on their non-toxic nature, availability of precursors, facile and low-cost production using aqueous medium conditions with less hazardous effluents. Diverse and fascinating characteristics have been attributed to HTs/LDHs like anion exchange ability, surface basicity, biocompatibility, controlled release of the anion specific area, porosity, easy surface modification, and pH dependent biodegradability. Hence, HTs/LDHs and their modified and/or functionalized nanohybrids/nanocomposites are reported as the potential drug delivery carriers with a capability to stabilize the susceptible bioactive molecules, may enhance the solubility of poorly soluble drugs along with controlled drug/bioactive molecule release and delivery. These clay and bioactive hybrid materials have good biocompatibility, less cytotoxicity, and better site-targeting with improved cellular uptake than that of free parent biomolecules. These lamellar solids of micro/nanostructure are compatible, host-guest materials and able to fabricate with drugs/cosmeceutical/bio- or synthetic polymers without any change in their molecular structure and reactivity along with improvement in their stabilities. Other important features are facile synthesis, basicity, high stability with easy storage, and efficient administration with low bio-toxicity. This study enlightens the applications of HTs/LDHs along with their hybrids/composites in the field of drug/cosmeceutical/gene delivery systems of natural/synthetic biomolecules.
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Affiliation(s)
- Sonika Kumari
- Department of Chemistry, Career Point University, Tikker - Kharwarian, Hamirpur, Himachal Pradesh, 176041, India; Center for Nanoscience and Technology, Career Point University, Tikker - Kharwarian, Hamirpur, Himachal Pradesh, 176041, India
| | - Varruchi Sharma
- Department of Biotechnology & Bioinformatics, Sri Guru Gobind Singh College, Chandigarh, 160019, India
| | - Savita Soni
- Department of Chemistry, Career Point University, Tikker - Kharwarian, Hamirpur, Himachal Pradesh, 176041, India; Center for Nanoscience and Technology, Career Point University, Tikker - Kharwarian, Hamirpur, Himachal Pradesh, 176041, India
| | - Ajay Sharma
- Department of Chemistry, Career Point University, Tikker - Kharwarian, Hamirpur, Himachal Pradesh, 176041, India; Center for Nanoscience and Technology, Career Point University, Tikker - Kharwarian, Hamirpur, Himachal Pradesh, 176041, India.
| | - Abhinay Thakur
- Department of Zoology, DAV College, Jalandhar, Punjab, 144008, India
| | - Satish Kumar
- Department of Food Science and Technology, Dr. YS Parmar University of Horticulture and Forestry, Nauni, Solan, Himachal Pradesh, 173230, India
| | - Kuldeep Dhama
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Izatnagar, 243122, Uttar Pradesh, India
| | - Anil Kumar Sharma
- Department of Biotechnology, Amity University, Sector 82 A, IT City Rd, Block D, Sahibzada Ajit Singh Nagar, Punjab, 140306, India.
| | - Shashi Kant Bhatia
- Institute for Ubiquitous Information Technology and Applications, Konkuk University, Hwayang-dong Gwangjin-gu, Seoul, 05029, South Korea; Department of Biological Engineering, College of Engineering, Konkuk University, Hwayang-dong Gwangjin-gu, Seoul, 05029, South Korea.
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Canales R, Gil-Calvo M, Barrio VL. UV- and visible-light photocatalysis using Ni-Co bimetallic and monometallic hydrotalcite-like materials for enhanced CO 2 methanation in sabatier reaction. Heliyon 2023; 9:e18456. [PMID: 37576323 PMCID: PMC10412882 DOI: 10.1016/j.heliyon.2023.e18456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 07/11/2023] [Accepted: 07/18/2023] [Indexed: 08/15/2023] Open
Abstract
The CO2 catalytic reduction activities of four different Co-modified Ni-based catalysts derived from hydrotalcite-like materials (HTCs) prepared by co-precipitation method were investigated under thermal and photocatalytic conditions. All catalysts were tested from 473 to 723 K at 10 bar (abs). The light intensity for photocatalytic reactions was 2.4 W cm-2. The samples were characterized to determine the effect of morphological and physicochemical properties of mono-bimetallic active phases on their methanation activity. The activity toward CO2 methanation followed the next order: Ni > Co-Ni > Co. For the monometallic Ni catalyst an increase of a 72% was achieved in the photo-catalytic activity under UV and vis light irradiation at temperatures lower by > 100 K than those in a conventional reaction. Co-modified Ni based hydrotalcite catalysts performed with stability and no deactivation for the 16 h studied under visible light for methanation at 523 K due to the presence of basic sites.
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Affiliation(s)
- Rafael Canales
- Bilbao School of Engineering (University of the Basque Country), Bilbao, Spain
| | - M. Gil-Calvo
- Bilbao School of Engineering (University of the Basque Country), Bilbao, Spain
| | - V. Laura Barrio
- Bilbao School of Engineering (University of the Basque Country), Bilbao, Spain
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Miotto Menino N, da Silveira Salla J, do Nascimento MS, Dallago RM, Peralta RA, Moreira RFPM. High-performance hydrophobic magnetic hydrotalcite for selective treatment of oily wastewater. Environ Technol 2023; 44:1426-1437. [PMID: 34738879 DOI: 10.1080/09593330.2021.2003441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Accepted: 10/29/2021] [Indexed: 06/13/2023]
Abstract
Oil emulsified in water is one of the most difficult mixtures to treat due to the good stability of emulsions, so there is a growing demand for more efficient methods for separating immiscible oil/water mixtures. In this context, the focus of this study was to obtain an adsorbent for the selective treatment of a simulated oily wastewater. To this aim, a modified hydrotalcite sample with hydrophobic and magnetic characteristics was prepared and characterized. Initially, the effect of sodium dodecyl sulfate (SDS) amount on the adsorbent characteristics was evaluated (266-800 mgSDS g-1LDH). The hydrophobic hydrotalcite (LDH-SDS) containing 533 mgSDS g-1LDH (LDH-SDS2) presented a higher interlayer space where the surfactant molecules were arranged perpendicular to the lamellae, allowing better access to the hydrotalcite pores and facilitating the selective adsorption of oil compounds. Moreover, the synergistic association of hydrophobic properties with super-wetting and effective adhesion oil to Fe3O4 favoured the selective adsorption of the simulated oily wastewater onto the hydrophobic and magnetic hydrotalcite (LDH-MSDS), facilitating the post-treatment separation. The kinetic analysis demonstrated that the adsorption equilibrium was attained in 120 min and the pseudo-second order model was the most suitable for predicting the removal of total organic carbon (TOC) from the simulated oily wastewater. The Langmuir model described very well the equilibrium experimental data, with a maximum adsorption capacity for TOC removal using LDH-MSDS of 659.9 mg g-1. Therefore, the modified hydrotalcite prepared in this study showed intrinsic characteristics that make it a promising adsorbent for the selective treatment of oily wastewaters.
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Affiliation(s)
- Naiara Miotto Menino
- Department of Chemical and Food Engineering, Federal University of Santa Catarina, Florianópolis, Brazil
| | - Julia da Silveira Salla
- Department of Chemical and Food Engineering, Federal University of Santa Catarina, Florianópolis, Brazil
| | | | - Rogério Marcos Dallago
- Department of Chemistry, Integrated Regional University of Alto Uruguai e Missões, Erechim, Brazil
| | | | - Regina F P M Moreira
- Department of Chemical and Food Engineering, Federal University of Santa Catarina, Florianópolis, Brazil
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7
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Jeyaseelan A, Viswanathan N, Kumar IA, Naushad M. Design of hydrotalcite and biopolymers entrapped tunable cerium organic cubic hybrid material for superior fluoride adsorption. Colloids Surf B Biointerfaces 2023; 224:113190. [PMID: 36764205 DOI: 10.1016/j.colsurfb.2023.113190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 01/25/2023] [Accepted: 01/31/2023] [Indexed: 02/04/2023]
Abstract
The excess fluoride in drinking water is serious risk which leads to fluorosis. The adsorption method is facile route for defluoridation studies. Hybrid adsorbent possesses unique advantages like high surface area and high stability has been employed for water treatment. In the present work, hydrotalcite (HT) fabricated Ce-metal organic frameworks (MOFs) bridged with biopolymers (alginate and chitosan) namely HT-CeMOFs@Alg-CS cubic hybrid beads was developed and employed towards fluoride removal in batch mode. The fabricated HT-CeMOFs@Alg-CS beads were analyzed by DTA, FTIR, SEM, EDAX, TGA and XRD studies. Besides, FTIR and EDAX proved the affinity of HT-CeMOFs@Alg-CS cubic hybrid beads on fluoride was majorly attributed by electrostatic interaction, ion-exchange and complexation mechanism. To include detail insight into adsorption route; the kinetics, thermodynamic and isotherm studies were investigated for fluoride adsorption. The equilibrium data of HT-CeMOFs@Alg-CS cubic hybrid beads for fluoride adsorption was fitted with Langmuir isotherm model. Thermodynamic investigation results demonstrated that the fluoride adsorption was spontaneous with endothermic nature. The regeneration and field investigation results revealed that the developed HT-CeMOFs@Alg-CS cubic hybrid beads are reusable and more apt at field environment.
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Affiliation(s)
- Antonysamy Jeyaseelan
- Department of Chemistry, Anna University, University College of Engineering, Dindigul, Reddiyarchatram, Dindigul 624 622, Tamilnadu, India
| | - Natrayasamy Viswanathan
- Department of Chemistry, Anna University, University College of Engineering, Dindigul, Reddiyarchatram, Dindigul 624 622, Tamilnadu, India.
| | - Ilango Aswin Kumar
- Faculty of Civil Engineering, Department of Landscape and Water Conservation, Czech Technical University in Prague, Thakurova 7, 166 29 Prague 6, Czech Republic
| | - Mu Naushad
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
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Akdağ S, Sadeghi Rad T, Keyikoğlu R, Orooji Y, Yoon Y, Khataee A. Peroxydisulfate-assisted sonocatalytic degradation of metribuzin by La-doped ZnFe layered double hydroxide. Ultrason Sonochem 2022; 91:106236. [PMID: 36442410 PMCID: PMC9709225 DOI: 10.1016/j.ultsonch.2022.106236] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 11/14/2022] [Accepted: 11/21/2022] [Indexed: 05/12/2023]
Abstract
Metribuzin is an herbicide that easily contaminates ground and surface water. Herein, La-doped ZnFe layered double hydroxide (LDH) was synthesized for the first time and used for the degradation of metribuzin via ultrasonic (US) assisted peroxydisulfate (PDS) activation. The synthesized LDH had a lamellar structure, an average thickness of 26 nm, and showed mesoporous characteristics, including specific surface area 110.93 m2 g-1, pore volume 0.27 cm3 g-1, and pore diameter 9.67 nm. The degradation efficiency of the US/La-doped ZnFe LDH/PDS process (79.1 %) was much greater than those of the sole processes, and the synergy factor was calculated as 3.73. The impact of the reactive species on the sonocatalytic process was evaluated using different scavengers. After four consecutive cycles, 10.8 % loss occurred in the sonocatalytic activity of the La-doped LDH. Moreover, the efficiency of the US/La-doped LDH/PDS process was studied with respect to the degradation of metribuzin in a wastewater matrix. According to GC-MS analysis, six by-products were detected during the degradation of metribuzin. Our results indicate that the US/La-doped ZnFe LDH/PDS process has great potential for efficient degradation of metribuzin-contaminated water and wastewater.
