TiO_2/石墨烯在模拟太阳光下光催化降解碱性品红的研究

A Study of Photocatalytic Degradation of Fuchsin Basic Using TIO_2/Graphene under Simulated Sunlight Irradiation

采用溶胶-凝胶法制备了TiO_2/石墨烯复合光催化剂并对其进行XRD表征,在模拟太阳光下对碱性品红溶液进行光催化降解实验.考察了不同催化剂、催化剂浓度、碱性品红溶液初始浓度、反应体系初始酸度以及催化剂循环使用次数对光催化降解效果的影响.实验结果表明:所制的复合光催化剂对碱性品红的降解效果高于其两种成分单独存在的情况;当碱性品红溶液的浓度为10 mg/L,催化剂浓度为1 g/L,反应体系的pH值为9时,经过100 min的光照,碱性品红的降解率可达98.5%;催化剂在循环使用6次后仍可对碱性品红保持较高的降解活性.

Composite catalysts of titanium dioxide/graphene (TiO2/GR) were synthesized by a modified sol-gel method and the characterization was tested by XRD. The photocatalytic degradation of fuchsin basic under simulated sunlight was carried out using the synthesized composite catalysts. The effects of catalytic efficiency,dosages of catalysts, initial concentrations of reactant, initial pH of the reaction medium and useful lifecycleof the catalyst on degradation of fuchsin basic were investigated. The results showed that the degradationefficiency of fuchsin basic was higher with the composite catalyst in comparison with either titanium dioxide orgraphene alone. When the initial concentrations of fuchsin basic, dosage of catalyst were 10 mg/L and 1g/L, respectively, and at a pH of 9 and irradiation time of 100 min, the removal efficiency of fuchsin basic could reached 98.5%. After six recycles of usage, the composite photocatalyst was still effective for photolysis of fuchsin basic.