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
作者： Xue, Lihong 1 ; Gao, Bin 2 ; Wan, Yongshan 3 ; Fang, June 2 ; Wang, Shengsen 2 ; Li, Yuncong 3 ; Munoz-Carpena, Rafael 2 ;
作者机构： 1.Jiangsu Acad Agr Sci, Nanjing 210014, Jiangsu, Peoples R China
2.Univ Florida, Dept Agr & Biol Engn, Gainesville, FL 32611 USA
3.Univ Florida, Dept Soil & Water Sci, Gainesville, FL 32611 USA
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.
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