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Affiliation(s)
- Sultan Akdağ
- Department of Environmental Engineering, Faculty of Engineering, Gebze Technical University, 41400 Gebze, Turkey
| | - Tannaz Sadeghi Rad
- Department of Environmental Engineering, Faculty of Engineering, Gebze Technical University, 41400 Gebze, Turkey
| | - Ramazan Keyikoğlu
- Department of Environmental Engineering, Faculty of Engineering, Gebze Technical University, 41400 Gebze, Turkey; Department of Environmental Engineering, Faculty of Engineering and Natural Sciences, Bursa Technical University, 16310 Bursa, Turkey
| | - Yasin Orooji
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China
| | - Yeojoon Yoon
- Department of Environmental and Energy Engineering, Yonsei University, Wonju, South Korea.
| | - Alireza Khataee
- Department of Environmental Engineering, Faculty of Engineering, Gebze Technical University, 41400 Gebze, Turkey; Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471 Tabriz, Iran.
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Keyikoğlu R, Doğan IN, Khataee A, Orooji Y, Kobya M, Yoon Y. Synthesis of visible light responsive ZnCoFe layered double hydroxide towards enhanced photocatalytic activity in water treatment. Chemosphere 2022; 309:136534. [PMID: 36210593 DOI: 10.1016/j.chemosphere.2022.136534] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 09/05/2022] [Accepted: 09/15/2022] [Indexed: 06/16/2023]
Abstract
In this study, a ternary layered double hydroxide containing Zn, Co, and Fe transition metals (ZnCoFe LDH) was developed using a co-precipitation procedure. The as-synthesized photocatalyst was evaluated for its performance in the degradation of methylene blue (MB) under visible light irradiation. The effects of various process conditions including photocatalyst dosage, pollutant concentration, pH, lamp distance, and lamp power were investigated. The ZnCoFe LDH achieved approximately 74% photodegradation efficiency owing to the narrow bandgap of 2.14 eV. The Langmuir-Hinselwood rate constants were calculated as 1.17 min-1 and 3.55 min-1 for photolysis by LED lamp alone and for photocatalysis by LED/ZnCoFe LDH, respectively. The photocatalytic ability of the LDH was attributed to the generation of radical species like •OH and O2•-. The photocatalytic degradation intermediates of MB were determined by GC-MS analysis. The catalyst retained its performance throughout seven reuse cycles with only a 4.17% reduction in removal efficiency. The energy per order EEO of the ZnCoFe/LED process in 180 min treatment time was determined as 5.41 kWh.m-3. order-1. This study shows that ZnCoFe LDH has sufficient activity and photostability for long-term application in photocatalytic water treatment.
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Affiliation(s)
- Ramazan Keyikoğlu
- Department of Environmental Engineering, Faculty of Engineering, Gebze Technical University, 41400, Gebze, Turkey; Department of Environmental Engineering, Faculty of Engineering and Natural Sciences, Bursa Technical University, 16310, Bursa, Turkey
| | - Irmak Naz Doğan
- Department of Environmental Engineering, Faculty of Engineering, Gebze Technical University, 41400, Gebze, Turkey
| | - Alireza Khataee
- Department of Environmental Engineering, Faculty of Engineering, Gebze Technical University, 41400, Gebze, Turkey; Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471, Tabriz, Iran.
| | - Yasin Orooji
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China.
| | - Mehmet Kobya
- Department of Environmental Engineering, Faculty of Engineering, Gebze Technical University, 41400, Gebze, Turkey; Department of Environmental Engineering, Kyrgyz-Turkish Manas University, 720038, Bishkek, Kyrgyzstan
| | - Yeojoon Yoon
- Department of Environmental and Energy Engineering, Yonsei University, Wonju, Republic of Korea.
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Tan X, Zhang Y, Liu M, Cao J, Duan G, Cui J, Lin A. Ultrasonic-assisted preparation of interlaced layered hydrotalcite (U-Fe/Al-LDH) for high-efficiency removal of Cr(VI): Enhancing adsorption-coupled reduction capacity and stability. Chemosphere 2022; 308:136472. [PMID: 36122742 DOI: 10.1016/j.chemosphere.2022.136472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 09/09/2022] [Accepted: 09/12/2022] [Indexed: 06/15/2023]
Abstract
Cr(VI) contamination in aquatic systems has been a challenge for environmental science researchers. To environmental-friendly, stable, and efficiently remove Cr (VI), a novel layered double hydroxide was prepared through the ultrasonic-assisted co-precipitation method. The ultrasonic-assisted step prevented the Fe2+ oxidation, improved the morphology and performance, and finally, the adsorption-coupled reduction capacity and stability were enhanced. By adding U-Fe/Al-LDH (1.0 g/L) for Cr(VI) (100 mg/L), the removal rate reached 82.24%. The removal data were well fitted by the pseudo-second-order kinetic and Langmuir isotherm model. Using U-Fe/Al-LDH can be performed over a wide pH range (2-10), with a theoretical maximum removal capacity of 118.65 mg/g. The Cr(VI) with high toxicity was adsorbed and reduced to low-toxicity Cr(III). In the final phase, stable Cr(III) complex precipitates were generated. After 30 days, the dynamic leaching amounts of total Cr in used U-Fe/Al-LDH-2 were 0.1052 mg/L. Combined with the results of the influence experiment of coexisting anions and oxidants and the SO42- release experiment, the stability of the removal effect and the safety of U-Fe/Al-LDH were proved. In conclusion, U-Fe/Al-LDH-2 is a promising remediation agent and a feasible Cr(VI) removal method for the practical remediation.
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Affiliation(s)
- Xiao Tan
- College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Yinjie Zhang
- College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Meng Liu
- College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Jinman Cao
- College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Guilan Duan
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100029, People's Republic of China
| | - Jun Cui
- College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Aijun Lin
- College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China.
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Kumari S, Sharma A, Kumar S, Thakur A, Thakur R, Bhatia SK, Sharma AK. Multifaceted potential applicability of hydrotalcite-type anionic clays from green chemistry to environmental sustainability. Chemosphere 2022; 306:135464. [PMID: 35760140 DOI: 10.1016/j.chemosphere.2022.135464] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 06/04/2022] [Accepted: 06/21/2022] [Indexed: 06/15/2023]
Abstract
Hydrotalcite-like anionic clays (HTs) also known as Layered double hydroxides (LDHs) have been developed as multifunctional materials in numerous applications related to catalysis, adsorption, and ion-exchange processes. These materials constitute an important class of ionic lamellar solid clays of Brucite-like structure which comprise of consecutive layers of divalent and trivalent metal cations with charge balancing anions and water molecules in interlayer space. These materials have received increasing attention in research due to their interesting properties namely layered structure, ease of preparation, flexible tunability, ability to intercalate different types of anions, electronic properties, high thermal stability, high biocompatibility, and easy biodegradation. Moreover, HTs/LDHs have unique tailorable and tuneable characteristics such as both acidic and basic sites, anion exchange capability, surface area, basal spacing, memory effect, and also exhibit high exchange capacities, which makes them versatile materials for a wide range of applications and extended their horizons to diverse areas of science and technology. This study enlightens the various rational researches related to the synthetic methods and features focusing on synthesis and/or fabrication with other hybrids and their applications. The diverse applications (namely catalyst, adsorbent to toxic chemicals, agrochemicals management, non-toxic flame retardants, and recycling of plastics) of these multifunctional materials related to a clean and sustainable environment were also summarized.
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Affiliation(s)
- Sonika Kumari
- Department of Chemistry, Career Point University, Tikker - Kharwarian, Hamirpur, Himachal Pradesh, 176041, India
| | - Ajay Sharma
- Department of Chemistry, Career Point University, Tikker - Kharwarian, Hamirpur, Himachal Pradesh, 176041, India.
| | - Satish Kumar
- Department of Food Science and Technology, Dr. YS Parmar University of Horticulture and Forestry, Nauni, Solan, Himachal Pradesh, 173230, India
| | - Abhinay Thakur
- Department of Zoology, DAV College, Jalandhar, Punjab, 144008, India
| | - Ramesh Thakur
- Department of Chemistry, Himachal Pradesh University, Summer Hill, Shimla, Himachal Pradesh, 171005, India
| | - Shashi Kant Bhatia
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul, 05029, Republic of Korea.
| | - Anil Kumar Sharma
- Department of Biotechnology, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, 133207, India.
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12
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Zhang K, Wang MX, Zeng HY, Li Z. Ag-Ag 2O decorated multi-walled carbon nanotubes/NiCoAl hydrotalcite sensor for trace nitrite quantification. Mikrochim Acta 2022; 189:411. [PMID: 36214929 DOI: 10.1007/s00604-022-05513-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Accepted: 09/24/2022] [Indexed: 11/25/2022]
Abstract
Ag-Ag2O-decorated multiwall carbon nanotube/NiCoAl-hydrotalcite (CNT/LDH-Ag) composites were designed and synthesized for nitrite quantification. The materials were characterized by various techniques, and their electrochemical NO2- detection performances investigated using amperometric and differential pulse voltammetry (DPV) techniques. The Ag-Ag2O nanoparticles (NPs) were anchored on the surface of the CNT/LDH-Ag composites. At a suitable amount of the Ag-Ag2O loading, the Ag-Ag2O NPs with small particle size were distributed evenly on the CNT/LDH surface, increasing the surface area of the composites. The optimal CNT/LDH-Ag3 composite exhibited a high electrochemical activity for NO2- oxidation in pH 7.0. Furthermore, the optimal CNT/LDH-Ag3 composite was fabricated for trace NO2- quantification. The proposed sensor displayed a high sensitivity (0.0960 μA·μM-1·cm-2) and fast response (< 3 s) toward NO2- in a wide linear range from 0.250 μmol·L-1 to 4.00 mmol·L-1 with a low detection limit of 0.0590 μmol·L-1(S/N = 3). The sensor provided an outstanding analytical performance with a desirable recovery (95.3 ~ 107%, RSD < 1.05%) in real sample. As a result, the proposed sensor can be used for the real-time quantification of trace NO2- in the biological, food, and environmental fields.
