Efficiency of a novel nitrogen-doped Fe3O4 impregnated biochar (N/Fe3O4@BC) for arsenic (III and V) removal from aqueous solution: Insight into mechanistic understanding and reusability potential |
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| Institution: | 1. Multiscale Computational Materials Facility, Key Laboratory of Eco-Materials Advanced Technology, College of Materials Science and Engineering, Fuzhou University, Fuzhou 350100, China;2. Department of Chemistry, University of Chakwal, Pakistan;3. National Higher School of Chemistry (NHSC), University Ibn Tofail, BP. 133-14000, Kenitra, Morocco;4. Laboratory of Advanced Materials and Process Engineering (LAMPE), Faculty of Science, Ibn Tofail University, BP 133, 14000, Kenitra, Morocco;5. College of Agricultural and Environmental Sciences, Makerere University, Uganda;6. Laboratoire Matériaux et Environnement LME, Faculté des Sciences, Université Ibn Zohr, BP 8106, Cité Dakhla, Agadir, Morocco;7. Department of Chemical Engineering, Universitat Rovira i Virgili, 43007, Tarragona, Spain;8. Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen, China;9. Institute for Advanced Study, Shenzhen University, Shenzhen, Guangdong 518060, China;10. School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China;11. Department of Chemical Engineering, Khwaja Fareed University of Engineering and Information Technology, Rahim Yar Khan 64200, Pakistan;12. Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, College of Urban and Environmental Sciences, Northwest University, Xian, Shaanxi 710127, China;13. School of Material Science and Engineering, Northwestern Polytechnical University, 71002, Xian, China;14. Department of Agronomy, University of Agriculture, Faisalabad 38000, Pakistan;15. Department of Environmental Sciences & Engineering, Government College University Faisalabad, Pakistan;p. College of Economics and Management, Jilin Agricultural University Changchun, Jilin, China;q. College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, Zhejiang, China;r. College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China;s. Materials Design and Manufacture Simulation Facility, School of Advance Manufacturing, Fuzhou University, Jinjiang 362200, China;t. National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, 10012, Beijing, China;u. School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xian, China |
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| Abstract: | Worldwide, arsenic contamination has become a matter of extreme importance owing to its potential toxic, carcinogenic and mutagenic impact on human health and the environment. The magnetite-loaded biochar has received increasing attention for the removal of arsenic (As) in contaminated water and soil. The present study reports a facile synthesis, characterization and adsorption characteristics of a novel magnetite impregnated nitrogen-doped hybrid biochar (N/Fe3O4@BC) for efficient arsenate, As(V) and arsenite, As(III) removal from aqueous environment. The as-synthesized material (N/Fe3O4@BC) characterization via XRD, BET, FTIR, SEM/EDS clearly revealed magnetite (Fe3O4) impregnation onto biochar matrix. Furthermore, the adsorbent (N/Fe3O4@BC) selectivity results showed that such a combination plays an important role in targeted molecule removal from aqueous environments and compensates for the reduced surface area. The maximum monolayer adsorption (Qmax) of developed adsorbent (N/Fe3O4@BC) (18.15 mg/g and 9.87 mg/g) was significantly higher than that of pristine biochar (BC) (9.89 & 8.12 mg/g) and magnetite nano-particles (MNPs) 7.38 & 8.56 mg/g] for both As(III) and As(V), respectively. Isotherm and kinetic data were well fitted by Langmuir (R2 = 0.993) and Pseudo first order model (R2 = 0.992) thereby indicating physico-chemical sorption as a rate-limiting step. The co-anions (PO43-) effect was more significant for both As(III) and As (V) removal owing to similar outer electronic structure. Mechanistic insights (pH and FTIR spectra) further demonstrated the remarkable contribution of surface groups (OH–, –NH2 and –COOH), electrostatic attraction (via H- bonds), surface complexation and ion exchange followed by external mass transfer diffusion and As(III) oxidation into As(V) by (N/Fe3O4@BC) reactive oxygen species. Moreover, successful desorption was achieved at varying rates up to 7th regeneration cycle thereby showing (N/Fe3O4@BC) potential practical application. Thus, this work provides a novel insight for the fabrication of novel magnetic biochar for As removal from contaminated water in natural, engineering and environmental settings. |
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| Keywords: | Adsorption Arsenic Engineered adsorbents Biochar Desorption Water contamination |
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