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Al-Nadabi H, Jellali S, Hamdi W, Al-Tamimi A, Al-Raeesi A, Al-Sidairi A, Al-Busaidi W, Al-Hanai A, Al-Zeidi K, Al-Wardy M, Jeguirim M. Synthesis of Lanthanum-Modified Natural Magnetite: Characterization and Valorization for Phosphorus Recovery from Aqueous Solutions. MATERIALS (BASEL, SWITZERLAND) 2025; 18:2283. [PMID: 40429020 PMCID: PMC12113161 DOI: 10.3390/ma18102283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2025] [Revised: 05/08/2025] [Accepted: 05/11/2025] [Indexed: 05/29/2025]
Abstract
In this research work, a natural sample from an Omani magnetite (MG) deposit was used for the synthesis of a magnetite decorated with ferrihydrite (MG-Fh), and two lanthanum (La)-modified materials at mass percentages of 5% (MG-Fh-La-5) and 15% (MG-Fh-La-15). These materials were first characterized using various analytical techniques. Then, their phosphorus (P) recovery efficacy from aqueous solutions was studied in batch mode under a wide range of experimental conditions. The characterization results show that compared to the raw feedstock, MG-Fh, MG-Fh-La-5, and especially MG-Fh-La-15 have improved structural, textural, and surface chemistry properties. Adsorption tests indicate that due to the deposition of high contents of lanthanum oxides on its surface, the MG-La-15 exhibited a large P uptake capacity (34.5 mg g-1), which is significantly superior to those determined for MG-La-5 (24.3 mg g-1), MG-Fh (12.4 mg g-1), and various engineered materials published in the literature. Moreover, these materials retain an interesting ability to recover P from real wastewater with a highest adsorbed mass of 27.3 mg g-1, observed for MG-La-15. The P recovery seems to involve both physical and chemical mechanisms, including electrostatic interactions and complexation. This research work shows that La-modified magnetite can be considered a promising and eco-friendly material for P recovery from liquid effluents.
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Affiliation(s)
- Hamed Al-Nadabi
- Centre for Environmental Studies and Research, Sultan Qaboos University, Al-Khoud 123, Muscat P.O. Box 17, Oman; (H.A.-N.); (A.A.-R.); (A.A.-S.); (K.A.-Z.); (M.A.-W.)
| | - Salah Jellali
- Centre for Environmental Studies and Research, Sultan Qaboos University, Al-Khoud 123, Muscat P.O. Box 17, Oman; (H.A.-N.); (A.A.-R.); (A.A.-S.); (K.A.-Z.); (M.A.-W.)
| | - Wissem Hamdi
- Higher Institute of the Sciences and Techniques of Waters, University of Gabes, Gabes 6033, Tunisia;
| | - Afrah Al-Tamimi
- Centre for Environmental Studies and Research, Sultan Qaboos University, Al-Khoud 123, Muscat P.O. Box 17, Oman; (H.A.-N.); (A.A.-R.); (A.A.-S.); (K.A.-Z.); (M.A.-W.)
| | - Ahmed Al-Raeesi
- Centre for Environmental Studies and Research, Sultan Qaboos University, Al-Khoud 123, Muscat P.O. Box 17, Oman; (H.A.-N.); (A.A.-R.); (A.A.-S.); (K.A.-Z.); (M.A.-W.)
| | - Ahmed Al-Sidairi
- Centre for Environmental Studies and Research, Sultan Qaboos University, Al-Khoud 123, Muscat P.O. Box 17, Oman; (H.A.-N.); (A.A.-R.); (A.A.-S.); (K.A.-Z.); (M.A.-W.)
| | - Waleed Al-Busaidi
- College of Agricultural and Marine Sciences, Sultan Qaboos University, Al-Khoud 123, Muscat P.O. Box 17, Oman;
| | - Ahlam Al-Hanai
- Centre for Environmental Studies and Research, Sultan Qaboos University, Al-Khoud 123, Muscat P.O. Box 17, Oman; (H.A.-N.); (A.A.-R.); (A.A.-S.); (K.A.-Z.); (M.A.-W.)
