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Investigation of the adsorption-reduction mechanisms of hexavalent chromium by ramie biochars of different pyrolytic temperatures

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WOS被引频次:79
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成果类型:
期刊论文
作者:
Zhou, Lu;Liu, Yunguo*;Liu, Shaobo;Yin, Yicheng;Zeng, Guangming;Tan, Xiaofei;Hu, Xi;Hu, Xinjiang;Jiang, Luhua;Ding, Yang;Liu, Shaoheng;Huang, Xixian
通讯作者:
Liu, Yunguo
作者机构:
[Zhou, Lu; Liu, Yunguo; Zeng, Guangming; Jiang, Luhua; Tan, Xiaofei; Hu, Xinjiang; Yin, Yicheng; Liu, Shaoheng; Ding, Yang; Huang, Xixian] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.
[Zhou, Lu; Liu, Yunguo; Zeng, Guangming; Jiang, Luhua; Tan, Xiaofei; Hu, Xinjiang; Yin, Yicheng; Liu, Shaoheng; Ding, Yang; Huang, Xixian] Hunan Univ, Key Lab Environm Biol & Pollut Control, Minist Educ, Changsha 410082, Hunan, Peoples R China.
[Liu, Shaobo] Cent S Univ, Coll Architecture & Art, Changsha 410082, Hunan, Peoples R China.
[Hu, Xi] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn Res, Changsha 410004, 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
关键词:
Ramie residues;Biochar;Pyrolysis temperature;Chromium;Mechanisms
期刊:
Bioresource Technology
ISSN:
0960-8524
年:
2016
卷:
218
页码:
351-359
文献类别:
WOS:Article;EI:Journal article (JA)
所属学科:
ESI学科类别:生物学与生物化学;WOS学科类别:Agricultural Engineering;Biotechnology & Applied Microbiology;Energy & Fuels
入藏号:
WOS:000384710500047;EI:20162702560226
机构署名:
本校为其他机构
院系归属:
建筑与艺术学院
摘要:
To investigate the relationship between Cr(VI) adsorption mechanisms and physio-chemical properties of biochar, ramie residues were oxygen-limited pyrolyzed under temperature varying from 300 to 600 degrees C. Batch adsorption experiments indicated that higher pyrolysis temperature limits Cr(VI) sorption in terms of capacity and affinity due to a higher aromatic structure and fewer polar functional groups in biochar. Both electrostatic (physical) and ionic (chemical) interactions were involved in the Cr(VI) removal. For low-temperature biochar, the simple physical adsorption was limited and the significant improvement in Cr(VI) sorption was attributed to abundant carboxyl and hydroxyl groups. The adsorption-reduction mechanisms could be concluded that Cr(VI) ions were electrostatically attracted by the positively charged biochar surface and reduced to Cr(III), and then the converted Cr(III) was retained or discharged into the solution. The study demonstrates ramie residues can be converted into biochar as a low-cost and effective sorbent for Cr(VI) removal. (C) 2016 Elsevier Ltd. All rights reserved.
参考文献:
Ahmad M, 2012, BIORESOURCE TECHNOL, V118, P536, DOI 10.1016/j.biortech.2012.05.042
Al-Othman ZA, 2012, CHEM ENG J, V184, P238, DOI 10.1016/j.cej.2012.01.048
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Albadarin AB, 2012, CHEM ENG J, V179, P193, DOI 10.1016/j.cej.2011.10.080
Arslan G, 2007, BIORESOURCE TECHNOL, V98, P2836, DOI 10.1016/j.biortech.2006.09.041

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