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Affiliation(s)
- Kai Zhang
- College of Chemical Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China
| | - Ming-Xin Wang
- College of Chemical Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China
| | - Hong-Yan Zeng
- College of Chemical Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China.
| | - Zhen Li
- College of Chemical Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China
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13
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Lyu Y, Lyu G, Li Y, Li B, Chen K, Song C, Li Z, Pan S. Effects of substituting iron for aluminum on the low-temperature catalytic activity and sulfur resistance of hydrotalcite-derived LNT catalysts. Chemosphere 2022; 304:135200. [PMID: 35667506 DOI: 10.1016/j.chemosphere.2022.135200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 05/12/2022] [Accepted: 05/31/2022] [Indexed: 06/15/2023]
Abstract
The storage and reduction of NOx on a series of Fe-modified hydrotalcite-based lean NOx trap catalysts were assessed, together with the product selectivity. The crystal structures and micromorphologies of these materials were characterized using X-ray diffraction and scanning electron microscopy, while in situ diffuse reflectance Fourier transform infrared spectroscopy was used to evaluate the evolution of transition state species. The introduction of Fe was found to improve the synergistic interaction between the Mg and Fe in the hydrotalcite structure, allowing these catalysts to work efficiently at low temperatures. In addition, both Pt/BaO/MgAlO and Pt/BaO/MgFeO catalysts exhibited better NOx adsorption and reduction performance compared with Pt/BaO/Al2O3. The superior performance of the former two materials was attributed to the enhanced adsorption of NOx in the form of nitrates and nitrites by Fe and Mg and to the ready decomposition of these nitrates at low temperatures. A Pt/BaO/MgFeO catalyst showed excellent low temperature activity and high selectivity for N2 together with superior sulfur resistance compared with Pt/BaO/Al2O3.
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Affiliation(s)
- Yu Lyu
- State Key Laboratory of Engines, Tianjin University, Tianjin, 300072, China
| | - Gang Lyu
- State Key Laboratory of Engines, Tianjin University, Tianjin, 300072, China.
| | - Yunqing Li
- State Key Laboratory of Engines, Tianjin University, Tianjin, 300072, China
| | - Bo Li
- State Key Laboratory of Engines, Tianjin University, Tianjin, 300072, China
| | - Ke Chen
- State Key Laboratory of Engines, Tianjin University, Tianjin, 300072, China
| | - Chonglin Song
- State Key Laboratory of Engines, Tianjin University, Tianjin, 300072, China
| | - Zhenguo Li
- National Engineering Laboratory for Mobile Source Emission Control Technology, China Automotive Technology & Research Center, Tianjin, 300300, China
| | - Suozhu Pan
- Key Laboratory of Fluid and Power Machinery, Xihua University, Chengdu, 610039, China
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Nehdi A, Frini-Srasra N, de Miguel G, Pavlovic I, Sánchez L. Use of LDH- chromate adsorption co-product as an air purification photocatalyst. Chemosphere 2022; 286:131812. [PMID: 34375829 DOI: 10.1016/j.chemosphere.2021.131812] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 06/07/2021] [Accepted: 08/04/2021] [Indexed: 06/13/2023]
Abstract
This work deals with the use of layered double hydroxides for a double environmental remediation. The residue obtained in the use of these materials as a chromate sorbent in water, was subsequently studied as a photocatalyst for the removal of NOx gases. With this aim, MgAl-CO3 layered double hydroxides were synthesized by the coprecipitation method with a divalent/trivalent metal ratio of 3. After its calcination at 500 °C, the mixed oxide was obtained and MgAl-CrO4 were synthesized by the reconstruction method. A complete chemical, morphological and photochemical study of the samples was carried out with techniques such as XRD, FT-IR, TGA, XRF, PL, DRIFTS and UV-Vis spectroscopy. Results showed that LDH materials presented no significant changes in their structure after their use as a sorbent. Photocatalytic tests of the samples showed a very good NO removal efficiency, as well as a high selectivity (low NO2 emissions) through complete oxidation of these oxides to nitrate. The incorporation of chromate into the LDH structure improved the absorption of light in the visible region of the spectra, producing an improvement of 20% in the NO elimination compared with the LDH without chromate.
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Affiliation(s)
- A Nehdi
- Laboratoire des Matériaux Composites et Minéraux Argileux, Centre National de Recherche en Sciences des Matériaux CNRSM, Technopôle Borj Cedria, BP 73, 8027, Soliman, Tunisia
| | - N Frini-Srasra
- Laboratoire des Matériaux Composites et Minéraux Argileux, Centre National de Recherche en Sciences des Matériaux CNRSM, Technopôle Borj Cedria, BP 73, 8027, Soliman, Tunisia; Faculty of Sciences of Tunis (FST), Manar University, Tunisia
| | - G de Miguel
- Departamento de Química Física y Termodinámica Aplicada, Instituto Universitario de Nanoquímica IUNAN, Universidad de Córdoba, Campus de Rabanales, E-14014, Córdoba, Spain
| | - I Pavlovic
- Departamento de Química Inorgánica, Instituto Universitario de Nanoquímica IUNAN, Universidad de Córdoba, Campus de Rabanales, E-14014, Córdoba, Spain.
| | - L Sánchez
- Departamento de Química Inorgánica, Instituto Universitario de Nanoquímica IUNAN, Universidad de Córdoba, Campus de Rabanales, E-14014, Córdoba, Spain
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Fragoso J, Oliva MA, Camacho L, Cruz-Yusta M, de Miguel G, Martin F, Pastor A, Pavlovic I, Sánchez L. Insight into the role of copper in the promoted photocatalytic removal of NO using Zn 2-xCu xCr-CO 3 layered double hydroxide. Chemosphere 2021; 275:130030. [PMID: 33662730 DOI: 10.1016/j.chemosphere.2021.130030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 02/16/2021] [Accepted: 02/17/2021] [Indexed: 06/12/2023]
Abstract
In this work the ability of Zn2-xCuxCr-CO3 layered double hydroxides (LDHs) as highly efficient DeNOx photocatalysts was studied. LDHs with x = 0, 0.2 and 0.4 were prepared using a coprecipitation method. The samples were characterized by different techniques such as XRD, XPS, FT-IR, ICP-MS, TG, SBET, SEM and Diffuse reflectance (DR). The increased amount of copper ions in the LDH layers gave rise to slight changes in the structure and morphology and an important variation of the optical properties of the LDHs. The prepared ZnCuCr-CO3 photocatalysts exhibited favourable conversion efficiency (51%) and an extraordinary selectivity (97%) for the photochemical NO abatement. The photochemical mechanism was elucidated from DOS, EPR, Femtosecond transient absorption and in-situ DRIFTS studies. The results suggested that the presence of Cu2+ ions in the LDH framework introduced new states in the valence band states, thus favouring the production and mobility of e-/h+ charge carriers and a greater production of ⋅O2- and ⋅OH.
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Affiliation(s)
- J Fragoso
- Departamento de Química Inorgánica e Ingeniería Química, Instituto Universitario de Nanoquímica IUNAN, Universidad de Córdoba, Campus de Rabanales, E-14014, Córdoba, Spain
| | - M A Oliva
- Departamento de Química Inorgánica e Ingeniería Química, Instituto Universitario de Nanoquímica IUNAN, Universidad de Córdoba, Campus de Rabanales, E-14014, Córdoba, Spain
| | - L Camacho
- Departamento de Química Física y Termodinámica Aplicada, Instituto Universitario de Nanoquímica IUNAN, Universidad de Córdoba, Campus de Rabanales, E-14014, Córdoba, Spain
| | - M Cruz-Yusta
- Departamento de Química Inorgánica e Ingeniería Química, Instituto Universitario de Nanoquímica IUNAN, Universidad de Córdoba, Campus de Rabanales, E-14014, Córdoba, Spain
| | - G de Miguel
- Departamento de Química Física y Termodinámica Aplicada, Instituto Universitario de Nanoquímica IUNAN, Universidad de Córdoba, Campus de Rabanales, E-14014, Córdoba, Spain
| | - F Martin
- Departamento de Ingeniería Química, Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos, E-29071, Málaga, Spain
| | - A Pastor
- Departamento de Química Inorgánica e Ingeniería Química, Instituto Universitario de Nanoquímica IUNAN, Universidad de Córdoba, Campus de Rabanales, E-14014, Córdoba, Spain
| | - I Pavlovic
- Departamento de Química Inorgánica e Ingeniería Química, Instituto Universitario de Nanoquímica IUNAN, Universidad de Córdoba, Campus de Rabanales, E-14014, Córdoba, Spain.
| | - L Sánchez
- Departamento de Química Inorgánica e Ingeniería Química, Instituto Universitario de Nanoquímica IUNAN, Universidad de Córdoba, Campus de Rabanales, E-14014, Córdoba, Spain.
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16
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Wang M, Akamatsu H, Dabo I, Sasaki K. Environmental impact of amino acids on the release of selenate immobilized in hydrotalcite: Integrated interpretation of experimental and density-functional theory study. Chemosphere 2021; 274:129927. [PMID: 33979939 DOI: 10.1016/j.chemosphere.2021.129927] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 01/26/2021] [Accepted: 02/07/2021] [Indexed: 06/12/2023]
Abstract
The environmental impact of amino acids on the release of SeO42- immobilized into hydrotalcite (Mg2Al-LDH) which belongs to the layered double hydroxides (LDHs) family was investigated by experimental study and the observed layer structure of hydrotalcite was verified through density-functional theory (DFT) calculations. Glycine, l-cysteine, and l-aspartic acid, which have smaller molecular sizes, can release SeO42- largely due to intercalation, unstabilization of Mg2Al-LDH and simple dissolution, while l-tryptophan and l-phenylalanine caused limited SeO42- release due to their larger sizes and aromaticity. XRD patterns for the solid residues after intercalation of amino acids revealed that the layer distance of Mg2Al-LDH was partially expanded. The main peaks and shoulder features corresponding to d003 diffraction were well explained by DFT simulations using glycine as a model: the layer spacing of the main peak is responsible for the remaining SeO42- and singly stacked glycine molecule and the layer spacing of the shoulder peak was well explained by doubly stacked glycine molecules. Hydrogen bonds between amino acids and hydroxyl ions in the metallic layers of Mg2Al-LDH were responsible for the stable configuration of the intercalated Mg2Al-LDH. This study indicates potential limitations to the stability of low-level radioactive wastes of 79Se in repositories which are affected by smaller molecules of amino acids released through degradation of organic matters in the pedosphere.