| | - Khalifa Al-Zeidi
- Centre for Environmental Studies and Research, Sultan Qaboos University, Al-Khoud 123, Muscat P.O. Box 17, Oman; (H.A.-N.); (A.A.-R.); (A.A.-S.); (K.A.-Z.); (M.A.-W.)
| | - Malik Al-Wardy
- Centre for Environmental Studies and Research, Sultan Qaboos University, Al-Khoud 123, Muscat P.O. Box 17, Oman; (H.A.-N.); (A.A.-R.); (A.A.-S.); (K.A.-Z.); (M.A.-W.)
| | - Mejdi Jeguirim
- The Institute of Materials Science of Mulhouse (IS2M), UMR 7361, University of Haute Alsace, CNRS, P.O. Box 2488, 68100 Mulhouse, France;
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El Kaim Billah R, Khan MA, Essenni S, Achak M, Majdoubi H, Bahsis L, Lima E, Jeon BH. A mechanistic insight into anionic phosphate adsorption on developed chitosan.ZnO@metakaolin biocomposite. Int J Biol Macromol 2025; 308:142405. [PMID: 40139600 DOI: 10.1016/j.ijbiomac.2025.142405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2024] [Revised: 09/29/2024] [Accepted: 03/20/2025] [Indexed: 03/29/2025]
Abstract
Due to their high efficiency, chitosan (Cs)-based materials are increasingly utilized for wastewater treatment applications. In this study, a novel Cs-based biocomposite, Cs.ZnO@Mk was developed by blending Cs with zinc oxide (ZnO) and metakaolin (Mk), and was evaluated for its capability as a biosorbent to remove phosphate (PO43-) ions from water. The biosorbent was characterized using FTIR, XRD, TGA, SEM, and XPS techniques. The determined optimal conditions for PO43- removal were pH 4, initial concentration 100 mg/L, and contact time 120 min, achieving 98.9 % PO43- removal efficiency. The adsorption isotherm and kinetic data were fitted well to Langmuir isotherm and pseudo-second-order kinetic models, while thermodynamic study affirmed that the adsorption process was exothermic. XPS analysis suggested that electrostatic attraction and ligand-exchange were the key mechanisms for PO43- adsorption. Further mechanistic insights were gained through density functional theory (DFT) calculations and non-covalent interaction (NCI) analysis. Regeneration and counter-ions effect studies confirmed the effectiveness and stability of Cs.ZnO@Mk during PO43- adsorption. This demonstrates well its potential as a robust biosorbent for effective PO43- removal from industrial effluents.
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Affiliation(s)
- Rachid El Kaim Billah
- National school of applied sciences, Chouaib Doukkali University, Avenue Jabran Khalil Jabran B.P 299-24000, El Jadida, Morocco
| | - Moonis Ali Khan
- Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
| | - Said Essenni
- Laboratory of Coordination and analytical chemistry (LCCA), Faculty of Science, Chouaib Doukkali University (UCD), 24000 El Jadida, Morocco
| | - Mounia Achak
- National school of applied sciences, Chouaib Doukkali University, Avenue Jabran Khalil Jabran B.P 299-24000, El Jadida, Morocco; Chemical and Biochemical Sciences, Green Process Engineering, CBS, Mohammed VI Polytechnic University, Ben Guerir 43150, Morocco
| | - Hicham Majdoubi
- Materials Science Energy and Nanoengineering Department, Mohamed VI Polytechnic University, Benguerir, Morocco
| | - Lahoucine Bahsis
- Laboratoire de Chimie Analytique Et Moléculaire, Faculté Poly-Disciplinaire, Université Cadi Ayyad, BP 4162, 46000 Safi, Morocco
| | - Eder Lima
- Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, RS 91501-970, Brazil
| | - Byong-Hun Jeon
- Department of Earth Resources and Environmental Engineering, Hanyang University, Seoul 04763, Republic of Korea
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Ran M, Nie X, Wang J, Xie R, Lin X, Zhu H, Wan Q, Fu Y. Deposition behaviors and interfacial interaction mechanism between carboxyl-modified polystyrene nanoplastics and magnetite in aquatic environment. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2025; 290:117608. [PMID: 39733597 DOI: 10.1016/j.ecoenv.2024.117608] [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: 07/31/2024] [Revised: 11/18/2024] [Accepted: 12/21/2024] [Indexed: 12/31/2024]
