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Singh K, Lohchab RK, Beniwal V, Rout C, Dhull P. Using predictive models unravel the potential of titanium oxide-loaded activated carbon for the removal of leachate ammoniacal nitrogen. ENVIRONMENTAL MONITORING AND ASSESSMENT 2024; 196:552. [PMID: 38755295 DOI: 10.1007/s10661-024-12689-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Accepted: 04/30/2024] [Indexed: 05/18/2024]
Abstract
The TiO2 nanocomposite efficiency was determined under optimized conditions with activated carbon to remove ammoniacal nitrogen (NH3-N) from the leachate sample. In this work, the facile impregnation and pyrolysis synthesis method was employed to prepare the nanocomposite, and their formation was confirmed using the FESEM, FTIR, XRD, and Raman studies. In contrast, Raman phonon mode intensity ratio ID/IG increases from 2.094 to 2.311, indicating the increase of electronic conductivity and defects with the loading of TiO2 nanoparticles. The experimental optimal conditions for achieving maximum NH3-N removal of 75.8% were found to be a pH of 7, an adsorbent mass of 1.75 mg/L, and a temperature of 30 °C, with a corresponding time of 160 min. The experimental data were effectively fitted with several isotherms (Freundlich, Hill, Khan, Redlich-Peterson, Toth, and Koble-Corrigan). The notably elevated R2 value of 0.99 and a lower ARE % of 14.61 strongly support the assertion that the pseudo-second-order model compromises a superior depiction of the NH3-N reduction process. Furthermore, an effective central composite design (CCD) of response surface methodology (RSM) was employed, and the lower RMSE value, precisely 0.45, demonstrated minimal disparity between the experimentally determined NH3-N removal percentages and those predicted by the model. The subsequent utilization of the desirability function allowed us to attain actual variable experimental conditions.
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Affiliation(s)
- Kulbir Singh
- Department of Civil Engineering, Maharishi Markandeshwar (Deemed to Be University), Mullana, Ambala, 133207, Haryana, India
- Department of Environmental Science & Engineering, Guru Jambheshwar University of Science and Technology, Hisar, 125001, Haryana, India
| | - Rajesh Kumar Lohchab
- Department of Environmental Science & Engineering, Guru Jambheshwar University of Science and Technology, Hisar, 125001, Haryana, India.
| | - Vikas Beniwal
- Department of Microbiology, Central University of Haryana, Mahendergarh, 123031, Haryana, India
| | - Chadetrik Rout
- Department of Civil Engineering, Maharishi Markandeshwar (Deemed to Be University), Mullana, Ambala, 133207, Haryana, India
| | - Paramjeet Dhull
- Department of Environmental Science & Engineering, Guru Jambheshwar University of Science and Technology, Hisar, 125001, Haryana, India
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Hussain M, Hussaini SS, Shariq M, AlMasoud N, AlZaidy GA, Hassan KF, Ali SK, Azooz RE, Siddiqui MA, Seku K. Frankincense-Based Functionalized Multiwalled Carbon Nanotubes with Iron Oxide Composites for Efficient Removal of Crystal Violet: Kinetic and Equilibrium Analysis. ACS OMEGA 2024; 9:11459-11470. [PMID: 38497024 PMCID: PMC10938398 DOI: 10.1021/acsomega.3c08011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 02/12/2024] [Accepted: 02/13/2024] [Indexed: 03/19/2024]
Abstract
In this study, novel adsorbents were developed by functionalizing multiwalled carbon nanotubes with frankincense (Fr-fMWCNT) and adding iron oxide (Fe3O4) to the adsorbent (Fr-fMWCNT-Fe3O4). The morphology, surface characteristics, and chemical nature of the synthesized samples were analyzed by using various characterization techniques. The prepared adsorbents were then applied for the elimination of the toxic dye, crystal violet (CV), from water-based solutions by employing a batch adsorption method. The effectiveness of materials for the adsorption of CV was investigated by tuning various effective experimental parameters (adsorbent dosage, dye quantity, pH, and contact time). In order to derive adsorption isotherms, the Langmuir and Freundlich adsorption models were investigated and compared. The Fr-fMWCNT and Fr-fMWCNT-Fe3O4 were found to remove 85 and 95% of the CV dye within 30 min of the adsorption experiment at pH 6, respectively. It was found that a pseudo-second-order reaction rate was consistent with the experimental adsorption kinetics. The equilibrium data demonstrated that the Langmuir model adequately explained the adsorption behavior of the CV dye on the Fr-fMWCNT and Fr-fMWCNT-Fe3O4 surfaces, respectively. According to the Langmuir study, the highest adsorption capacities of the dye are 434 mg/g for Fr-fMWCNT and 500 mg/g for Fr-fMWCNT-Fe3O4. Remediation of the CV dye using our novel composite materials has not been reported previously in the literature. The synthesized Fr-fMWCNT and Fr-fMWCNT-Fe3O4 adsorbents can be economical and green materials for the adsorptive elimination of CV dye from wastewater.