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Affiliation(s)
- Mengmeng Wang
- Department of Earth Resources Engineering, Kyushu University, Fukuoka, 819-0395, Japan.
| | - Hirofumi Akamatsu
- Department of Applied Chemistry, Kyushu University, Fukuoka, 819-0395, Japan.
| | - Ismaila Dabo
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, 16802, United States.
| | - Keiko Sasaki
- Department of Earth Resources Engineering, Kyushu University, Fukuoka, 819-0395, Japan.
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17
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Park M, Kim S, Han YS, Hyun SP, Jeong HY. Thermal effect on the leachability of extraframework Co 2+ in zeolite X. Chemosphere 2021; 264:128479. [PMID: 33032209 DOI: 10.1016/j.chemosphere.2020.128479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 09/09/2020] [Accepted: 09/27/2020] [Indexed: 06/11/2023]
Abstract
A partially Co2+-exchanged zeolite X was thermally treated to simulate the effect of decay heat on the leachability of extraframework Co2+. To have a mechanistic insight into thermal effect, X-ray diffraction, scanning electron microscopy, 27Al magic angle spinning nuclear magnetic resonance spectroscopy, and Co K-edge X-ray absorption spectroscopy were employed with leaching tests. Although thermal treatment at ≤ 600 °C did not lead to the collapse of zeolite framework, it removed H2O molecules from the coordination shell of extraframework Co2+, which in turn changed its coordination structure in a way to strengthen the interaction between Co2+ and the lattice oxygens. In leaching tests, the sample treated at higher temperature for a longer period showed less remobilized Co2+ by forming a Co(OH)2-like surface precipitate and a Co hydrotalcite-like phase. Notably, the formation of the latter phase indicated the abstraction of the framework Al, the extent of which increased with the treatment temperature and duration. Two mechanisms, the concurrent extraction of Al with Co2+ remobilization and the hydrolysis-promoted Al abstraction, were proposed to account for thermally promoted dealumination. This study suggests that the exposure of Co2+-exchanged zeolite X to decay heat lessen the risk of extraframework Co2+ to be reintroduced into groundwater.
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Affiliation(s)
- Minji Park
- Department of Geological Sciences, Pusan National University, Busan, 46241, South Korea
| | - Sookyung Kim
- Department of Geological Sciences, Pusan National University, Busan, 46241, South Korea
| | - Young-Soo Han
- Department of Environmental Engineering, Chungnam National University, Daejeon, 34134, South Korea
| | - Sung Pil Hyun
- Geology Division, Korea Institute of Geoscience and Mineral Resources, Deajeon, 34132, South Korea
| | - Hoon Young Jeong
- Department of Geological Sciences, Pusan National University, Busan, 46241, South Korea.
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Tian X, Zhu J, Tang M, Wang D, Nie Y, Yang L, Dai C, Yang C, Lu L. Surface acidity and basicity of Mg/Al hydrotalcite for 2, 4-dichlorophenoxyacetic acid degradation with ozone: Mineralization, mechanism, and implications to practical water treatment. J Hazard Mater 2021; 402:123475. [PMID: 32707464 DOI: 10.1016/j.jhazmat.2020.123475] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Revised: 06/19/2020] [Accepted: 07/10/2020] [Indexed: 06/11/2023]
Abstract
The Mg/Al hydrotalcite (Mg/Al HT) was firstly used as a heterogeneous ozonation catalyst and 2,4-dichlorophenoxyacetic acid (2,4-D) was efficiently degraded by Mg3/Al HT with a COD removal of 68 %. It was higher than that of α-FeOOH with a COD removal of 50 %. The effects of Mg/Al atomic ratio, phosphate and pyrrole on the ozonation performance of Mg/Al HTs were also investigated. The X-ray photoelectron spectroscopy (XPS), nitrogen adsorption-desorption experiment and temperature programmed desorption of adsorbed CO2 or NH3 were used to characterize the surface properties of Mg/Al HT. The surface acidity and basity was proven to be responsible to the excellent ozonation activity of Mg/Al HT. The results of electron spin resonance (ESR) analysis and probe experiments confirmed that OH, O2- and 1O2 were involved in the 2,4-D degradation process and their contributions are as followed: OH > O2- > 1O2. The synergistic effect of surface acid (ozone adsorption center) and base sites (catalytic center) determines Mg/Al HT in the enhanced catalytic ozone decomposition into reactive species. More important, the transition metal free based Mg/Al HTs is steady, non-toxic, naturally abundant and environment friendly, which provided a promising alternative in practical water treatment by catalytic ozonation.
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Affiliation(s)
- Xike Tian
- Faculty of Materials and Chemistry, China University of Geosciences, Wuhan, 430074, PR China
| | - Jialu Zhu
- Faculty of Materials and Chemistry, China University of Geosciences, Wuhan, 430074, PR China
| | - Min Tang
- Faculty of Materials and Chemistry, China University of Geosciences, Wuhan, 430074, PR China
| | - Dan Wang
- Hubei Selenium Industrial Research Institute, Hubei Institute of Geosciences, Wuhan, 430034, PR China
| | - Yulun Nie
- Faculty of Materials and Chemistry, China University of Geosciences, Wuhan, 430074, PR China.
| | - Liangzhe Yang
- Hubei Selenium Industrial Research Institute, Hubei Institute of Geosciences, Wuhan, 430034, PR China
| | - Chu Dai
- Faculty of Materials and Chemistry, China University of Geosciences, Wuhan, 430074, PR China
| | - Chao Yang
- Faculty of Materials and Chemistry, China University of Geosciences, Wuhan, 430074, PR China
| | - Liqiang Lu
- Faculty of Materials and Chemistry, China University of Geosciences, Wuhan, 430074, PR China
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Jacquet S, Monnin C, Herlory O, Mille D, Dufour A, Oursel B, Heimbürger-Boavida LE, D'onofrio S, Layglon N, Garnier C. Characterization of the submarine disposal of a Bayer effluent (Gardanne alumina plant, southern France): I. Size distribution, chemical composition and settling rate of particles forming at the outfall. Chemosphere 2021; 263:127695. [PMID: 32818848 DOI: 10.1016/j.chemosphere.2020.127695] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 07/08/2020] [Accepted: 07/12/2020] [Indexed: 06/11/2023]
Abstract
The submarine discharge of the high pH clarified Bayer effluent of the Gardanne alumina plant (Marseille region, France) leads to the formation of concretions at the outfall 324 m underwater and to a plume of white particles. The bulk chemical composition of the concretions has been determined by SF-ICP-MS. Mg and Al are the major elements measured with concentrations of a few hundred mg g-1. Ca and S are also found at concentrations in the range of mg g-1. Among the measured trace elements there is a specific interest in As and V because of environmental concerns pointed out by regulation authorities. Their concentrations are of tens to thousands μg g-1, respectively. Concentrations of the other elements are in the range of a few ng g-1 to few hundreds μg g-1. In order to constrain the dispersion of particles in the environment and to understand how chemical elements can be scavenged from or released to seawater, the size distribution of particles composing the concretions has been measured by settling rate experiments and, for each size class of particles, their chemical composition has been determined. For example, As and V are mainly associated to particles with mean diameters between 15.6 and 63 μm and settling rates around 96 m d-1. Overall, all the main elements (Mg, Al, Ca, S) composing concretions are associated to this size class of particles which represents 53-60% of the total concretion mass.
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Affiliation(s)
- Stéphanie Jacquet
- Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 13288, Marseille, France.
| | - Christophe Monnin
- Geosciences Environnement Toulouse, CNRS - Université Paul Sabatier - IRD (Observatoire Midi-Pyrénées), 14 Avenue Edouard Belin, 31400, Toulouse, France
| | - Olivier Herlory
- CREOCEAN, Valparc - Bât B, 230 Avenue de Rome, 83500, La Seyne sur Mer, France
| | - Deborah Mille
- CREOCEAN, Valparc - Bât B, 230 Avenue de Rome, 83500, La Seyne sur Mer, France
| | - Aurélie Dufour
- Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 13288, Marseille, France
| | - Benjamin Oursel
- Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 13288, Marseille, France
| | - Lars-Eric Heimbürger-Boavida
- Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 13288, Marseille, France
| | - Sébastien D'onofrio
- Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 13288, Marseille, France
| | - Nicolas Layglon
- Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 13288, Marseille, France
| | - Cédric Garnier
- Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 13288, Marseille, France
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Ameena Shirin VK, Sankar R, Johnson AP, Gangadharappa HV, Pramod K. Advanced drug delivery applications of layered double hydroxide. J Control Release 2020; 330:398-426. [PMID: 33383094 DOI: 10.1016/j.jconrel.2020.12.041] [Citation(s) in RCA: 67] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Revised: 12/22/2020] [Accepted: 12/23/2020] [Indexed: 01/09/2023]
Abstract
Layered double hydroxides (LDHs), also known as anionic clays or hydrotalcite-like compounds, are a class of nanomaterials that attained great attention as a carrier for drug delivery applications. The lamellar structure of this compound exhibits a high surface-to-volume ratio which enables the intercalation of therapeutic agents and releases them at the target site, thereby reducing the adverse effect. Moreover, the intercalated drug can be released in a sustained manner, and hence the frequency of drug administration can be decreased. The co-precipitation, ion exchange, manual grinding, and sol-gel methods are the most employed for their synthesis. The unique properties like the ease of synthesis, low cost, high biocompatibility, and low toxicity render them suitable for biomedical applications. This review presents the advances in the structure, properties, method of preparation, types, functionalization, and drug delivery applications of LDH. Also, this review provides various new conceptual insights that can form the basis for new research questions related to the drug delivery applications of LDH.
