The sorbed mechanisms of engineering magnetic biochar composites on arsenic in aqueous solution
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RESEARCH ARTICLE
The sorbed mechanisms of engineering magnetic biochar composites on arsenic in aqueous solution Zulqarnain Haider Khan 1,2 & Minling Gao 3 & Weiwen Qiu 4 & Muhammad Qaswar 2,5 & Md. Shafiqul Islam 1,2 & Zhengguo Song 3 Received: 15 February 2020 / Accepted: 8 July 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The aim of this study was to produce magnetic biochar for the removal of As (III) from the aquatic environment. Magnetic biochar (MBC) was prepared from corn straw‑derived biochar. Pristine biochar (BC) was impregnated with iron oxide and relative analyses were performed on the adsorption capacity of BC’s and MBC’s. After impregnation, the specific surface area of MBC800-0.6300 increased from 79.66 to 309.7 m2 g−1 and superparamagnetic magnetization was about 9.75 emu g−1 contributed by the contained Fe3O4. Results of MBC800-0.6300 showed maximum adsorption capacity (Qmax) 22.94 mg g−1 for As (III) based on Langmuir model which is 5.71 times higher than the adsorption capacity of BC800 (4.02 mg g−1). The adsorption of As (III) increased significantly due to the successful loading of iron oxide and the increased oxygen functional groups that were confirmed by XPS and FTIR results. The removal of As (III) followed Langmuir isotherm model and pseudo-second-order (R2 ≥ 0.99), indicated that the adsorption rate was monolayer and depended on the chemical adsorption process, respectively. Consequently, the simple preparation procedure and high adsorption performance suggest that MBC800-0.6300 could be used as an environment-friendly and extremely effective adsorbent for As (III) removal from aqueous environment. Keywords As (III) . Magnetic biochar . Adsorption . Fe3O4 . Water remediation
Introduction Arsenic contamination of water has become a worldwide problem and gained huge attention due to its hazardous effects Responsible editor: Zhihong Xu Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-10082-x) contains supplementary material, which is available to authorized users. * Zhengguo Song [email protected] 1
Agro-Environmental Protection Institute, Ministry of Agriculture of China, Tianjin 300191, China
2
Chinese Academy of Agricultural Sciences, Beijing 100081, China
3
Department of Civil and Environmental Engineering, Shantou University, Shantou 515063, China
4
The New Zealand Institute for Plant and Food Research Limited, Private Bag 4704, Christchurch 8140, New Zealand
5
National Engineering Laboratory for Improving Quality of Arable Land, Institute of Agricultural Resources and Regional Planning, Beijing, China
on human health. Intake of arsenic polluted water and arseniccontaminated agricultural products for long time containing arsenic concentration above the safe limit (0.01 mg L−1) becomes very hazardous for human metabolism; such as neurological and cardiovascular systems damage, an endocrine disorder, and increase cancer risks, especially for the lungs, skin, and liver cancer (WHO 2011).
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