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Thermodynamics of dye adsorption on electrochemically exfoliated graphene
Xue, Zhishuang1; Zhao, Shanlin1; Zhao, Zenghua2; Li, Ping1; Gao, Jianhui1
2016-05-01
发表期刊JOURNAL OF MATERIALS SCIENCE
ISSN0022-2461
卷号51期号:10页码:4928-4941
摘要

Graphene sheets prepared by electrochemical exfoliation have been used for the adsorption of methylene blue (MB), a cationic dye from aqueous solution. The maximum adsorbed amount of MB on exfoliated graphene (EG) reaches 511.7 mg g(-1) when the initial concentration of MB is 500 mg L-1, with EG whose dosage is 10 mg. Further study on the adsorption mechanism of EG includes isothermal adsorption equilibrium, thermodynamics, and kinetics. The study on isothermal adsorption equilibrium shows that the adsorption follows the Langmuir isotherm. Various thermodynamic parameters such as Gibbs free energy (Delta G(0)), enthalpy (Delta H-0), and entropy (Delta S-0) change were also evaluated. It indicates that the adsorption is a spontaneous, endothermic, and physical adsorption process. The kinetic data reveals that the adsorption process of MB fits well with the pseudo second-order model. The Weber's intra-particle diffusion model demonstrates that the adsorption rate is controlled by both external diffusion and intra-particle diffusion. EG as a cationic dye scavenger displays high speed and efficiency.

关键词Methylene-blue Aqueous-solution Oxide Removal Equilibrium Composite Kinetics Biosorption Reduction Mechanism
文章类型Article
WOS标题词Science & Technology ; Technology
DOI10.1007/s10853-016-9798-6
URL查看原文
收录类别SCI
语种英语
关键词[WOS]Methylene-blue ; Aqueous-solution ; Oxide ; Removal ; Equilibrium ; Composite ; Kinetics ; Biosorption ; Reduction ; Mechanism
WOS研究方向Materials Science
WOS类目Materials Science, Multidisciplinary
项目资助者Science and Technology Department of Liaoning Province(2011223011)
WOS记录号WOS:000372573000019
引用统计
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/20654
专题研究所(批量导入)
通讯作者Li, Ping
作者单位1.Liaoning Shihua Univ, Sch Chem Chem Engn & Environm Engn, Fushun 113001, Liaoning, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
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GB/T 7714
Xue, Zhishuang,Zhao, Shanlin,Zhao, Zenghua,et al. Thermodynamics of dye adsorption on electrochemically exfoliated graphene[J]. JOURNAL OF MATERIALS SCIENCE,2016,51(10):4928-4941.
APA Xue, Zhishuang,Zhao, Shanlin,Zhao, Zenghua,Li, Ping,&Gao, Jianhui.(2016).Thermodynamics of dye adsorption on electrochemically exfoliated graphene.JOURNAL OF MATERIALS SCIENCE,51(10),4928-4941.
MLA Xue, Zhishuang,et al."Thermodynamics of dye adsorption on electrochemically exfoliated graphene".JOURNAL OF MATERIALS SCIENCE 51.10(2016):4928-4941.
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