rGO@MIL-125(Ti)复合型光催化剂降解水相有机污染物

Degradation of aqueous organic pollutants by rGO@MIL-125(Ti)composite photocatalyst

采用简便的溶剂热一步法共价键合亲水性氧化石墨烯(GO)和钛基金属有机框架MIL-125(Ti)制备rGO@MIL-125(Ti)复合型光催化剂。利用SEM、XRD、FTIR、TGA和氮气吸附脱附表征了rGO@MIL-125(Ti)的微观结构,并以甲基橙为探针,研究材料的光催化性能。结果表明,rGMT-X-Y系列光催化剂具有石墨烯基无定型TiO_(2)异质结构和高的表面反应活性位,rGMT-2-1复合材料降解甲基橙的光催化降解效率达到81%,一级反应动力学速率常数k值达0.029 min^(-1),·O_(2)^(-)是光催化反应的主要活性物质。

A simple solvothermal one-step method was used to covalently connect hydrophilic graphene oxide(GO)and titanium-based organic framework MIL-125(Ti)to obtain a rGO@MIL-125(Ti)composite photocatalyst.The microstructure of rGO@MIL-125(Ti)was characterized by SEM,XRD,FTIR,TGA and nitrogen adsorption and desorption.The photocatalytic properties of the material were studied by using methyl orange as a probe.The results show that the rGMT-X-Y series photocatalysts have graphene-based amorphous TiO_(2)heterojunction structure and high surface reactive potential,and the photocatalytic degradation efficiency of rGMT-2-1 composites degrading methyl orange reaches 81%.The first-order reaction kinetic rate constant k value are calculated to be 0.029 min^(-1).·O_(2)^(-)is the main active substance of photocatalytic reactions.