Nanoscale zero-valent iron particles supported on sludge-based biochar for the removal of chromium (VI) from aqueous system

被引：0
作者：
Xi Chen
Guangjian Fan
Haibo Li
Yinghua Li
Ran Zhang
Yu Huang
Xinyang Xu
机构：
[1] Northeastern University,School of Resources and Civil Engineering
来源：
Environmental Science and Pollution Research | 2022年 / 29卷
关键词：
Municipal sewage sludge; Biochar; Nanoscale zero-valent iron; Cr(VI) removal; Reduction; Fe(III)-Cr(III) co-precipitant;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Biochar (BC) obtained by the co-pyrolysis of municipal sewage sludge (MSS) and sunflower seed shells (SSS) was utilized to support nanoscale zero-valent iron particles (nZVI) for the synthesis of a composite material (nZVI-BC) for Cr(VI) removal from aqueous systems. A series of characterization methods confirmed successful immobilization of nZVI on the surface of biochar with no aggregation. Batch experiments showed that the initial pH, initial Cr(VI) concentration, and nZVI-BC dose all significantly affected the Cr(VI) removal using nZVI-BC. The kinetics for Cr(VI) removal via nZVI-BC could be better explained by the pseudo-second-order (PSO) adsorption model. Adsorption isotherms analysis demonstrated the superior Cr(VI) removal capability of nZVI-BC in comparison to bare nZVI and BC. nZVI-BC can be reused after the regeneration process by applying 0.1 M H2SO4 and 0.1 M NaBH4 solutions. The reaction mechanism for Cr(VI) removal might involve its chemical reduction on the nZVI-BC surface. Overall, environmentally friendly nZVI-BC was highly efficient in Cr(VI) removal from aqueous systems.
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页码：3853 / 3863
页数：10
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