High efficiency and selectivity of MgFe-LDH modified wheat-straw biochar in the removal of nitrate from aqueous solutions

文献类型： 外文期刊

第一作者： Xue, Lihong

作者： Xue, Lihong;Yang, Linzhang;Xue, Lihong;Gao, Bin;Fang, June;Wang, Shengsen;Munoz-Carpena, Rafael;Wan, Yongshan;Li, Yuncong

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关键词： Engineered biochar;Layered double hydroxides;Nitrate adsorption;Ion selectivity

期刊名称：JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS （ 影响因子：5.876； 五年影响因子：5.294 ）

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收录情况： SCI

摘要： Mg-Fe layered double hydroxide (MgFe-LDH) particles were incorporated into wheat-straw biochar by liquid-phase deposition. The obtained biochar/MgFe-LDH composite was used to remove nitrate from aqueous solutions. X-ray diffraction patterns demonstrated that LDH particles were successfully deposited onto the carbon surface within the biochar matrix. Adsorption kinetic and isotherm studies and the effects of co-existing anions and adsorbents dosages were investigated using laboratory batch sorption experiments. The biochar/MgFe-LDH composite showed a strong sorption ability to nitrate in aqueous solutions with the Langmuir maximum adsorption capacity of 24.8 mg/g. A high selectivity for nitrate of the biochar/MgFe-LDH composite was also observed irrespective of the co-existence of sulfate and phosphate. The biochar/MgFe-LDH composite can thus be potentially used as an alternative adsorbent for the treatment of nitrate-contaminated waters as well as a soil amendment for the reduction of soil nitrate leaching. (C) 2016 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

分类号： TQ

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