Abstract
In aquatic environments, the deposition behaviors of nanoplastics (NPs) are closely associated with interfacial interaction between NPs and iron (hydr)oxides minerals, which are typically coupled with solution chemistry and organic matter. However, the roles of solution chemistry and organic matter in the deposition behavior of NPs with iron (hydr)oxides minerals and related interfacial interaction mechanism are still poorly understood. In this study, the deposition behaviors of carboxyl-modified polystyrene nanoparticles (COOH-PSNPs) with magnetite were systematically investigated. The results showed that electrostatic attraction, hydrogen bond, and charge-assisted hydrogen bond (CAHB) were the main forces for the deposition and interfacial interaction mechanism between COOH-PSNPs and magnetite. Increasing pH could significantly inhibit the deposition of COOH-PSNPs with magnetite. At pH 6.5, phosphate and dichromate significantly inhibited the deposition of COOH-PSNPs since their competitive adsorption for the surface sites on magnetite led to a potential reversal of magnetite, resulting in the strong electrostatic repulsion between COOH-PSNPs and magnetite. Moreover, when the concentration of phosphate exceeded 0.01 mM, the deposition of COOH-PSNPs was completely hindered. Organic macromolecules (OMs) markedly inhibited the interfacial interaction and deposition of COOH-PSNPs with magnetite by enhancing the electrostatic repulsion and steric hindrance between COOH-PSNPs and magnetite due to the formation of magnetite-OM associations. The inhibition abilities followed the order sodium alginate (0.1 mM) > humic acid (0.2 mM) > bovine serum albumin (5 mM). This study may provide insights for better understanding of environmental behaviors of COOH-PSNPs associated with magnetite and organic matter in natural environments at the molecular level.
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Affiliation(s)
- Meimei Ran
- School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang 550025, China; State Key Laboratory of Ore Deposit Geochemistry, Research Center of Ecological Environment and Resource Utilization, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
| | - Xin Nie
- State Key Laboratory of Ore Deposit Geochemistry, Research Center of Ecological Environment and Resource Utilization, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
| | - Jingxin Wang
- Guangdong Provincial Engineering Research Center of Public Health Detection and Assessment, School of Public Health, Guangdong Pharmaceutical University, Guangzhou 510310, China
| | - Ruiyin Xie
- State Key Laboratory of Ore Deposit Geochemistry, Research Center of Ecological Environment and Resource Utilization, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China; Guangdong Provincial Engineering Research Center of Public Health Detection and Assessment, School of Public Health, Guangdong Pharmaceutical University, Guangzhou 510310, China
| | - Xiaoping Lin
- State Key Laboratory of Ore Deposit Geochemistry, Research Center of Ecological Environment and Resource Utilization, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China; Guangdong Provincial Engineering Research Center of Public Health Detection and Assessment, School of Public Health, Guangdong Pharmaceutical University, Guangzhou 510310, China
| | - Hanjun Zhu
- State Key Laboratory of Ore Deposit Geochemistry, Research Center of Ecological Environment and Resource Utilization, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
| | - Quan Wan
- State Key Laboratory of Ore Deposit Geochemistry, Research Center of Ecological Environment and Resource Utilization, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
| | - Yuhong Fu
- School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang 550025, China.