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Affiliation(s)
- Mushtaq Hussain
- Engineering
Department, College of Engineering and Technology, University of Technology and Applied Sciences, Shinas 324, Oman
| | - Syed Sulaiman Hussaini
- Engineering
Department, College of Engineering and Technology, University of Technology and Applied Sciences, Shinas 324, Oman
| | - Mohammad Shariq
- Department
of Physics, Faculty of Science, Integral
University, Lucknow 226026, India
| | - Najla AlMasoud
- Department
of Chemistry, College of Science, Princess
Nourah Bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia
| | - Ghadah Abdulrahman AlZaidy
- Department
of Physics, Faculty of Applied Science, Umm Al-Qura University, AlZahir Branch, Makkah 24383, Saudi Arabia
| | - Khaled F. Hassan
- Department
of Chemistry, College of Science, Jazan
University, Jazan 45142, Saudi Arabia
| | - Syed Kashif Ali
- Department
of Chemistry, College of Science, Jazan
University, Jazan 45142, Saudi Arabia
| | - Rehab E. Azooz
- Department
of Chemistry, College of Science, Jazan
University, Jazan 45142, Saudi Arabia
| | - Mohd Asim Siddiqui
- Engineering
Department, College of Engineering and Technology, University of Technology and Applied Sciences, Shinas 324, Oman
| | - Kondaiah Seku
- Engineering
Department, College of Engineering and Technology, University of Technology and Applied Sciences, Shinas 324, Oman
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3
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Adedeji OM, Jahan K. Removal of pollutants from aqueous product of Co-hydrothermal liquefaction: Adsorption and isotherm studies. CHEMOSPHERE 2023; 321:138165. [PMID: 36804248 DOI: 10.1016/j.chemosphere.2023.138165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 02/08/2023] [Accepted: 02/15/2023] [Indexed: 06/18/2023]
Abstract
Hydrothermal liquefaction (HTL) is an attractive technology for the conversion of wet waste into biofuel and co-HTL has been touted to increase the quality of products. However, the recovery of energy from wastewater byproduct called aqueous co-product (ACP) is limited due to the presence of toxic inhibitory substances. Adsorption has been countenanced to remove these toxic compounds but there has not been a distinct comprehensive adsorption isotherm study to explain the interaction between the adsorbate molecules and the adsorbent sites. This study investigated the sorption mechanism of oxidizable reducing pollutants measured as chemical oxygen demand (COD); heavy metals (boron and copper); and phenols from ACP samples obtained from co-HTL of brewery trub (BT), and primary sludge (PS) onto granular and powdered activated carbon (GAC and PAC). Conventional isotherm models such as Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich were used for data analysis. Results indicated that the adsorptive capacity (qe) of PAC was greater than GAC in COD adsorption (BT-1947 > 234; BTPS-617 > 245; PS-289 > 207), boron adsorption (BTPS-70 > 7; PS-53 > 49), copper adsorption (BT-5 > 1; BTPS-3 > 2; PS-1.3 > 1.1) and phenol adsorption (BT-1340 > 356; BTPS-1587 > 253; PS-460 > 245) in mg/g, μg/g, μg/g, and μg/g respectively. Comparing the adsorption of pollutants onto PAC and GAC, this study observed that PAC followed the Temkin, and Dubinin-Radushkevich models in the adsorption of the four pollutants while GAC followed the Freundlich and Langmuir models in the adsorption of phenol and copper, and Temkin, and Dubinin-Radushkevich in the adsorption of COD and boron. This study proved that combining feedstock in HTL (co-HTL) does not only change the quality of the ACP but also changes the dynamics of the adsorption isotherms. The Free Energy Change (ΔG0) result showed a spontaneous reaction in the adsorption of copper and phenol. This study presents an adsorption equilibrium information for the interpretation of adsorption isotherms for the overall improvement of adsorption mechanism pathways and the effective design of adsorption systems for the treatment of ACP.
