▎ 摘　　要

Nano graphene oxide (NGO) was produced by further refluxing graphene oxide (GO) sheets in HNO3, and carboxylic acid functionalized graphene oxide (GO-COOH) was obtained by a simple etherification reaction between GO and chloroacetic acid. The GO, GO-COOH and NGO sheets are combined with TiO2 nanorods by a two-phase assembling method, and confirmed by transmission electronic microscopy. The GO-TiO2, GO-COOH-TiO2 and NGO-TiO2 composites are used in a comparative study of photocatalytic H-2 generation activity under UV light irradiation. The H-2 generation rate of TiO2 nanorods was slightly increased from 15 to 30 mL h(-1) g(-1) by replacing oleic acid ligands with hydrophilic dopamine, and significantly increased to 105 mL h(-1) g(-1), after combining with GO sheets. The further comparative study shows that GO-COOH-TiO2 composite has higher H-2 generation rate of 180 mL h(-1) g(-1) than that of GO-TiO2 and NGO-TiO2 composites. (C) 2013 Elsevier Ltd. All rights reserved.