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Biochar pyrolyzed from MgAl-layered double hydroxides pre-coated ramie biomass (Boehmeria nivea (L.) Gaud.): Characterization and application for crystal violet removal

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WOS被引频次:22
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成果类型:
期刊论文
作者:
Tan, Xiao-fei;Liu, Yun-guo*;Gu, Yan-ling;Liu, Shao-bo;Zeng, Guang-ming;Cai, Xiaoxi;Hu, Xin-jiang;Wang, Hui;Liu, Si-mian;Jiang, Lu-hua
通讯作者:
Liu, Yun-guo
作者机构:
[Gu, Yan-ling; Jiang, Lu-hua; Liu, Yun-guo; Cai, Xiaoxi; Wang, Hui; Liu, Si-mian; Tan, Xiao-fei; Hu, Xin-jiang; Zeng, Guang-ming] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.
[Gu, Yan-ling; Jiang, Lu-hua; Liu, Yun-guo; Cai, Xiaoxi; Wang, Hui; Liu, Si-mian; Tan, Xiao-fei; Hu, Xin-jiang; Zeng, Guang-ming] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Hunan, Peoples R China.
[Liu, Shao-bo] Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China.
[Liu, Shao-bo] Cent S Univ, Sch Architecture & Art, Changsha 410083, Hunan, Peoples R China.
[Hu, Xin-jiang] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn Res, Changsha 410004, Hunan, Peoples R China.
通讯机构:
[Liu, Yun-guo] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.
语种:
英文
关键词:
Biochar;MgAl-layered double hydroxides;Composite;Ramie (Boehmeria nivea (L.) Gaud.);Crystal violet
期刊:
Journal of Environmental Management
ISSN:
0301-4797
年:
2016
卷:
184
页码:
85-93
文献类别:
WOS:Article
所属学科:
ESI学科类别:环境科学/生态学;WOS学科类别:Environmental Sciences
入藏号:
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:
A novel biochar/MgAl-layered double hydroxides composite (CB-LDH) was prepared for the removal of crystal violet from aqueous solution by pyrolyzing MgAI-LDH pre-coated ramie stem (Boehmeria nivea (L.) Gaud.). Pyrolysis played dual role for both converting biomass into biochar and calcining MgAl-LDH during the pyrolysis process. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray analysis (EDS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) and zeta potential analysis were used to characterize the CB-LDH. The results of characterization suggested that the calcined LDH was successfully synthesized and coated on biochar. The resulted CB-LDH had higher total pore volume and more functional groups than the pristine biochar. Adsorption experimental data fitted well with the pseudo-second order kinetics model and the Freundlich isotherm model. The rate-controlled step was controlled by film-diffusion initially and then followed by intra-particle diffusion. Thermodynamic analysis showed that the adsorption of crystal violet was a spontaneous and endothermic process. The higher pH and temperature of the solution enhanced the adsorption performance.. CB-LDH could also have excellent ability for the removal of crystal violet from the actual industrial wastewater and groundwater with high ionic strength. LDH adsorption, electrostatic attraction, pore-filling, pi-pi ir interaction and hydrogen bond might be the main mechanisms for crystal violet adsorption on CB-LDH. The results of this study indicated that CB-LDH is a sustainable and green adsorbent with high performance for crystal violet contaminated wastewater treatment and groundwater remediation. (C) 2016 Elsevier Ltd. All rights reserved.
参考文献:
Ahmed IM, 2012, APPL SURF SCI, V259, P650, DOI 10.1016/j.apsusc.2012.07.092
Ai LH, 2011, J CHEM ENG DATA, V56, P4217, DOI 10.1021/je200743u
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