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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
Source PublicationJOURNAL OF MATERIALS SCIENCE
ISSN0022-2461
Volume51Issue:10Pages:4928-4941
Abstract

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.

KeywordMethylene-blue Aqueous-solution Oxide Removal Equilibrium Composite Kinetics Biosorption Reduction Mechanism
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1007/s10853-016-9798-6
URL查看原文
Indexed BySCI
Language英语
WOS KeywordMethylene-blue ; Aqueous-solution ; Oxide ; Removal ; Equilibrium ; Composite ; Kinetics ; Biosorption ; Reduction ; Mechanism
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Multidisciplinary
Funding OrganizationScience and Technology Department of Liaoning Province(2011223011)
WOS IDWOS:000372573000019
Citation statistics
Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/20654
Collection研究所(批量导入)
Corresponding AuthorLi, Ping
Affiliation1.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
Recommended Citation
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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