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Adsorptive removal of methylene blue by rhamnolipid-functionalized graphene oxide from wastewater

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成果类型:
期刊论文
作者:
Wu, Zhibin;Zhong, Hua;Yuan, Xingzhong*;Wang, Hou;Wang, Lele;Chen, Xiaohong;Zeng, Guangming;Wu, Yan
通讯作者:
Yuan, Xingzhong
作者机构:
[Zeng, Guangming; Yuan, Xingzhong; Wang, Hou; Wu, Zhibin; Zhong, Hua] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.
[Zeng, Guangming; Yuan, Xingzhong; Wang, Hou; Wu, Zhibin; Zhong, Hua; Wang, Lele] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Hunan, Peoples R China.
[Zhong, Hua] Univ Arizona, Dept Soil Water & Environm Sci, Tucson, AZ 85719 USA.
[Chen, Xiaohong] Cent S Univ, Sch Business, Changsha 410083, Hunan, Peoples R China.
[Wu, Yan] S China Univ Technol, Coll Environm & Energy, Guangzhou 510006, Guangdong, Peoples R China.
通讯机构:
[Yuan, Xingzhong] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.
语种:
英文
关键词:
Adsorption;Rhamnolipid-functionalized graphene oxide;Methylene blue;Adsorption kinetics;Adsorption isotherms
期刊:
Water Research
ISSN:
0043-1354
年:
2014
卷:
67
页码:
330-344
文献类别:
WOS:Article;EI:Journal article (JA)
所属学科:
ESI学科类别:环境科学/生态学;WOS学科类别:Engineering, Environmental;Environmental Sciences;Water Resources
入藏号:
WOS:000346394900030;EI:20144300124283
基金类别:
National Natural Science Foundation of China [501100001809, 21276069, 51378192, 71431006]; Fundamental Research Funds for the Central Universities; Hunan Province Innovation Foundation for Postgraduate [CX2014B142]; Collaborative Innovation Center of Resource conserving & Environment-friendly Society and Ecological Civilization-China
机构署名:
本校为其他机构
院系归属:
商学院
摘要:
In this article, a rhamnolipid-functionalized graphene oxide (RL-GO) hybrid was prepared by one-step ultrasonication and adsorptive removal of methylene blue (MB) from both artificial and real wastewater by the RL-GO was investigated. The Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Fourier transform infrared spectrum (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Brunauer Emmett Teller (BET) area and Zeta potential analysis were used to characterize the adsorbent. The results showed that EL-GO had abundant functional groups and a mesopores feature. MB adsorption by the RL-GO increased with increase in adsorbent dose, pH, temperature and initial MB concentration, while it was insensitive to ionic strength variation. The adsorption kinetics fitted well to the pseudo-second-order model with correlation coefficients greater than 0.999. The Intra-particle diffusion and Boyd's film-diffusion models showed that the rate-controlled step was dominated by film-diffusion in the beginning and then followed by intra-particle diffusion. The adsorption isotherm was fitted by adsorption models with the suitability in order of BET > Freundlich > Langmuir > Temkin, based on comparison between correlation coefficients. Thermodynamic analysis of equilibriums suggested that the adsorption MB on RL-GO was spontaneous and endothermic. The adsorption mechanism was also proposed to be electrostatic attraction, pi-pi interaction and hydrogen bond. In addition, the real wastewater experiment, the regeneration study and the comparative cost analysis showed that the RL-GO composites could be a cost-effective and promising sorbent for MB wastewater treatment owing to its high efficiency and excellent reusability. (C) 2014 Elsevier Ltd. All rights reserved.
参考文献:
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