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Affiliation(s)
- V K Ameena Shirin
- College of Pharmaceutical Sciences, Government Medical College, Kozhikode 673008, Kerala, India
| | - Renu Sankar
- College of Pharmaceutical Sciences, Government Medical College, Kozhikode 673008, Kerala, India
| | - Asha P Johnson
- Department of Pharmaceutics, JSS College of Pharmacy, JSS Academy of Higher Education and Research, Sri Shivarathreeshwara Nagara, Bannimantap, Mysuru 570015, Karnataka, India
| | - H V Gangadharappa
- Department of Pharmaceutics, JSS College of Pharmacy, JSS Academy of Higher Education and Research, Sri Shivarathreeshwara Nagara, Bannimantap, Mysuru 570015, Karnataka, India.
| | - K Pramod
- College of Pharmaceutical Sciences, Government Medical College, Kozhikode 673008, Kerala, India.
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Yan Q, Hou X, Liu G, Li Y, Zhu T, Xin Y, Wang Q. Recent advances in layered double hydroxides (LDHs) derived catalysts for selective catalytic reduction of NO x with NH 3. J Hazard Mater 2020; 400:123260. [PMID: 32947694 DOI: 10.1016/j.jhazmat.2020.123260] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 06/16/2020] [Accepted: 06/18/2020] [Indexed: 06/11/2023]
Abstract
In recent years, layered double hydroxides (LDHs) derived metal oxides as highly efficient catalysts for selective catalytic reduction of NOx with NH3 (NH3-SCR) have attracted great attention. The high dispersibility and interchangeability of cations within the brucite-like layers make LDHs an indispensable branch of catalytic materials. With the increasingly stringent and ultra-low emission regulations, there is an urgent need for highly efficient and stable low-medium temperature denitration catalysts in markets. In this contribution, we have critically summarized the recent research progress in the LDHs derived NH3-SCR catalysts, including their ability for NOx removal, N2 selectivity, active temperature window, stability and resistance to poisoning. The advantages and defects of various types of LDHs-derived catalysts are comparatively summarized, and the corresponding modification strategies are discussed. In addition, considering the importance of the catalyst's resistance to poisoning in practical applications, we discuss the poisoning mechanism of each component in flue gases, and provide the corresponding strategies to improve the poisoning resistance of catalysts. Finally, from the perspective of practical applications and operation cost, the regeneration measures of catalysts after poisoning is also discussed. We hope that this work can give timely technical guidance and valuable insights for the applications of LDHs materials in the field of NOx control.
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Affiliation(s)
- Qinghua Yan
- Qingdao Engineering Research Center for Rural Environment, College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China
| | - Xiangting Hou
- Qingdao Engineering Research Center for Rural Environment, College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China
| | - Guocheng Liu
- Qingdao Engineering Research Center for Rural Environment, College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China
| | - Yuran Li
- Research Center for Process Pollution Control, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Tingyu Zhu
- Research Center for Process Pollution Control, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Yanjun Xin
- Qingdao Engineering Research Center for Rural Environment, College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China.
| | - Qiang Wang
- College of Environmental Science and Engineering, Beijing Forestry University, 35 Qinghua East Road, Haidian District, Beijing 100083, PR China.
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22
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Poolachira S, Velmurugan S. Exfoliated hydrotalcite-modified polyethersulfone-based nanofiltration membranes for removal of lead from aqueous solutions. Environ Sci Pollut Res Int 2020; 27:29725-29736. [PMID: 31745790 DOI: 10.1007/s11356-019-06715-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Accepted: 10/07/2019] [Indexed: 06/10/2023]
Abstract
In recent years, the volume of wastewater produced worldwide has led to an increase in the study and use of different membranes and their properties. The progress of membrane technology in hand with nanotechnology has brought to the establishment of advanced membrane materials that are effective in the field of wastewater treatment and water reclamation. This study focuses on the effectiveness of exfoliated hydrotalcite (EHT) nanosheets in the membrane structure which has been evaluated by water flux and heavy metal rejection studies from aqueous solutions. Moreover, the shedding of HT in an organic polar solvent provides a new type of 2-D nanosheet with higher positive charge density. Hydrophilicity, porosity, surface and cross-section morphology, functional groups, and mechanical strength are determined to characterize the prepared membranes. The effect of adding a pore-forming agent to the dope solution is also investigated. Increased hydrophilicity of the modified membranes is confirmed by water contact angle measurement. Furthermore, EHT is found to be an efficient inorganic additive to get better membrane performance and can be employed as a promising candidate for the removal of Pb2+. The rejection % enhanced substantially (50.2% as compared with 29.5% for PES membrane) with increased loading of EHT up to 0.5 g.
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Affiliation(s)
- Sinu Poolachira
- Department of Chemical Engineering, National Institute of Technology Calicut, Kozhikode, 673601, India
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23
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Zhou Y, Liu Z, Bo A, Tana T, Liu X, Zhao F, Sarina S, Jia M, Yang C, Gu Y, Zheng H, Zhu H. Simultaneous removal of cationic and anionic heavy metal contaminants from electroplating effluent by hydrotalcite adsorbent with disulfide (S 2-) intercalation. J Hazard Mater 2020; 382:121111. [PMID: 31563089 DOI: 10.1016/j.jhazmat.2019.121111] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Revised: 08/14/2019] [Accepted: 08/27/2019] [Indexed: 06/10/2023]
Abstract
Hydrotalcite materials are generally utilized for anionic pollutants due to its interlayered anion exchange ability. Their potentiality for cationic contaminants is rarely explored. In this study, disulfide (S2-) intercalated LDH material demonstrated capability to remove both heavy metal cations and oxyanions simultaneously from water. The S2- intercalation of LDH significantly improved its adsorption capability towards both heavy metal cations (Co2+ and Ni2+) and oxyanion (CrO42-). The adsorption amount of S-LDH towards Co2+ and Ni2+ reached 88.6mg/g and 76.2mg/g, which are 405% and 281% higher than that of pristine LDH. For CrO42- removal, the adsorption amount reached 34.7mg/g, 402% higher than that of pristine LDH. The cations capture mechanism mainly depends on the novel layer sheet cation substitution mechanism based on irreversible precipitation and the generation of metal sulfide precipitates. Meanwhile, the interlayered S2- can be easily replaced by CrO42- to realize the simultaneous removal of both heavy metal cations and oxyanions. In the fixed-bed column experiments, 448 bed volume (BV) (672 mL) of simulating electroplating wastewater can be efficiently treated by yielding only 1 BV(15 mL) of chemical sludge, which is practically acceptable. This work provided a highly practical adsorption technology based on the S2- modification hydrotalcite material for the purification of heavy metal ions contaminated wastewater.
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Affiliation(s)
- Yuhao Zhou
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China; State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China; School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD, 4001, Australia
| | - Zhe Liu
- School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD, 4001, Australia
| | - Arixin Bo
- School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD, 4001, Australia
| | - Tana Tana
- School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD, 4001, Australia
| | - Xin Liu
- School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD, 4001, Australia
| | - Fu Zhao
- School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD, 4001, Australia
| | - Sarina Sarina
- School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD, 4001, Australia.
| | - Manke Jia
- College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, China; School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD, 4001, Australia
| | - Changjun Yang
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, College of Chemistry and Material Science, South-Central University For Nationalities, Wuhan 430074, China; School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD, 4001, Australia
| | - Yuantong Gu
- School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD, 4001, Australia
| | - Huaili Zheng
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China; State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China.
| | - Huaiyong Zhu
- School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD, 4001, Australia
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Chen CR, Zeng HY, Yi MY, Xiao GF, Zhu RL, Cao XJ, Shen SG, Peng JW. Fabrication of Ag 2O/Ag decorated ZnAl-layered double hydroxide with enhanced visible light photocatalytic activity for tetracycline degradation. Ecotoxicol Environ Saf 2019; 172:423-431. [PMID: 30735974 DOI: 10.1016/j.ecoenv.2019.01.080] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 01/17/2019] [Accepted: 01/19/2019] [Indexed: 06/09/2023]
Abstract
The photocatalytic performance of layered double hydroxides (LDH) is usually confined to the slow interface mobility and high recombination rate of photogenerated electron-hole pairs in material. To overcome the low photocatalytic efficiency, novel Ag2O/Ag decorated LDH (LDH-Ag2O/Ag) was successfully synthesized by depositing Ag2O on the surface of LDH and then converted to Ag° nanoparticles in the right position after heat treatment. The as-synthesized LDH-Ag2O/Ag composites were characterized by Powder X-ray diffraction (XRD), Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflectance spectra (UV-vis DRS), photoluminescence spectra (PL) and transient photocurrent (TPC) analysis. Compared with virgin LDH, the photocatalytic activities of LDH-Ag2O/Ag composites were enhanced significantly. The optimum photocatalytic efficiency of LDH-Ag10 (0.0184 min-1) was nearly 46 times higher than that of virgin LDH (0.0004 min-1). The result of active species trapping experiments indicated that •OH, h+, and •O2- have an effect on the TC degradation, where •OH played the predominant role during the photocatalytic process. The possible photocatalytic mechanisms involving the charge transfer pathway and reactive species generation during the process of TC degradation were also discussed. The improved photocatalytic activity of LDH-Ag2O/Ag could be attributed to the synergetic effect between LDH and Ag2O/Ag that extended visible light range and reduced photogenerated charge carriers recombination.
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Affiliation(s)
- Chao-Rong Chen
- College of Chemical Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China
| | - Hong-Yan Zeng
- College of Chemical Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China.
| | - Mo-Yu Yi
- College of Chemical Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China
| | - Gao-Fei Xiao
- College of Chemical Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China
| | - Run-Liang Zhu
- Key Laboratory of Mineralogy and Metallogeny, Guangdong Provincial Key Laboratory of Mineral Physics and Material Research & Development, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
| | - Xiao-Jv Cao
- College of Chemical Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China
| | - Shi-Gen Shen
- College of Chemical Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China
| | - Jia-Wen Peng
- College of Chemical Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China
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Chang PH, Jiang WT, Li Z. Removal of perfluorooctanoic acid from water using calcined hydrotalcite - A mechanistic study. J Hazard Mater 2019; 368:487-495. [PMID: 30710777 DOI: 10.1016/j.jhazmat.2019.01.084] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Revised: 12/26/2018] [Accepted: 01/23/2019] [Indexed: 06/09/2023]
Abstract
Calcined hydrotalcite (CHT) was evaluated for its potential removal of perfluorooctanoic acid (PFOA) from water in this study. The uptake of PFOA by CHT could be as high as 1587 mg/g (ca. 3.8 mmol/g), slightly larger than the anion exchange capacity (AEC) of the hydrotalcite (HT). Such a high removal was fast and pH independent, suggesting the versatile use of CHT. Due to the structural memory effect of HT, the removal involved adsorption of PFOA during HT recovery and intercalation of PFOA into the interlayer of restructured HT at low and high initial concentrations, respectively. Limited by the specific surface area and AEC, the intercalated PFOA would form a vertical bilayer or admicelle conformation. As such, the HT intercalated with PFOA became one-layer stacking with a basal spacing of 2.04 nm in contrast to the 3R polytype of recovered HT having a layer thickness of 0.78 nm, as confirmed by X-ray diffraction, thermogravimetric, and infra-red analyses. Due to its high PFOA removal capacity and large partitioning coefficient, the amount of CHT used, thus, the disposal of PFOA-laden solid could be minimized.
