title: Preparation of water-dispersible porous g-C3N4 with improved photocatalytic activity by chemical oxidation.
abstract: Hydrophilic treatment of bulk graphene-like carbon nitride (g-C3N4) for future applications has aroused extensive interest, due to its enhanced specific surface area and unusual electronic properties. Herein, water-dispersible g-C3N4 with a porous structure can be obtained by chemical oxidation of bulk g-C3N4 with K2Cr2O7-H2SO4. Acid oxidation results in the production of hydroxyl and carboxyl groups on its basal plane and the formation of a porous structure of g-C3N4 at the same time. The porous g-C3N4 appears as networks with tens of micrometers in width and possesses a high specific surface area of 235.2 m(2) g(-1). The final concentration of porous g-C3N4 can be up to 3 mg mL(-1). Compared with bulk g-C3N4, the as-obtained porous g-C3N4 exhibits excellent water dispersion stability and shows great superiority in photoinduced charge carrier separation and transfer. The photocatalytic activities of porous g-C3N4 towards degradation of organic pollutants are much higher than those of the bulk due to the larger band gap (by 0.2 eV) and specific surface areas.
authors.affiliation: Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, P. R. China. chenmeng@fudan.edu.cn.
authors.forename: Hui-Jun
authors.initials: HJ
authors.lastname: Li
authors.forename: Bo-Wen
authors.initials: BW
authors.lastname: Sun
authors.forename: Li
authors.initials: L
authors.lastname: Sui
authors.forename: Dong-Jin
authors.initials: DJ
authors.lastname: Qian
authors.forename: Meng
authors.initials: M
authors.lastname: Chen
mesh_terms: D002384:Catalysis; D006108:Graphite / Q000737:chemistry; D008027:Light; D009570:Nitriles / Q000138:chemical synthesis / Q000737:chemistry*; D010782:Photolysis / Q000528:radiation effects; D016062:Porosity; D011192:Potassium Dichromate / Q000737:chemistry; D012235:Rhodamines / Q000737:chemistry; D013464:Sulfuric Acids / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D009570:Nitriles; D012235:Rhodamines; D013464:Sulfuric Acids; D014874:Water Pollutants, Chemical; C011206:cyanogen; D006108:Graphite; C029773:rhodamine B; C033158:sulfuric acid; D011192:Potassium Dichromate