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Open AccessArticle

Synthesis of Fe/Mg-Biochar Nanocomposites for Phosphate Removal

by Xuefeng Tao 1,2,*, Tao Huang 1 and Bo Lv 2
Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China
Chongqing Municipal Research Institute of Design, Chongqing 400020, China
Author to whom correspondence should be addressed.
Materials 2020, 13(4), 816;
Received: 6 December 2019 / Revised: 5 February 2020 / Accepted: 7 February 2020 / Published: 11 February 2020
(This article belongs to the Collection Advanced Biomass-Derived Carbon Materials)
Magnetic biochar derived from agricultural biomass has been recognized as a cost-effective biochar sorbent for phosphate removal. This study evaluated the use of novel Fe/Mg-biochar nanocomposites (WBC1x), prepared by impregnating ground walnut shell in a solution with a different molar ratio of Fe2+ to Mg2+, then pyrolyzing slowly, at a temperature of 600 °C, to remove phosphate. The results showed that MgO and Fe3O4 were loaded onto the biochar successfully through the impregnation-pyrolysis method and the composites were able to be separated easily by magnetic field. Meanwhile, a higher surface area and point of zero charge on WBC1x were observed compared to the non-magnetic biochar (WBC). Moreover, the isothermal adsorption and kinetics data further suggested the that phosphate adsorption onto WBC1x resulted from chemisorption. Additionally, the maximum phosphate adsorption capacity of WBC1x was 6.9 mg.g−1, obtained though the Langmuir–Freundlich model, which was threefold higher than WBC, where MgO addition could enhance the adsorption capacity of WBC1x markedly by improving the surface charge. View Full-Text
Keywords: Fe/Mg-biochar nanocomposites; phosphate removal; biochar Fe/Mg-biochar nanocomposites; phosphate removal; biochar
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Tao, X.; Huang, T.; Lv, B. Synthesis of Fe/Mg-Biochar Nanocomposites for Phosphate Removal. Materials 2020, 13, 816.

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