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Affiliation(s)
- Po-Hsiang Chang
- Department of Earth Sciences, National Cheng Kung University, 1 University Road, Tainan, 70101, Taiwan
| | - Wei-Teh Jiang
- Department of Earth Sciences, National Cheng Kung University, 1 University Road, Tainan, 70101, Taiwan.
| | - Zhaohui Li
- Department of Earth Sciences, National Cheng Kung University, 1 University Road, Tainan, 70101, Taiwan; Department of Geosciences, University of Wisconsin - Parkside, 900 Wood Road, Kenosha, WI 53144, USA.
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26
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Hsu LC, Tzou YM, Chiang PN, Fu WM, Wang MK, Teah HY, Liu YT. Adsorption mechanisms of chromate and phosphate on hydrotalcite: A combination of macroscopic and spectroscopic studies. Environ Pollut 2019; 247:180-187. [PMID: 30677662 DOI: 10.1016/j.envpol.2019.01.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Revised: 12/30/2018] [Accepted: 01/03/2019] [Indexed: 06/09/2023]
Abstract
Hydrotalcite (HT) is a layered double hydroxide (LDH), which is considered as a potential adsorbent to remove anion contaminants. In this study, adsorption of chromate (CrO4) and phosphate (PO4) on HT was conducted at various pH and temperatures. Related adsorption mechanisms were determined via the isotherm, kinetic, and competitive adsorption studies as well as the Cr K-edge X-ray absorption fine-structure (XAFS) spectroscopy. The maximum adsorption capacities for CrO4 and PO4 on HT were 0.16 and 0.23 mmol g-1. Regarding adsorption kinetics, CrO4 and PO4 adsorption on HT could be well described by the second order model, and the rate coefficient of CrO4 and PO4 on HT decreased significantly with the increasing pH from 5 to 9. The adsorption kinetics for CrO4 and PO4 were divided into fast and slow stages with the boundary at 15 min. This biphasic adsorption behavior might be partially attributed to multiple reactive pathways including anion exchange and surface complexation. Fitting results of Cr K-edge EXAFS analysis showed a direct bonding between CrO4 and Al on HT surfaces. Such a surface complexation appeared to be the rate-limiting step for CrO4 adsorption on HT. By contrast, the diffusion through the hydrated interlayer space of HT was the major rate-limiting step for PO4. This study determined the adsorption behaviors of CrO4 and PO4 on HT, including the initial transfer process and the subsequent adsorption mechanisms. Such information could improve the strategy to use HT as the potential adsorbent for the remediation of anionic pollutants.
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Affiliation(s)
- Liang-Ching Hsu
- Department of Soil and Environmental Sciences, National Chung-Hsing University, 145 Xingda Rd., Taichung 402, Taiwan
| | - Yu-Min Tzou
- Department of Soil and Environmental Sciences, National Chung-Hsing University, 145 Xingda Rd., Taichung 402, Taiwan; Innovation and Development Center of Sustainable Agriculture, National Chung-Hsing University, 145 Xingda Rd., Taichung 402, Taiwan
| | - Po-Neng Chiang
- The Experimental Forest, National Taiwan University, 12 Qianshan Rd., Nantou County 557, Taiwan
| | - Wei-Min Fu
- Department of Agricultural Chemistry, National Taiwan University, 1 Sec. 4, Roosevelt Rd., Taipei 106, Taiwan
| | - Ming-Kuang Wang
- Department of Agricultural Chemistry, National Taiwan University, 1 Sec. 4, Roosevelt Rd., Taipei 106, Taiwan
| | - Heng Yi Teah
- Waseda Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Yu-Ting Liu
- Department of Soil and Environmental Sciences, National Chung-Hsing University, 145 Xingda Rd., Taichung 402, Taiwan; Innovation and Development Center of Sustainable Agriculture, National Chung-Hsing University, 145 Xingda Rd., Taichung 402, Taiwan.
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27
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Constantino LV, Quirino JN, Abrão T, Parreira PS, Urbano A, Santos MJ. Sorption-desorption of antimony species onto calcined hydrotalcite: Surface structure and control of competitive anions. J Hazard Mater 2018; 344:649-656. [PMID: 29149765 DOI: 10.1016/j.jhazmat.2017.11.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Revised: 09/16/2017] [Accepted: 11/08/2017] [Indexed: 06/07/2023]
Abstract
Calcined hydrotalcite can be applied to remove anionic contaminants from aqueous systems such as antimony species due to its great anion exchange capacity and high surface area. Hence, this study evaluated antimonite and antimonate sorption-desorption processes onto calcined hydrotalcite in the presence of nitrate, sulfate and phosphate. Sorption and desorption experiments of antimonite and antimonate were carried out in batch equilibrium and the post-sorption solids were analyzed by X-ray fluorescence (EDXRF). Sorption data were better fitted by dual-mode Langmuir-Freundlich model (R2>0.99) and desorption data by Langmuir model. High maximum sorption capacities were found for the calcined hydrotalcite, ranging from 617 to 790meqkg-1. The competing anions strongly affected the antimony sorption. EDXRF analysis and mathematical modelling showed that sulfate and phosphate presented higher effect on antimonite and antimonate sorption, respectively. High values for sorption efficiency (SE=99%) and sorption capacity were attributed to the sorbent small particles and the large surface area. Positive hysteresis indexes and low mobilization factors (MF>3%) suggest very low desorption capacity to antimony species from LDH. These calcined hydrotalcite characteristics are desirable for sorption of antimony species from aqueous solutions.
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Affiliation(s)
- Leonel Vinicius Constantino
- Departamento de Química, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Paraná 86051-990, Brazil
| | - Juliana Nunes Quirino
- Departamento de Química, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Paraná 86051-990, Brazil
| | - Taufik Abrão
- Departamento de Engenharia Elétrica, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Paraná 86051-990, Brazil
| | - Paulo Sérgio Parreira
- Departamento de Física, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Paraná 86051-990, Brazil
| | - Alexandre Urbano
- Departamento de Física, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Paraná 86051-990, Brazil
| | - Maria Josefa Santos
- Departamento de Química, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Paraná 86051-990, Brazil.
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Xiao G, Zeng H, Xu S, Chen C, Zhao Q, Liu X. Preparation of Ti species coating hydrotalcite by chemical vapor deposition for photodegradation of azo dye. J Environ Sci (China) 2017; 60:14-23. [PMID: 29031441 DOI: 10.1016/j.jes.2017.03.031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Revised: 01/17/2017] [Accepted: 03/08/2017] [Indexed: 06/07/2023]
Abstract
TiO2 in anatase crystal phase is a very effective catalyst in the photocatalytic oxidation of organic compounds in water. To improve its photocatalytic activity, the Ti-coating MgAl hydrotalcite (Ti-MgAl-LDH) was prepared by chemical vapor deposition (CVD) method. Response surface method (RSM) was employed to evaluate the effect of Ti species coating parameters on the photocatalytic activity, which was found to be affected by the furnace temperature, N2 flow rate and influx time of precursor gas. Application of RSM successfully increased the photocatalytic efficiency of the Ti-MgAl-LDH in methylene blue photodegradation under UV irradiation, leading to improved economy of the process. According to the results from X-ray diffraction, scanning electron microscopy, Brunner-Emmet-Teller and Barrett-Joyner-Hallender, thermogravimetric and differential thermal analysis, UV-vis diffuse reflectance spectra analyses, the Ti species (TiO2 or/and Ti4+) were successfully coated on the MgAl-LDH matrix. The Ti species on the surface of the Ti-MgAl-LDH lead to a higher photocatalytic performance than commercial TiO2-P25. The results suggested that CVD method provided a new approach for the industrial preparation of Ti-coating MgAl-LDH material with good photocatalytic performances.
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Affiliation(s)
- Gaofei Xiao
- College of Chemical Engineering, Xiangtan University, Xiangtan 411105, Hunan, China.
| | - HongYan Zeng
- College of Chemical Engineering, Xiangtan University, Xiangtan 411105, Hunan, China.
| | - Sheng Xu
- College of Chemical Engineering, Xiangtan University, Xiangtan 411105, Hunan, China
| | - ChaoRong Chen
- College of Chemical Engineering, Xiangtan University, Xiangtan 411105, Hunan, China
| | - Quan Zhao
- College of Chemical Engineering, Xiangtan University, Xiangtan 411105, Hunan, China
| | - XiaoJun Liu
- College of Chemical Engineering, Xiangtan University, Xiangtan 411105, Hunan, China
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Wang L, Wang X, Li J, Feng X, Wang Y. Silica Aerogel-supported Hydrozincite and Carbonate-intercalated Hydrotalcite for High-efficiency Removal of Pb(II) Ions by Precipitation Transformation Reactions. Nanoscale Res Lett 2017; 12:549. [PMID: 28948484 PMCID: PMC5612910 DOI: 10.1186/s11671-017-2323-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Accepted: 09/19/2017] [Indexed: 06/07/2023]
Abstract
In this work, hydrozincite and Zn/Al-CO32- hydrotalcite supported on silica aerogel were prepared via a simple and economical process and used as adsorbents for Pb(II) removal. The supported hydrozincite and Zn/Al-CO32- hydrotalcite possess ultra-thin thickness, high surface area, and weak crystallinity. In the batch Pb(II) adsorption experiments, the adsorbents with higher Zn(II) contents showed higher Pb(II) adsorption capacities, and the adsorption data fitted well with the Langmuir isotherm model and pseudo-second-order kinetic model, indicating a mechanism of surface chemisorption. The adsorption capacities calculated based Langmuir isotherm model are 684.9 mg/g and 555.6 mg/g for the supported hydrozincite and Zn/Al-CO32- hydrotalcite, respectively, higher than the adsorption capacities of other hydrotalcite-based adsorbents and most of other inorganic adsorbents reported previously. The XRD diffraction peaks of hydrozincite and Zn/Al-CO32- hydrotalcite disappeared after the adsorption, and the Pb(II) species were uniformly dispersed in the adsorbents in form of Pb3(CO3)2(OH)2 proven by TEM, EDS mapping and XRD analysis, demonstrating the nature of the adsorption is the precipitation conversion of hydrozincite or Zn/Al-CO32- hydrotalcite into Pb3(CO3)2(OH)2. These results demonstrate the synergic Pb(II) removal effect of the CO32- and OH- derived from hydrozincite and Zn/Al-CO32- hydrotalcite together with their ultra-thin thickness and high surface area contribute the excellent properties of the adsorbents.
