title: Physical and chemical activation of reduced graphene oxide for enhanced adsorption and catalytic oxidation.
abstract: Physical and chemical activation of reduced graphene oxide (RGO) using different reagents, CO2, ZnCl2 and CO2/ZnCl2, to obtain highly porous and metal-free carbonaceous materials was carried out and their adsorption and catalytic behavior were investigated. Physical activation using CO2 was proved to be much more effective than chemical ZnCl2 activation, and increased the specific surface area (SSA) of RGO from ~200 to higher than 600 m(2) g(-1). Methylene blue (MB) was then used to evaluate the adsorption and catalytic activity of the activated RGO (A-RGO) materials with peroxymonosulfate (PMS) as an oxidant. It was found that the SSA and oxygen containing groups are two important factors determining the adsorptive and catalytic performance of the A-RGO materials. RGO by physicochemical CO2/ZnCl2 activation presented the best adsorption and RGO by physical CO2 activation exhibited the highest catalytic degradation of MB.
authors.affiliation: Department of Chemical Engineering, Curtin University, GPO Box, U1987, Perth, WA 6845, Australia. shaobin.wang@curtin.edu.au.
authors.forename: Shizhen
authors.initials: S
authors.lastname: Liu
authors.forename: Wenchao
authors.initials: W
authors.lastname: Peng
authors.forename: Hongqi
authors.initials: H
authors.lastname: Sun
authors.forename: Shaobin
authors.initials: S
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D002245:Carbon Dioxide / Q000737:chemistry; D002384:Catalysis; D002712:Chlorides / Q000737:chemistry; D006108:Graphite / Q000737:chemistry*; D008751:Methylene Blue / Q000737:chemistry; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry; D013499:Surface Properties; D017967:Zinc Compounds / Q000737:chemistry
chemical_list: D002712:Chlorides; D010087:Oxides; D017967:Zinc Compounds; D002245:Carbon Dioxide; D006108:Graphite; C016837:zinc chloride; D008751:Methylene Blue