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Maharathi P, Eripogu KK, Lo SL. Nutrients recovery from livestock wastewater by batch and gas bubble-column studies with biochar, nano-composite material, and ammonium magnesium phosphate hydrate. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 366:121722. [PMID: 38991346 DOI: 10.1016/j.jenvman.2024.121722] [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: 04/04/2024] [Revised: 06/28/2024] [Accepted: 07/02/2024] [Indexed: 07/13/2024]
Abstract
The breeding of livestock raises substantial environmental concerns, especially the efficient management of nutrients and pollution. This research is designed to assess the potency of char and modified char in diluting nutrient concentrations in livestock wastewater. The characteristics of graphene oxide, struvite, and calcium-modified char were inspected, defining their efficacy in both batch and bed-column investigations of nutrient sorption. Various factors, including sorption capacity, time of contact, ion levels, a decrease in ion levels over time, and sorption kinetics, have been considered, along with their appropriateness for respective models. The first evaluation of the options concluded that 600 °C char was better since it exhibited higher removal efficiency. Modified char sorption data at 600 °C was used to adjust the models "PSOM, Langmuir", and "Thomas". The models were applied to both batch and bed-column experiments. The maximum phosphate sorption was 110.8 mg/g, 85.73 mg/g, and 82.46 mg/g for B-GO, B-S, and B-C modified chars respectively, in the batch experiments. The highest phosphate sorption in column experiments, at a flow rate of 400 μl/min, was 51.23 mg per 10 g of sorbent. This corresponds to a sorption rate of 5.123 mg/g. B-GO and B-S modified chars showed higher sorption capacities; this was observed in both the batch and bed-column studies. This displayed the capability of graphene oxide and struvite-modified chars for efficient ion and nutrient uptake, whether in single or multi-ion environments, making them a very good candidate for nutrient filtration in livestock wastewater treatment. Additionally, B-GO char enhanced the sorption of phosphate, resulting in augmented seed germination and seedling growth. These results reveal that B-GO char can be used as a possible substitute for chemical fertilizers.
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Affiliation(s)
- Payal Maharathi
- Graduate Institute of Environmental Engineering (GIEE), National Taiwan University (NTU), Taipei, 106, Taiwan
| | - Kiran Kumar Eripogu
- Biodiversity Program, Taiwan International Graduate Program, Biodiversity Research Center, Academia Sinica, Taipei, 106, Taiwan; Department of Life Sciences, National Taiwan Normal University, Taipei, 106, Taiwan
| | - Shang Lien Lo
- Graduate Institute of Environmental Engineering (GIEE), National Taiwan University (NTU), Taipei, 106, Taiwan.
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Jokić Govedarica J, Tomašević Pilipović D, Gvoić V, Kerkez Đ, Leovac Maćerak A, Slijepčević N, Bečelić-Tomin M. Eco-friendly nanoparticles: mechanisms and capacities for efficient removal of heavy metals and phosphate from water using definitive screening design approach. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 2024; 46:118. [PMID: 38478162 DOI: 10.1007/s10653-024-01879-7] [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: 12/17/2023] [Accepted: 01/19/2024] [Indexed: 04/12/2024]
Abstract
Can nano-zero-valent iron, synthesized using oak leaf extract, be the key solution for water preservation, efficiently removing heavy metal ions and phosphate anions simultaneously? This research unveils how this technology not only promises high efficiency in the remediation of water resources, but also sets new standards for environmentally friendly processes. The high antioxidant capacity and high phenol content indicate suggest the possibility of oak-nZVI synthesis using oak leaf extract as a stable material with minimal agglomeration. The simultaneous removal of Cd and phosphates, as well as and Ni and phosphates was optimized by a statistically designed experiment with a definitive screening design approach. By defining the key factors with the most significant impact, a more efficient and faster method is achieved, improving the economic sustainability of the research by minimizing the number of experiments while maximizing precision. In terms of significance, four input parameters affecting process productivity were monitored: initial metal concentration (1-9 mg L-1), initial ion concentration (1-9 mg L-1), pH value (2-10), and oak-nZVI dosage (2-16 mL). The process optimization resulted in the highest simultaneous removal efficiency of 98.99 and 87.30% for cadmium and phosphate ions, respectively. The highest efficiency for the simultaneous removal of nickel and phosphate ions was 93.44 and 96.75%, respectively. The optimization process fits within the confidence intervals, which confirms the assumption that the selected regression model well describes the process. In the context of e of the challenges and problems of environmental protection, this work has shown considerable potential and successful application for the simultaneous removal of Cd(II) and Ni(II) in the presence of phosphates from water.
