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Effective removal of Cr(VI) using β-cyclodextrin-chitosan modified biochars with adsorption/reduction bifuctional roles

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WOS被引频次:64
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成果类型:
期刊论文
作者:
Huang, Xixian;Liu, Yunguo*;Liu, Shaobo;Tan, Xiaofei;Ding, Yang;Zeng, Guangming;Zhou, Yaoyu;Zhang, Mingming;Wang, Shufan;Zheng, Bohong
通讯作者:
Liu, Yunguo
作者机构:
[Wang, Shufan; Liu, Yunguo; Zeng, Guangming; Tan, Xiaofei; Zhou, Yaoyu; Ding, Yang; Huang, Xixian; Zhang, Mingming] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.
[Wang, Shufan; Liu, Yunguo; Zeng, Guangming; Tan, Xiaofei; Zhou, Yaoyu; Ding, Yang; Huang, Xixian; Zhang, Mingming] Hunan Univ, Key Lab Environm Biol & Pollut Control, Minist Educ, Changsha 410082, Hunan, Peoples R China.
[Liu, Shaobo] Cent S Univ, Sch Met & Environm, Changsha 410082, Hunan, Peoples R China.
[Liu, Shaobo; Zheng, Bohong] Cent S Univ, Sch Architecture & Art, Changsha 410082, Hunan, Peoples R China.
通讯机构:
[Liu, Yunguo] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.
语种:
英文
期刊:
RSC Advances
ISSN:
2046-2069
年:
2015
文献类别:
WOS:Article;EI:Journal article (JA)
所属学科:
ESI学科类别:化学;WOS学科类别:Chemistry, Multidisciplinary
入藏号:
WOS:000367250900014;EI:20160101752759
机构署名:
本校为其他机构
院系归属:
冶金与环境学院
建筑与艺术学院
摘要:
In this work, beta-cyclodextrin-chitosan modified walnut shell biochars (&beta;-CCWB) were synthesized as a low-cost adsorbent for the removal of heavy metal Cr(vi) from aqueous solutions. Batch sorption experiments were carried out to investigate the adsorption characteristic of &beta;-CCWB. The experimental data fitted a pseudo-second order equation and Freundlich isotherm model, and the optimum adsorption of the modified biochar was observed at pH 2.0 with an adsorption capacity of 206 mg g<sup>-1</sup>. Thermodynamic analysis showed that the adsorption process was spontaneous and endothermic. The removal efficiency of Cr(vi) by &beta;-CCWB (about 93%) was higher than that by the pristine biochar (about 27%). Characteristic analysis indicated that amino and carboxyl groups were the major functional groups for Cr(vi) sorption, and implied that the electrostatic attraction of Cr(vi) to the positively charged biochar surface, reduction of Cr(vi) to Cr(iii) ions and the complexation between Cr(iii) ions and &beta;-CCWB functional groups were responsible for Cr(vi) removal mechanism in this research. Furthermore, the environmentally friendly and low-cost &beta;-CCWB could be applied as a potential effective adsorbent to remediate Cr(vi) contamination from aqueous solution. &copy;2016 The Royal Society of Chemistry.
参考文献:
Agrafioti E, 2014, J ENVIRON MANAGE, V146, P444, DOI 10.1016/j.jenvman.2014.07.029
Agrafioti E, 2014, J ENVIRON MANAGE, V133, P309, DOI 10.1016/j.jenvman.2013.12.007
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