Removal of hexavalent chromium from aqueous solution by different surface-modified biochars: Acid washing, nanoscale zero-valent iron and ferric iron loading

被引:123
作者
Zhu, Yuen [1 ]
Li, Hua [2 ]
Zhang, Guixiang [3 ]
Meng, Fanjian [2 ]
Li, Lifen [2 ]
Wu, Shan [4 ,5 ]
机构
[1] Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Beijing 100875, Peoples R China
[2] Shanxi Univ, Sch Environm & Resources, Taiyuan 030006, Shanxi, Peoples R China
[3] Taiyuan Univ Sci & Technol, Coll Environm & Safety, Taiyuan 030024, Shanxi, Peoples R China
[4] Nanchang Univ, Sch Resource Environm & Chem Engn, Minist Educ, Poyang Lake Key Lab Environm & Resource Utilizat, Nanchang 330031, Jiangxi, Peoples R China
[5] Guangdong Inst Ecoenvironm Sci & Technol, Guangzhou 510650, Guangdong, Peoples R China
基金
国家重点研发计划;
关键词
Hexavalent chromium; Modified biochar; Reduction; Mechanism; ZEROVALENT IRON; CR(VI) REMOVAL; WATER; ADSORPTION; CARBON; MECHANISMS; REDUCTION; SORPTION; SOIL; VI;
D O I
10.1016/j.biortech.2018.04.004
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
Willow residue biochar (BC) and modified biochars (hydrochloric acid washing (HBC), HBC loaded with nanoscale zero-valent iron (nZVI-HBC), and HBC loaded with ferric iron (Fe3+-HBC)) after aging were used for aqueous Cr(VI) removal. HBC (> 98.67%), nZVI-HBC (> 98.86%), and Fe3+-HBC (> 99.64%) kept high Cr(VI) removal rates under the acidic conditions within a wide pH range (< 7.0), indicating their good adaptability to pH change because of aging. Cr(VI) reduction to Cr(III) was the dominant removal mechanism. The formation of eCOOH on BC, HBC, and nZVI-HBC indicates the oxidation of surface functional groups by Cr(VI) and simultaneous Cr(VI) reduction. The disappearance of nZVI peaks indicates the reduction of Cr(VI) to Cr(III) by nZVI. The color reaction result demonstrated that the converted Fe2+ in Fe3+-HBC contributed to Cr(VI) reduction. Taking into account the removal efficiency, recyclability, cost, preparation process, and stability of adsorbents, Fe3+-HBC was recommended for Cr(VI) removal.
引用
收藏
页码:142 / 150
页数:9
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