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Affiliation(s)
- Jovana Jokić Govedarica
- Faculty of Sciences, Department of Chemistry, Biochemistry and Environmental Protection, University of Novi Sad, Trg Dositeja Obradovića 3, 21000, Novi Sad, Serbia
| | - Dragana Tomašević Pilipović
- Faculty of Sciences, Department of Chemistry, Biochemistry and Environmental Protection, University of Novi Sad, Trg Dositeja Obradovića 3, 21000, Novi Sad, Serbia.
| | - Vesna Gvoić
- Faculty of Technical Sciences, Department of Graphic Engineering and Design, University of Novi Sad, Trg Dositeja Obradovića 6, 21000, Novi Sad, Serbia
| | - Đurđa Kerkez
- Faculty of Sciences, Department of Chemistry, Biochemistry and Environmental Protection, University of Novi Sad, Trg Dositeja Obradovića 3, 21000, Novi Sad, Serbia
| | - Anita Leovac Maćerak
- Faculty of Sciences, Department of Chemistry, Biochemistry and Environmental Protection, University of Novi Sad, Trg Dositeja Obradovića 3, 21000, Novi Sad, Serbia
| | - Nataša Slijepčević
- Faculty of Sciences, Department of Chemistry, Biochemistry and Environmental Protection, University of Novi Sad, Trg Dositeja Obradovića 3, 21000, Novi Sad, Serbia
| | - Milena Bečelić-Tomin
- Faculty of Sciences, Department of Chemistry, Biochemistry and Environmental Protection, University of Novi Sad, Trg Dositeja Obradovića 3, 21000, Novi Sad, Serbia
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Li X, Hu X, Fu Y, Ai H, Fu ML, Yuan B. Removal of phosphate at low concentration from water by porous PVA/Al 2O 3 composites. ENVIRONMENTAL TECHNOLOGY 2022; 43:345-354. [PMID: 32594859 DOI: 10.1080/09593330.2020.1788169] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Accepted: 06/13/2020] [Indexed: 06/11/2023]
Abstract
The porous polyvinyl alcohol (PVA)/Al2O3 composite by supporting activated alumina on the cross-linked network of PVA has been successfully prepared and its property for the removal of phosphate in aqueous solution was also evaluated. The structure of the PVA/Al2O3 was examined by scanning electron microscopy. It showed that the activated alumina particles with an average size of 1 μm were evenly dispersed and fixed in the cross-linked network structure of PVA. The effects of adsorption time, solution temperature, pH, initial concentration of phosphate, Al2O3 loading rate, dosage and coexisting ions on the phosphate removal were further studied. The results showed that the highest removal phosphate efficiency of 95% can be obtained with the Al2O3 loading rate of PVA/Al2O3 being 60 wt.% at pH of 4 at 30 °C. The maximum adsorption capacities of PO43- by PVA/Al2O3 suggested by the Langmuir isothermal model was 10.12 mg/g. The adsorption process of phosphate can be fit well with a pseudo-second-order model (R2 = 0.9900). The PVA/Al2O3 composite exhibited a high selective adsorption of phosphate in the presence of commonly coexisting anions except the obvious effect of CO32- in water. Meanwhile, the PVA/Al2O3 composite can be easily separated and recovered due to the granulation of adsorbent. PVA/Al2O3 composite also shows the excellent properties of regeneration and recycling use with the removal efficiency of phosphate was 88.93%, 88.38% and 94.34% after three cycles, respectively. It can be proposed that the PVA/Al2O3 composite is a promising recyclable adsorbent for removing phosphate at low concentration from aqueous solution.
