Comparison of the adsorption of cationic blue onto graphene oxides prepared from natural graphites with different graphitization degrees

The typical thickness was approximately 1.180nm for GO-VG, 1.050nm for GO-LG, 0.986nm for GO-FG, and 0.925nm for GO-FG, while the thickness of routinely synthesized single GO sheets ranged from 0.7–1.2nm. Specifically, the sheets with a thickness less than 2nm totaled 60.05% for GO-VG, 69.18% for GO...

Full description

Saved in:
Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2017-09, Vol.529, p.292-301
Main Authors: Jiao, Xuan, Zhang, Lingyan, Qiu, Yangshuai, Guan, Junfang
Format: Article
Language:English
Subjects:
Adsorption
Cationic blue
Graphene oxide
Graphitization degree
Natural graphite
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The typical thickness was approximately 1.180nm for GO-VG, 1.050nm for GO-LG, 0.986nm for GO-FG, and 0.925nm for GO-FG, while the thickness of routinely synthesized single GO sheets ranged from 0.7–1.2nm. Specifically, the sheets with a thickness less than 2nm totaled 60.05% for GO-VG, 69.18% for GO-LG, 74.25% for GO-FG, and 84.79% for GO-AG. [Display omitted] •To use graphites with various graphitization degrees to prepare graphene oxides (GOs).•To evaluated the influence of graphitization degrees of different natural graphites on the characteristics of GOs.•To compare the adsorption behavior of cationic blue on the different types of GOs. In this study, comparative experiments were conducted on the adsorption of cationic blue onto graphene oxides (GOs) synthesized by graphites with various graphitization degrees. XRD, XPS, FT-IR, Raman, AFM and BET were used to characterize the prepared GOs. The results demonstrated that graphites with lower graphitization degrees were more easily oxidized, and GOs prepared from those graphites had more oxygen-containing groups, higher degrees of defects, thinner layers and higher specific surface areas. The equilibrium data was in better agreement with the Langmuir model than both the Freundlich model and the Temkin model. In addition, the adsorption of cationic blue on the GOs was well-described by the pseudo-second order kinetics model according to the kinetic experiments. Moreover, the thermodynamic parameters demonstrated that the adsorption was both an endothermic and spontaneous process.
ISSN:0927-7757
1873-4359
DOI:10.1016/j.colsurfa.2017.05.094