Abstract: C3 N4-CaTi2 O4 ( OH) 2 composite powders were prepared by the addition of a certain molar ratio of C3 N4 powder using anhydrous calcium chloride-TBOT-anhydrous ethanol system by solvothermal method.The microstructure of the samples were characterized by X-ray diffraction ( XRD ) , specific surface area ( BET ) and scanning electron microscopy ( SEM ) .And the absorption properties of the samples were analyzed by ultraviolet-visible absorption spectrophotometer .Effects of different C 3 N4 composite on phase , microstructure and photocatalytic properties of CaTi 2 O4 ( OH ) 2 samples were studied.The experimental results show that: the introduction of C 3 N4 powder significantly enhance the photocatalytic activity of CaTi 2 O4 ( OH ) 2 samples and the sample has the highest photocatalytic performance(K=0.02338 min-1) in 250 nm when CaTi2O4(OH)2:C3N4 composite molar ratio is 1:0.75.

Key words: C3 N4-CaTi2 O4 ( OH) 2 composite powders were prepared by the addition of a certain molar ratio of C3 N4 powder using anhydrous calcium chloride-TBOT-anhydrous ethanol system by solvothermal method.The microstructure of the samples were characterized by X-ray diffraction ( XRD ) , specific surface area ( BET ) and scanning electron microscopy ( SEM ) .And the absorption properties of the samples were analyzed by ultraviolet-visible absorption spectrophotometer .Effects of different C 3 N4 composite on phase , microstructure and photocatalytic properties of CaTi 2 O4 ( OH ) 2 samples were studied.The experimental results show that: the introduction of C 3 N4 powder significantly enhance the photocatalytic activity of CaTi 2 O4 ( OH ) 2 samples and the sample has the highest photocatalytic performance(K=0.02338 min-1) in 250 nm when CaTi2O4(OH)2:C3N4 composite molar ratio is 1:0.75.