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Affiliation(s)
- Oluwayinka M Adedeji
- Department of Civil and Environmental Engineering, Rowan University, 201 Mullica Hill Road, Glassboro, NJ, 08028, USA.
| | - Kauser Jahan
- Department of Civil and Environmental Engineering, Rowan University, 201 Mullica Hill Road, Glassboro, NJ, 08028, USA
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Bhattu M, Singh J. Recent advances in nanomaterials based sustainable approaches for mitigation of emerging organic pollutants. CHEMOSPHERE 2023; 321:138072. [PMID: 36773680 DOI: 10.1016/j.chemosphere.2023.138072] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 01/25/2023] [Accepted: 02/05/2023] [Indexed: 06/18/2023]
Abstract
Emerging organic pollutants (EOPs) are a category of pollutants that are relatively new to the environment and recently garnered a lot of attention. The majority of EOPs includes endocrine-disrupting chemicals (EDCs), antibiotic resistance genes (ARGs), pesticides, dyes and pharmaceutical and personal care products (PPCPs). Exposure to contaminated water has been linked to an increase in incidences of malnutrition, intrauterine growth retardation, respiratory illnesses, liver malfunctions, eye and skin diseases, and fatalities. Consequently, there is a critical need for wastewater remediation technologies which are effective, reliable, and economical. Conventional wastewater treatment methods have several shortcomings that can be addressed with the help of nanotechnology. Unique characteristics of nanomaterials (NMs) make them intriguing and efficient alternative in wastewater treatment strategies. This review emphasis on the occurrence of divers emerging organic pollutants (EOPs) in water and their effective elimination via different NMs based methods with in-depth mechanisms. Furthermore, it also delves the toxicity assessment of NMs and critical challenges, which are crucial steps for practical implementations.
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Affiliation(s)
- Monika Bhattu
- Department of Chemistry, Chandigarh University, Mohali, 140413, Punjab, India; University Centre for Research and Development, Chandigarh University, Mohali, 140413, Punjab, India
| | - Jagpreet Singh
- University Centre for Research and Development, Chandigarh University, Mohali, 140413, Punjab, India.
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Agarwal S, Singh AP, Mathur S. Removal of COD and color from textile industrial wastewater using wheat straw activated carbon: an application of response surface and artificial neural network modeling. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:41073-41094. [PMID: 36630034 DOI: 10.1007/s11356-022-25066-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2022] [Accepted: 12/26/2022] [Indexed: 06/17/2023]
Abstract
A novel approach has been undertaken wherein chemically modified wheat straw activated carbon (WSAC) as adsorbent is developed, characterized, and examined for the removal of COD and color from the cotton dyeing industry effluent. Thirty experimental runs are designed for batch reactor study using the central composite method (CCM) for optimizing process parameters, namely biochar dose, time of contact, pH, and temperature, for examining the effect on COD and color-removing efficiency of WSAC. The experimental data have been modeled using the machine learning approaches such as polynomial quadratic regression and artificial neural networks (ANN). The determined optimum conditions are pH: 7.18, time of contact: 85.229 min, adsorbent dose: 2.045 g/l, and temperature: 40.885 °C, at which the COD and color removal efficiency is 90.92 and 94.48%, respectively. The nonlinear pseudo-second order (PSO) kinetic model shows good coefficient of determination (R2 ~ 1) values. The maximum adsorption capacity for COD and color by WSAC is at the pH of 7, the temperature of 40 °C, adsorbent dose of 2 g/l is obtained at the contact time of 80 min is 434.78 mg/g and 331.55 PCU/g, respectively. The COD removal and decolorization is more than 70% in the first 20 min of the experiment. The primary adsorption mechanism involves hydrogen bonding, electrostatic attraction, n-π interactions, and cation exchange. Finally, the adsorbent is environmentally benign and cost-effective, costing 16.66% less than commercially available carbon. The result of the study indicates that WSAC is a prominent solution for treating textile effluent. The study is beneficial in reducing the pollutants from textile effluents and increasing the reuse of treated effluent in the textile industries.