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Affiliation(s)
- Lijun Wang
- School of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing, 312000, People's Republic of China.
| | - Xiaoxia Wang
- School of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing, 312000, People's Republic of China
| | - Jianfa Li
- School of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing, 312000, People's Republic of China
| | - Xiaolan Feng
- School of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing, 312000, People's Republic of China
| | - Yusen Wang
- School of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing, 312000, People's Republic of China
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30
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Constantino LV, Quirino JN, Monteiro AM, Abrão T, Parreira PS, Urbano A, Santos MJ. Sorption-desorption of selenite and selenate on Mg-Al layered double hydroxide in competition with nitrate, sulfate and phosphate. Chemosphere 2017; 181:627-634. [PMID: 28476002 DOI: 10.1016/j.chemosphere.2017.04.071] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Revised: 04/11/2017] [Accepted: 04/16/2017] [Indexed: 06/07/2023]
Abstract
Selenate and selenite are considered emerging contaminants and pose a risk to living organisms. Since selenium anion species are at low concentration in aquatic environments, materials for its retention are required to enable monitoring. Herein, hydrotalcite was calcined and characterised to investigate sorption and desorption of selenite and selenate in competition with nitrate, sulfate and phosphate. Sorption experiments were carried out in batch system and desorption by sequential dilution. Selenite and selenate concentration remaining after N desorption steps was determined by mass balance. The isotherms were adjusted to the dual-mode Langmuir-Freundlich model (R2 > 0.99). Maximum sorption capacity ranged from 494 to 563 meq kg-1 for selenite and from 609 to 659 meq kg-1 for selenate. Sulfate and phosphate ions showed greater competitive effect on the sorption of selenate and selenite, respectively. Low mobilization factors and high sorption efficiency (MF<3%; SE ≈ 100%) indicated that calcined hydrotalcite has the wanted characteristics for retention of relevant selenium anion species in aqueous media.
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Affiliation(s)
- Leonel Vinicius Constantino
- Departamento de Química, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Paraná, 86051-990, Brazil
| | - Juliana Nunes Quirino
- Departamento de Química, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Paraná, 86051-990, Brazil
| | - Alessandra Maffei Monteiro
- Departamento de Química, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Paraná, 86051-990, Brazil
| | - Taufik Abrão
- Departamento de Engenharia Elétrica, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Paraná, 86051-990, Brazil
| | - Paulo Sérgio Parreira
- Departamento de Física, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Paraná, 86051-990, Brazil
| | - Alexandre Urbano
- Departamento de Física, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Paraná, 86051-990, Brazil
| | - Maria Josefa Santos
- Departamento de Química, Universidade Estadual de Londrina, Rod. Celso Garcia Cid-PR445, Londrina, Paraná, 86051-990, Brazil.
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Homsi D, Rached JA, Aouad S, Gennequin C, Dahdah E, Estephane J, Tidahy HL, Aboukaïs A, Abi-Aad E. Steam reforming of ethanol for hydrogen production over Cu/Co-Mg-Al-based catalysts prepared by hydrotalcite route. Environ Sci Pollut Res Int 2017; 24:9907-9913. [PMID: 27552997 DOI: 10.1007/s11356-016-7480-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 08/16/2016] [Indexed: 06/06/2023]
Abstract
The performances of different 5Cu/CoxMg6-xAl2 (x = 0; 2; 4; 6) catalysts prepared by the wet impregnation method were investigated in the ethanol steam-reforming reaction (ESR) at 450 °C during 4 h under a steam/ethanol ratio of 3 (S/E = 3). The best catalyst among the prepared solids was 5Cu/Co6Al2 as it showed a complete ethanol conversion and the highest hydrogen and carbon dioxide productivities. However, following 50 h of aging, the catalyst deactivated due to the formation of a high amount of carbonaceous products detected by differential scanning calorimetry/thermogravimetry. On the other hand, the 5Cu/Co2Mg4Al2 catalyst showed a much lower quantity of coke deposition with no deactivation due to the basic character conferred by the magnesium oxide phase.
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Affiliation(s)
- Doris Homsi
- Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV, E.A. 4492), MREI, Université du Littoral-Côte d'Opale, 145 Avenue Schumann, 59140, Dunkerque, France
- Department of Chemistry, University of Balamand, P.O. Box 100, Tripoli, Lebanon
| | - Jihane Abou Rached
- Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV, E.A. 4492), MREI, Université du Littoral-Côte d'Opale, 145 Avenue Schumann, 59140, Dunkerque, France
- Department of Chemistry, University of Balamand, P.O. Box 100, Tripoli, Lebanon
| | - Samer Aouad
- Department of Chemistry, University of Balamand, P.O. Box 100, Tripoli, Lebanon.
| | - Cédric Gennequin
- Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV, E.A. 4492), MREI, Université du Littoral-Côte d'Opale, 145 Avenue Schumann, 59140, Dunkerque, France
| | - Eliane Dahdah
- Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV, E.A. 4492), MREI, Université du Littoral-Côte d'Opale, 145 Avenue Schumann, 59140, Dunkerque, France
- Department of Chemistry, University of Balamand, P.O. Box 100, Tripoli, Lebanon
| | - Jane Estephane
- Department of Chemical Engineering, University of Balamand, P.O. Box 100, Tripoli, Lebanon
| | - Haingomalala Lucette Tidahy
- Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV, E.A. 4492), MREI, Université du Littoral-Côte d'Opale, 145 Avenue Schumann, 59140, Dunkerque, France
| | - Antoine Aboukaïs
- Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV, E.A. 4492), MREI, Université du Littoral-Côte d'Opale, 145 Avenue Schumann, 59140, Dunkerque, France
| | - Edmond Abi-Aad
- Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV, E.A. 4492), MREI, Université du Littoral-Côte d'Opale, 145 Avenue Schumann, 59140, Dunkerque, France
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Yang RQ, Mao H, Huang LY, Su PZ, Lu M. Effects of hydrotalcite combined with esomeprazole on gastric ulcer healing quality: A clinical observation study. World J Gastroenterol 2017; 23:1268-1277. [PMID: 28275307 PMCID: PMC5323452 DOI: 10.3748/wjg.v23.i7.1268] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Revised: 08/26/2016] [Accepted: 09/14/2016] [Indexed: 02/06/2023] Open
Abstract
AIM To evaluate the effects of hydrotalcite combined with esomeprazole on gastric ulcer healing quality.
METHODS Forty-eight patients diagnosed with gastric ulcer between June 2014 and February 2016 were randomly allocated to the combination therapy group or monotherapy group. The former received hydrotalcite combined with esomeprazole, and the latter received esomeprazole alone, for 8 wk. Twenty-four healthy volunteers were recruited and acted as the healthy control group. Endoscopic ulcer healing was observed using white light endoscopy and narrow band imaging magnifying endoscopy. The composition of collagen fibers, amount of collagen deposition, expression of factor VIII and TGF-β1, and hydroxyproline content were analyzed by Masson staining, immunohistochemistry, immunofluorescent imaging and ELISA.
RESULTS Following treatment, changes in the gastric microvascular network were statistically different between the combination therapy group and the monotherapy group (P < 0.05). There were significant differences (P < 0.05) in collagen deposition, expression level of Factor VIII and TGF-β1, and hydroxyproline content in the two treatment groups compared with the healthy control group. These parameters in the combination therapy group were significantly higher than in the monotherapy group (P < 0.05). The ratio of collagen I to collagen III was statistically different among the three groups, and was significantly higher in the combination therapy group than in the monotherapy group (P < 0.05).
CONCLUSION Hydrotalcite combined with esomeprazole is superior to esomeprazole alone in improving gastric ulcer healing quality in terms of improving microvascular morphology, degree of structure maturity and function of regenerated mucosa.
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Gennequin C, Hany S, Tidahy HL, Aouad S, Estephane J, Aboukaïs A, Abi-Aad E. Influence of the presence of ruthenium on the activity and stability of Co-Mg-Al-based catalysts in CO 2 reforming of methane for syngas production. Environ Sci Pollut Res Int 2016; 23:22744-22760. [PMID: 27562810 DOI: 10.1007/s11356-016-7453-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 08/09/2016] [Indexed: 06/06/2023]
Abstract
Hydrogen production by methane dry reforming is an important yet challenging process. A performing catalyst will favor the thermodynamic equilibrium while ensuring good hydrogen selectivity. We hereby report the synthesis of Co x Mg6-x Al2 (with x = 2 and 6) mixed oxide catalysts synthesized via hydrotalcite precursors and the synthesis of a ruthenium-based catalyst on a cobalt, magnesium, and aluminum mixed oxide supports Ru/Co x Mg6-x Al2 (with x = 2 and 6). The impregnation of ruthenium on the hydrotalcites was performed in two ways: by impregnation on the dried hydrotalcite and by memory effect on hydrotalcite calcined at 500 °C. The deposition of ruthenium by memory effect of the magnesium and cobalt support allows the generation of both metallic and basic sites which provides an active and stable catalyst for the dry reforming reaction of methane.