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Affiliation(s)
- Xiaohu Li
- Xiamen Engineering & Technology Research Center for Urban Water Environment Planning and Remediation, College of Civil Engineering, Huaqiao University, Xiamen, Fujian, People's Republic of China
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, Fujian, People's Republic of China
| | - Xiaoya Hu
- Xiamen Engineering & Technology Research Center for Urban Water Environment Planning and Remediation, College of Civil Engineering, Huaqiao University, Xiamen, Fujian, People's Republic of China
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, Fujian, People's Republic of China
| | - Yuzheng Fu
- Xiamen Foreign Language School, Xiamen, Fujian, People's Republic of China
| | - Huiying Ai
- Xiamen Engineering & Technology Research Center for Urban Water Environment Planning and Remediation, College of Civil Engineering, Huaqiao University, Xiamen, Fujian, People's Republic of China
| | - Ming-Lai Fu
- Xiamen Engineering & Technology Research Center for Urban Water Environment Planning and Remediation, College of Civil Engineering, Huaqiao University, Xiamen, Fujian, People's Republic of China
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, Fujian, People's Republic of China
| | - Baoling Yuan
- Xiamen Engineering & Technology Research Center for Urban Water Environment Planning and Remediation, College of Civil Engineering, Huaqiao University, Xiamen, Fujian, People's Republic of China
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Lin J, Zhao Y, Zhan Y, Wang Y. Influence of coexisting calcium and magnesium ions on phosphate adsorption onto hydrous iron oxide. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:11303-11319. [PMID: 31965506 DOI: 10.1007/s11356-020-07676-w] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2019] [Accepted: 01/07/2020] [Indexed: 06/10/2023]
Abstract
Removal of phosphorus (P) from municipal wastewater is of vital importance to the control of eutrophication in receiving freshwater bodies. Typical cations such as Ca2+ and Mg2+ generally exist in municipal wastewater, and they may affect the sorption behavior and mechanism of iron oxide-based materials for aqueous phosphate (HxPO4x - 3, x = 0, 1, 2, or 3 depending on solution pH). To better apply iron oxide-containing materials as adsorbents to eliminate HxPO4x - 3 in municipal wastewater, a hydrous ferric oxide (HFEO) was prepared and characterized at first and then the impact of coexisting Ca2+ and Mg2+ on the uptake of HxPO4x - 3 by HFEO was studied. The results showed that, without coexisting Ca2+ and Mg2+, the kinetic data for HxPO4x - 3 sorption onto HFEO were better described by the Elovich model (R2 = 0.953) than the pseudo-second-order (R2 = 0.838) and pseudo-first-order (R2 = 0.641) models, and the isotherm data were fitted better with the Dubinin-Radushkevich (R2 = 0.966) and Freundlich (R2 = 0.953) models than with the Langmuir (R2 = 0.924) model. The ligand exchange of the Fe-bound hydroxyl group with HxPO4x - 3 and the generation of Fe-O-P bonding played a key role in the uptake of HxPO4x - 3 by HFEO in the absence of Ca2+ and Mg2+. Coexisting Ca2+ and Mg2+ greatly improved the adsorptive removal of HxPO4x - 3 by HFEO, including the adsorption capacity and initial adsorption rate. According to the Langmuir isotherm equation, the predicted maximum HxPO4x - 3 adsorption capacity for HFEO at pH 7 in the presence of 2 mmol/L Ca2+ (24.7 mg P/g) or 2 mmol/L Mg2+ (18.4 mg P/g) was much larger than that without coexisting Ca2+ and Mg2+ (10.7 mg P/g). The formation of aqueous CaHPO40 and MgHPO40 species firstly and then the adsorption of the formed CaHPO40 and MgHPO40 species on the HFEO surface to generate the HPO42--bridged ternary complexes (i.e., Fe(OPO3H)Ca+ and Fe(OPO3H)Mg+) had an important role in the improvement of HxPO4x - 3 adsorption onto HFEO by coexisting Ca2+ and Mg2+.