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Affiliation(s)
- Somya Agarwal
- Civil Engineering Department, Birla Institute of Technology and Science, Pilani, 333031, India
| | - Ajit Pratap Singh
- Civil Engineering Department, Birla Institute of Technology and Science, Pilani, 333031, India.
| | - Sudheer Mathur
- Civil Engineering Department, Birla Institute of Technology and Science, Pilani, 333031, India
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Kovo AS, Alaya-Ibrahim S, Abdulkareem AS, Adeniyi OD, Egbosiuba TC, Tijani JO, Saheed M, Okafor BO, Adeyinka YS. Column adsorption of biological oxygen demand, chemical oxygen demand and total organic carbon from wastewater by magnetite nanoparticles-zeolite A composite. Heliyon 2023; 9:e13095. [PMID: 36793965 PMCID: PMC9922975 DOI: 10.1016/j.heliyon.2023.e13095] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 01/11/2023] [Accepted: 01/16/2023] [Indexed: 01/26/2023] Open
Abstract
Herein, magnetite nanoparticles (NPs), zeolite A and magnetite-zeolite A (MAGZA) composite was developed by green methods. The produced nanomaterials were characterized and the effect of process parameters such as flow rate, adsorbent bed height and adsorbate inlet concentration was evaluated for the removal of biological oxygen demand (BOD), chemical oxygen demand (COD) and total organic carbon (TOC) in a column. The characterization results demonstrated the successful synthesis of magnetite NPs, zeolite A and MAGZA composite. The performance of the MAGZA composite in the fixed-bed column was superior to zeolite A and magnetite NPs. The parametric influence indicates that an increase in bed height and a decrease in the flow rate and inlet adsorbate concentration improved the performance of the adsorption column. The adsorption column demonstrated maximum performance at a flow rate (4 mL/min), bed height (5 cm) and inlet adsorbate concentration (10 mg/L). Under these conditions, the highest percent removal of BOD, COD and TOC were 99.96, 99.88 and 99.87%. Thomas and Yoon-Nelson's model suitably fitted the breakthrough curves. After five reusability cycles, the MAGZA composite demonstrated removal percent of BOD (76.5%), COD (55.5%) and TOC (64.2%). The produced MAGZA composite effectively removed BOD, COD and TOC from textile wastewater in a continuous operating mode.
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Affiliation(s)
- Abdulsalami Sanni Kovo
- Chemical Engineering Department, Federal University of Technology, PMB 65, Minna, Niger State, Nigeria,Nanotechnology Research Group, African Centre for Excellence on Mycotoxin, Federal University of Technology, PMB 65, Minna, Niger State, Nigeria
| | - Sherifat Alaya-Ibrahim
- Chemical Engineering Department, Federal University of Technology, PMB 65, Minna, Niger State, Nigeria,Nanotechnology Research Group, African Centre for Excellence on Mycotoxin, Federal University of Technology, PMB 65, Minna, Niger State, Nigeria
| | - Ambali Saka Abdulkareem
- Chemical Engineering Department, Federal University of Technology, PMB 65, Minna, Niger State, Nigeria,Nanotechnology Research Group, African Centre for Excellence on Mycotoxin, Federal University of Technology, PMB 65, Minna, Niger State, Nigeria
| | - Olalekan David Adeniyi
- Chemical Engineering Department, Federal University of Technology, PMB 65, Minna, Niger State, Nigeria
| | - Titus Chinedu Egbosiuba
- Chemical Engineering Department, Chukwuemeka Odumegwu Ojukwu University, PMB 02, Uli Campus, Anambra State, Nigeria,Nanotechnology Research Group, African Centre for Excellence on Mycotoxin, Federal University of Technology, PMB 65, Minna, Niger State, Nigeria,Corresponding author. Chemical Engineering Department, Chukwuemeka Odumegwu Ojukwu University, PMB 02, Uli Campus, Anambra State, Nigeria.