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Affiliation(s)
- Cédric Gennequin
- Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV, E.A. 4492), Université du Littoral Côte d'Opale (ULCO), F-59140, Dunkerque, France.
| | - Sara Hany
- Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV, E.A. 4492), Université du Littoral Côte d'Opale (ULCO), F-59140, Dunkerque, France
| | - Haingomalala Lucette Tidahy
- Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV, E.A. 4492), Université du Littoral Côte d'Opale (ULCO), F-59140, Dunkerque, France
| | - Samer Aouad
- Department of Chemistry, University of Balamand (UOB), Tripoli, Lebanon
| | - Jane Estephane
- Department of Chemical Engineering, University of Balamand (UOB), Tripoli, Lebanon
| | - Antoine Aboukaïs
- Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV, E.A. 4492), Université du Littoral Côte d'Opale (ULCO), F-59140, Dunkerque, France
| | - Edmond Abi-Aad
- Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV, E.A. 4492), Université du Littoral Côte d'Opale (ULCO), F-59140, Dunkerque, France
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Rodriguez-Chiang L, Llorca J, Dahl O. Anaerobic co-digestion of acetate-rich with lignin-rich wastewater and the effect of hydrotalcite addition. Bioresour Technol 2016; 218:84-91. [PMID: 27347802 DOI: 10.1016/j.biortech.2016.06.074] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Revised: 06/16/2016] [Accepted: 06/19/2016] [Indexed: 06/06/2023]
Abstract
The methane potential and biodegradability of different ratios of acetate and lignin-rich effluents from a neutral sulfite semi-chemical (NSSC) pulp mill were investigated. Results showed ultimate methane yields up to 333±5mLCH4/gCOD when only acetate-rich substrate was added and subsequently lower methane potentials of 192±4mLCH4/gCOD when the lignin fraction was increased. The presence of lignin showed a linear decay in methane production, resulting in a 41% decrease in methane when the lignin-rich feed had a 30% increase. A negative linear correlation between lignin content and biodegradability was also observed. Furthermore, the effect of hydrotalcite (HT) addition was evaluated and showed increase in methane potential of up to 8%, a faster production rate and higher soluble lignin removal (7-12% higher). Chemical oxygen demand (COD) removal efficiencies between 64 and 83% were obtained for all samples.
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Affiliation(s)
- Lourdes Rodriguez-Chiang
- Department of Forest Products Technology, School of Chemical Technology, Aalto University, P.O. Box 16300, Vuorimiehentie 1, Espoo, Finland; Institute of Energy Technologies, Technical University of Catalonia, Barcelona, Spain.
| | - Jordi Llorca
- Institute of Energy Technologies, Technical University of Catalonia, Barcelona, Spain
| | - Olli Dahl
- Department of Forest Products Technology, School of Chemical Technology, Aalto University, P.O. Box 16300, Vuorimiehentie 1, Espoo, Finland
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Romero MJA, Pizzi A, Toscano G, Busca G, Bosio B, Arato E. Deoxygenation of waste cooking oil and non-edible oil for the production of liquid hydrocarbon biofuels. Waste Manag 2016; 47:62-8. [PMID: 25869843 DOI: 10.1016/j.wasman.2015.03.033] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2015] [Revised: 03/19/2015] [Accepted: 03/22/2015] [Indexed: 05/25/2023]
Abstract
Deoxygenation of waste cooking vegetable oil and Jatropha curcas oil under nitrogen atmosphere was performed in batch and semi-batch experiments using CaO and treated hydrotalcite (MG70) as catalysts at 400 °C. In batch conditions a single liquid fraction (with yields greater than 80 wt.%) was produced containing a high proportion of hydrocarbons (83%). In semi-batch conditions two liquid fractions (separated by a distillation step) were obtained: a light fraction and an intermediate fraction containing amounts of hydrocarbons between 72-80% and 85-88% respectively. In order to assess the possible use of the liquid products as alternative fuels a complete chemical characterization and measurement of their properties were carried out.
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Affiliation(s)
- M J A Romero
- DICCA, Department of Civil, Chemical and Environmental Engineering, University of Genoa, Via Opera Pia, 15, 16145 Genoa, Italy.
| | - A Pizzi
- D3A, Department of Agricultural, Food and Environmental Sciences, Polytechnic University of Marche, Via Brecce Bianche, 10, 60131 Ancona, Italy
| | - G Toscano
- D3A, Department of Agricultural, Food and Environmental Sciences, Polytechnic University of Marche, Via Brecce Bianche, 10, 60131 Ancona, Italy
| | - G Busca
- DICCA, Department of Civil, Chemical and Environmental Engineering, University of Genoa, Via Opera Pia, 15, 16145 Genoa, Italy
| | - B Bosio
- DICCA, Department of Civil, Chemical and Environmental Engineering, University of Genoa, Via Opera Pia, 15, 16145 Genoa, Italy
| | - E Arato
- DICCA, Department of Civil, Chemical and Environmental Engineering, University of Genoa, Via Opera Pia, 15, 16145 Genoa, Italy
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Cheng KY, Kaksonen AH, Douglas GB. Sequential in situ hydrotalcite precipitation and biological denitrification for the treatment of high-nitrate industrial effluent. Bioresour Technol 2014; 172:373-381. [PMID: 25280045 DOI: 10.1016/j.biortech.2014.09.050] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Revised: 09/10/2014] [Accepted: 09/11/2014] [Indexed: 06/03/2023]
Abstract
A sequential process using hydrotalcite precipitation and biological denitrification was evaluated for the treatment of a magnesium nitrate (Mg(NO3)2)-rich effluent (17,000mgNO3(-)-N/L, 13,100mgMg/L) generated from an industrial nickel-mining process. The hydrotalcite precipitation removed 41% of the nitrate (7000mgNO3(-)-N/L) as an interlayer anion with an approximate formula of Mg5Al2(OH)14(NO3)2·6H2O. The resultant solute chemistry was a Na-NO3-Cl type with low trace element concentrations. The partially treated effluent was continuously fed (hydraulic retention time of 24h) into a biological fluidised bed reactor (FBR) with sodium acetate as a carbon source for 33days (1:1 v/v dilution). The FBR enabled >70% nitrate removal and a maximal NOx (nitrate+nitrite) removal rate of 97mg NOx-N/Lh under alkaline conditions (pH 9.3). Overall, this sequential process reduced the nitrate concentration of the industrial effluent by >90% and thus represents an efficient method to treat Mg(NO3)2-rich effluents on an industrial scale.
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Affiliation(s)
- Ka Yu Cheng
- CSIRO Land and Water, 147 Underwood Avenue, Floreat, WA 6014, Australia
| | - Anna H Kaksonen
- CSIRO Land and Water, 147 Underwood Avenue, Floreat, WA 6014, Australia
| | - Grant B Douglas
- CSIRO Land and Water, 147 Underwood Avenue, Floreat, WA 6014, Australia.
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Moriyama S, Sasaki K, Hirajima T. Effect of calcination temperature on Mg-Al bimetallic oxides as sorbents for the removal of F(-) in aqueous solutions. Chemosphere 2014; 95:597-603. [PMID: 24183624 DOI: 10.1016/j.chemosphere.2013.10.018] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2013] [Accepted: 10/01/2013] [Indexed: 06/02/2023]
Abstract
Bimetallic oxides were synthesized from hydrotalcite using increasing calcination temperatures (873, 1073, 1273 K). These bimetallic oxides were fully characterized and the sorption density of F(-) was investigated. X-ray diffraction patterns for the produced bimetallic oxides showed that MgO was the primary phase within the range of investigated calcination temperatures, but MgO crystallinity increased with calcination temperature and an additional MgAl2O4 phase was formed. In the process of F(-) sorption, the bimetallic oxides were primarily transformed into hydrotalcite with intercalation of F(-). The Higher calcination temperature increased the MgAl2O4 phase, which did not contribute to the immobilization of F(-). These findings show that optimizing the calcination temperature can be used to maximize the sorption density of this material for F(-) removal.
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Affiliation(s)
- Sayo Moriyama
- Department of Earth Resource Engineering, Kyushu University, Fukuoka 819-0395, Japan.
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Silvério F, Dos Reis MJ, Tronto J, Valim JB. Sorption of aspartic and glutamic aminoacids on calcined hydrotalcite. Springerplus 2013; 2:211. [PMID: 23710430 PMCID: PMC3661045 DOI: 10.1186/2193-1801-2-211] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2012] [Accepted: 05/04/2013] [Indexed: 12/03/2022]
Abstract
Sorption of aspartic and glutamic aminoacids by regeneration of calcined hydrotalcite is reported. Hydrotalcite was synthesized by coprecipitation and calcined at 773 K. Sorption experiments were performed at 298 K and 310 K, and the results reveal that at low aminoacids equilibrium concentrations, intercalation of hydroxyl anions takes place while at high equilibrium concentrations, the sorption process occur by means re-hydration and aminoacids intercalation of hydrotalcite. The results also suggested that Asp and Glu sorption is a temperature dependent process. The amount of sorbed amino acid decreases as the temperature increase. The effect is more pronounced for Glu sorption probably due to its higher hydrophobic character, which makes the sorption more difficult in comparison with sorption of Asp at higher temperature.
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Affiliation(s)
- Fabiano Silvério
- Departamento de Química - Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. Bandeirantes, 3900, CEP 14040-901 Ribeirão Preto, Brazil
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Wang ZB, Chen LL, You XD. Efficacy of esomeprazole combined with hydrotalcite and mosapride in treatment of refractory gastroesophageal reflux disease. Shijie Huaren Xiaohua Zazhi 2007; 15:901-904. [DOI: 10.11569/wcjd.v15.i8.901] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To evaluate the effect of esomeprazole combined with hydrotalcite and mosapride on refractory gastroesophageal reflux disease (rGERD).
METHODS: A total of 101 rGERD patients were randomly divided into groups A (n = 36), B B (n = 34) and C (n = 31), treated with esomeprazole plus hydrotalcite plus mosapride, esomeprazole plus mosapride, and hydrotacite plus mosapride, respectively. The clinical outcomes were observed and analyzed after 4 and 8 wk of treatment. Endoscopy was performed to evaluate the effective rate in the three groups.
RESULTS: After 4 wk of treatment, the total improvement rate was significantly higher in group A (88.9%) than that in group B (79.4%) and C (61.3%) (χ2 = 7.3531, P < 0.05). Eight weeks after treatment, the total improvement rates were 97.2%, 88.2% and 71.0% in group A, B and C, and the effective rates detected by endoscopy were 94.4%, 85.3% and 67.7%, respectively. The total improvement rate (χ2 = 9.6039, P < 0.01) and effective rate (χ2 = 8.6496, P < 0.05) were markedly higher in group A than those in B and C group.
CONCLUSION: Esomeprazole combined with hydrotalcite and mosapride may be highly effective in the treatment of rGERD.
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