Fabrication and evaluation of silica embedded and zerovalent iron composited biochars for arsenate removal from water
Article
Article Title | Fabrication and evaluation of silica embedded and zerovalent iron composited biochars for arsenate removal from water |
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ERA Journal ID | 5823 |
Article Category | Article |
Authors | Ahmad, Munir (Author), Usman, Adel R.A. (Author), Hussain, Qaiser (Author), Al-Farraj, Abdullah S.F. (Author), Tsang, Yiu Fai (Author), Bundschuh, Jochen (Author) and Al-Wabel, Mohammad I. (Author) |
Journal Title | Environmental Pollution |
Journal Citation | 266 (Part 1), pp. 1-10 |
Article Number | 115256 |
Number of Pages | 10 |
Year | 2020 |
Publisher | Elsevier |
Place of Publication | Germany |
ISSN | 0269-7491 |
1873-6424 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.envpol.2020.115256 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0269749120330578 |
Abstract | Waste date palm-derived biochar (DPBC) was modified with nano-zerovalent iron (BC-ZVI) and silica (BC-SiO2) through mechanochemical treatments and evaluated for arsenate (As(V)) removal from water. The feedstock and synthesized adsorbents were characterized through proximate, ultimate, and chemical analyses for structural, surface, and mineralogical compositions. BC-ZVI demonstrated the highest surface area and contents of C, N, and H. A pH range of 2–6 was optimum for BC-ZVI (100% removal), 3–6 for DPBC (89% removal), and 4–6 for BC-SiO2 (18% removal). Co-occurring PO43− and SO42− ions showed up to 100% reduction, while NO3− and Cl− ions resulted in up to 26% reduction in As(V) removal. Fitness of the Langmuir, Freundlich and Redlich-Peterson isotherms to As(V) adsorption data suggested that both mono- and multi-layer adsorption processes occurred. BC-ZVI showed superior performance by demonstrating the highest Langmuir maximum adsorption capacity (26.52 mg g−1), followed by DPBC, BC-SiO2, and commercial activated carbon (AC) (7.33, 5.22, and 3.28 mg g−1, respectively). Blockage of pores with silica particles in BC-SiO2 resulted in lower As(V) removal than that of DPBC. Pseudo-second-order kinetic model fitted well with the As(V) adsorption data (R2 = 0.99), while the Elovich, intraparticle diffusion, and power function models showed a moderate fitness (R2 = 0.53–0.93). The dynamics of As(V) adsorption onto the tested adsorbents exhibited the highest adsorption rates for BC-ZVI. As(V) adsorption onto the tested adsorbents was confirmed through post-adsorption FTIR, SEM-EDS, and XRD analyses. Adsorption of As(V) onto DPBC, BC-SiO2, and AC followed electrostatic interactions, surface complexation, and intraparticle diffusion, whereas, these mechanisms were further abetted by the higher surface area, nano-sized structure, and redox reactions of BC-ZVI. |
Keywords | Arsenate removal, Engineered biochar, Redox reaction, Removal mechanism, Isotherm |
ANZSRC Field of Research 2020 | 400411. Water treatment processes |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | King Saud University, Saudi Arabia |
Pir Mehr Ali Shah Arid Agriculture University, Pakistan | |
Education University of Hong Kong, China | |
University of Southern Queensland | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q76w0/fabrication-and-evaluation-of-silica-embedded-and-zerovalent-iron-composited-biochars-for-arsenate-removal-from-water
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