| | - Jimoh Oladejo Tijani
- Chemistry Department, Federal University of Technology, Minna, PMB 65, Minna, Niger State, Nigeria,Nanotechnology Research Group, African Centre for Excellence on Mycotoxin, Federal University of Technology, PMB 65, Minna, Niger State, Nigeria
| | - Mustapha Saheed
- Chemistry Department, Federal University of Technology, Minna, PMB 65, Minna, Niger State, Nigeria,Nanotechnology Research Group, African Centre for Excellence on Mycotoxin, Federal University of Technology, PMB 65, Minna, Niger State, Nigeria
| | - Blessing Onyinye Okafor
- Chemical Engineering Department, Chukwuemeka Odumegwu Ojukwu University, PMB 02, Uli Campus, Anambra State, Nigeria
| | - Yusuff Sikiru Adeyinka
- Chemical and Petroleum Engineering Department, Afe Babalola University, Ado-Ekiti, Nigeria
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Fouda-Mbanga BG, Tywabi-Ngeva Z. Application of Pineapple Waste to the Removal of Toxic Contaminants: A Review. TOXICS 2022; 10:561. [PMID: 36287842 PMCID: PMC9610545 DOI: 10.3390/toxics10100561] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Revised: 09/05/2022] [Accepted: 09/09/2022] [Indexed: 06/16/2023]
Abstract
The presence of pollutants in large swaths of water is among the most pressing environmental issues of our time. This is mainly due to the inappropriate disposal of industrial sewerage into nearby water supplies and the production of a broad range of potentially hazardous contaminants. Pineapple is a fruit mainly grown in tropical regions. Refuse production begins with the collection of raw materials and continues prior to being refined. Pineapple processing industries generate waste (peel, core, pomace, and crown) that is high in bioactive compounds. The byproducts often include more valuable compounds with greater nutritional and therapeutic value than the final product. This review focuses on the application of pineapple and components, adsorbent synthesized from pineapple for the removal of pollutants.
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8
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COD adsorption and optimization from produced water using chitosan–ZnO nanocomposite. APPLIED NANOSCIENCE 2022. [DOI: 10.1007/s13204-022-02392-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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9
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Dutta D, Gaur N, Dubey R, Yadav J, Borah JP, Puzari A. Carbon nanotubes ornamented hollow polymethyl methacrylate microspheres for turbidity removal from water. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 304:114242. [PMID: 34910995 DOI: 10.1016/j.jenvman.2021.114242] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 11/01/2021] [Accepted: 12/03/2021] [Indexed: 06/14/2023]
Abstract
Novel materials with low density are being synthesized with great interest owing to their effectiveness in water purification systems. Materials of micro/nano-scale provide outstanding results in miniature point-of-use devices because of their high surface-to-volume ratio. In this study, we report the successful synthesis of hollow polymethyl methacrylate microspheres (HPM) coated with functionalized carbon nanotubes (f-CNTs) (CHPM) by employing solvent evaporation and in situ coating techniques. The surface coating of HPM with the f-CNTs was visually confirmed by the surface roughness recorded in scanning electron microscopy. Furthermore, characterization with Fourier transform infrared spectroscopy substantiated the presence of hydroxyl and carboxyl groups of f-CNTs on the CHPM. The efficiency of CHPM to remove the turbidity from surface water was evaluated. The CHPM was effective in bringing down the turbidity of the water from 500 NTU to <1 NTU (>97%) which was within the desirable limit of the Bureau of Indian Standards. The temperature and pH for maximum reduction in turbidity were optimized to 49.5 °C and 4.5, respectively. Moreover, kinetic studies of CHPM indicated that the material followed the Langmuir isotherm model with regeneration efficiency lasting more than 10 cycles. From the results, we propose a simple, facile, and cost-effective synthetic route for the synthesis of CHPM for water purification, especially for turbidity removal. The synthesized CHPM with low density and relatively large surface area offer huge potential in water treatment applications and related fields.