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Affiliation(s)
- Jianwei Lin
- College of Marine Ecology and Environment, Shanghai Ocean University, Hucheng Ring Road No. 999, Shanghai, 201306, China.
| | - Yuying Zhao
- College of Marine Ecology and Environment, Shanghai Ocean University, Hucheng Ring Road No. 999, Shanghai, 201306, China
| | - Yanhui Zhan
- College of Marine Ecology and Environment, Shanghai Ocean University, Hucheng Ring Road No. 999, Shanghai, 201306, China
| | - Yan Wang
- College of Marine Ecology and Environment, Shanghai Ocean University, Hucheng Ring Road No. 999, Shanghai, 201306, China
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Qiao W, Bai H, Tang T, Miao J, Yang Q. Recovery and utilization of phosphorus in wastewater by magnetic Fe3O4/Zn-Al-Fe-La layered double hydroxides(LDHs). Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.05.046] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Almasri DA, Saleh NB, Atieh MA, McKay G, Ahzi S. Adsorption of phosphate on iron oxide doped halloysite nanotubes. Sci Rep 2019; 9:3232. [PMID: 30824719 PMCID: PMC6397243 DOI: 10.1038/s41598-019-39035-2] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2018] [Accepted: 11/15/2018] [Indexed: 12/02/2022] Open
Abstract
Excess phosphate in water is known to cause eutrophication, and its removal is imperative. Nanoclay minerals are widely used in environmental remediation due to their low-cost, adequate availability, environmental compatibility, and adsorption efficiency. However, the removal of anions with nanoclays is not very effective because of electrostatic repulsion from clay surfaces with a net negative charge. Among clay minerals, halloysite nanotubes (HNTs) possess a negatively charged exterior and a positively charged inner lumen. This provides an increased affinity for anion removal. In this study, HNTs are modified with nano-scale iron oxide (Fe2O3) to enhance the adsorption capacity of the nanosorbent. This modification allowed for effective distribution of these oxide surfaces, which are known to sorb phosphate via ligand exchange and by forming inner-sphere complexes. A detailed characterization of the raw and (Fe2O3) modified HNTs (Fe-HNT) is conducted. Influences of Fe2O3 loading, adsorbent dosage, contact time, pH, initial phosphate concentration, and coexisting ions on the phosphate adsorption capacity are studied. Results demonstrate that adsorption on Fe-HNT is pH-dependent with fast initial adsorption kinetics. The underlying mechanism is identified as a combination of electrostatic attraction, ligand exchange, and Lewis acid-base interactions. The nanomaterial provides promising results for its application in water/wastewater treatment.
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Affiliation(s)
- Dema A Almasri
- Qatar Environment and Energy Research Institute (QEERI), Hamad Bin Khalifa University (HBKU), Qatar Foundation, PO Box 34110, Doha, Qatar.,College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation, PO Box 34110, Doha, Qatar
| | - Navid B Saleh
- Department of Civil, Architectural and Environmental Engineering, University of Texas, Austin, TX, 78712, USA
| | - Muataz A Atieh
- Qatar Environment and Energy Research Institute (QEERI), Hamad Bin Khalifa University (HBKU), Qatar Foundation, PO Box 34110, Doha, Qatar. .,College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation, PO Box 34110, Doha, Qatar.
| | - Gordon McKay
- Qatar Environment and Energy Research Institute (QEERI), Hamad Bin Khalifa University (HBKU), Qatar Foundation, PO Box 34110, Doha, Qatar
| | - Said Ahzi
- Qatar Environment and Energy Research Institute (QEERI), Hamad Bin Khalifa University (HBKU), Qatar Foundation, PO Box 34110, Doha, Qatar. .,College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation, PO Box 34110, Doha, Qatar.
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