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Affiliation(s)
- Dhiraj Dutta
- Defence Research Laboratory, Post Bag No. 2, Tezpur, 784001, Assam, India; National Institute of Technology Nagaland, Chumukedima, Dimapur, Pin, 797 103, Nagaland, India
| | - Nisha Gaur
- Defence Research Laboratory, Post Bag No. 2, Tezpur, 784001, Assam, India
| | - Rama Dubey
- Defence Research Laboratory, Post Bag No. 2, Tezpur, 784001, Assam, India
| | - Jitendra Yadav
- Defence Materials and Stores Research and Development Establishment, Kanpur, 208 013, India
| | - Jyoti Prasad Borah
- National Institute of Technology Nagaland, Chumukedima, Dimapur, Pin, 797 103, Nagaland, India
| | - Amrit Puzari
- National Institute of Technology Nagaland, Chumukedima, Dimapur, Pin, 797 103, Nagaland, India.
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10
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El Attar A, Chemchoub S, Diallo Kalan M, Oularbi L, El Rhazi M. Designing New Material Based on Functionalized Multi-Walled Carbon Nanotubes and Cu(OH)2–Cu2O/Polypyrrole Catalyst for Ethanol Oxidation in Alkaline Medium. Front Chem 2022; 9:805654. [PMID: 35186892 PMCID: PMC8854777 DOI: 10.3389/fchem.2021.805654] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Accepted: 12/28/2021] [Indexed: 11/13/2022] Open
Abstract
In this work, copper(II) hydroxide (Cu(OH)2) and copper oxide (Cu2O) nanostructures are deposited on functionalized multi-walled carbon nanotubes/polypyrrole to report an efficient electrocatalyst for ethanol oxidation in alkaline medium. In the first step, the deposition of functionalized multi-walled nanotubes of carbon (F-MWCNTs) on the electrode surface was carried out using drop casting mode followed by the electrodeposition of polypyrrole (PPy) and copper nanoparticles (Cu-Nps) using galvanostatic mode. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were performed in order to study the morphology and the structure of the elaborated catalysts. Electrochemical characterization conducted by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) revealed that the introduction of functionalized multi-walled carbon nanotubes enhances the electric properties of the nanocomposites and offers a large active surface area. The prepared electrocatalyst was then tested in a solution of 0.1 M NaOH containing 0.2 M of ethanol showing high performance (7 mA cm−2 at 0.85 V vs Ag/AgCl) and good stability (over 1800 s) toward ethanol oxidation.
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11
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Hoang AT, Nižetić S, Cheng CK, Luque R, Thomas S, Banh TL, Pham VV, Nguyen XP. Heavy metal removal by biomass-derived carbon nanotubes as a greener environmental remediation: A comprehensive review. CHEMOSPHERE 2022; 287:131959. [PMID: 34454224 DOI: 10.1016/j.chemosphere.2021.131959] [Citation(s) in RCA: 53] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 08/07/2021] [Accepted: 08/18/2021] [Indexed: 06/13/2023]
Abstract
The concentrations of heavy metal ions found in waterways near industrial zones are often exceed the prescribed limits, posing a continued danger to the environment and public health. Therefore, greater attention has been devoted into finding the efficient solutions for adsorbing heavy metal ions. This review paper focuses on the synthesis of carbon nanotubes (CNTs) from biomass and their application in the removal of heavy metals from aqueous solutions. Techniques to produce CNTs, benefits of modification with various functional groups to enhance sorption uptake, effects of operating parameters, and adsorption mechanisms are reviewed. Adsorption occurs via physical adsorption, electrostatic interaction, surface complexation, and interaction between functional groups and heavy metal ions. Moreover, factors such as pH level, CNTs dosage, duration, temperature, ionic strength, and surface property of adsorbents have been identified as the common factors influencing the adsorption of heavy metals. The oxygenated functional groups initially present on the surface of the modified CNTs are responsible towards the adsorption enhancement of commonly-encountered heavy metals such as Pb2+, Cu2+, Cd2+, Co2+, Zn2+, Ni2+, Hg2+, and Cr6+. Despite the recent advances in the application of CNTs in environmental clean-up and pollution treatment have been demonstrated, major obstacles of CNTs such as high synthesis cost, the agglomeration in the post-treated solutions and the secondary pollution from chemicals in the surface modification, should be critically addressed in the future studies for successful large-scale applications of CNTs.
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Affiliation(s)
- Anh Tuan Hoang
- Institute of Engineering, Ho Chi Minh City University of Technology (HUTECH), Ho Chi Minh City, Viet Nam.
| | - Sandro Nižetić
- University of Split, FESB, Rudjera Boskovica 32, 21000, Split, Croatia
| | - Chin Kui Cheng
- Department of Chemical Engineering, College of Engineering, Khalifa University, P.O. Box 127788, Abu Dhabi, United Arab Emirates; Center for Catalysis and Separation (CeCaS), Khalifa University, P.O. Box 127788, Abu Dhabi, United Arab Emirates.
| | - Rafael Luque
- Departamento de Química Orgánica, Universidad de Cordoba, Campus de Rabanales, Edificio Marie Curie, Ctra. Nnal. IV-A, Km. 396, E-14014, Cordoba, Spain; Peoples Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya Str., 117198, Moscow, Russia.
| | - Sabu Thomas
- School of Energy Materials, Mahatma Gandhi University, Kottayam, Kerala, India
| | - Tien Long Banh
- Hanoi University of Science and Technology, Hanoi, Viet Nam
| | - Van Viet Pham
- PATET Research Group, Ho Chi Minh City University of Transport, Ho Chi Minh City, Viet Nam
| | - Xuan Phuong Nguyen
- PATET Research Group, Ho Chi Minh City University of Transport, Ho Chi Minh City, Viet Nam.
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12
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Akintayo CO, Aremu OH, Igboama WN, Nelana SM, Ayanda OS. Performance Evaluation of Ultra-Violet Light and Iron Oxide Nanoparticles for the Treatment of Synthetic Petroleum Wastewater: Kinetics of COD Removal. MATERIALS 2021; 14:ma14175012. [PMID: 34501100 PMCID: PMC8434562 DOI: 10.3390/ma14175012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 08/16/2021] [Accepted: 08/18/2021] [Indexed: 11/16/2022]
Abstract
In this study, the use of ultra-violet (UV) light with or without iron oxide nanoparticles (IONPs) for the degradation of synthetic petroleum wastewater was investigated. The IONPs was synthesised by sodium borohydride reduction of ferric chloride solution and was characterised by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectrometry (FTIR), x-ray fluorescence spectrophotometry (XRF), and energy dispersive spectroscopy (EDS). The amount of degradation was evaluated by chemical oxygen demand (COD) determination. Experimental results show that the COD removal from synthetic petroleum wastewater by IONPs/UV system was more effective than they were independently. The combination of UV light at a wavelength of 254 nm, pH of 8, and 1.0 g of IONPs resulted in COD removal from 10.5% up to 95.5%. The photocatalytic degradation of synthetic petroleum wastewater is about 1.3-2.0 times faster in comparison to UV light only. The removal of COD from synthetic petroleum wastewater by UV light and IONPs follows the pseudo-first-order kinetic model with rate constant k ranging from 0.0133 min-1 to 0.0269 min-1. Consequently, this study has shown that the use of UV light in the presence of IONPs is favourable and effective for the removal of organic pollutants from petroleum refinery wastewater.
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Affiliation(s)
- Cecilia O. Akintayo
- Nanoscience Research Unit, Department of Industrial Chemistry, Federal University Oye Ekiti, P.M.B 373, Oye Ekiti 362001, Nigeria; (C.O.A.); (O.H.A.)
| | - Omolola H. Aremu
- Nanoscience Research Unit, Department of Industrial Chemistry, Federal University Oye Ekiti, P.M.B 373, Oye Ekiti 362001, Nigeria; (C.O.A.); (O.H.A.)
| | - Wilfred N. Igboama
- Department of Physics, Federal University Oye Ekiti, P.M.B 373, Oye Ekiti 362001, Nigeria;
| | - Simphiwe M. Nelana
- Department of Chemistry, Vaal University of Technology, Vanderbijlpark 1900, South Africa;
| | - Olushola S. Ayanda
- Nanoscience Research Unit, Department of Industrial Chemistry, Federal University Oye Ekiti, P.M.B 373, Oye Ekiti 362001, Nigeria; (C.O.A.); (O.H.A.)
- Correspondence:
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