采用液相剥离和溶剂热法制备TiO2/WS2/g-C3N4复合光催化剂.通过液相剥离的方法在乙醇体系中将块状WS2和C3N4剥离得到相应的纳米片;利用热处理法使TiO2纳米粒子原位生长并固定于WS2/g-C3N4纳米片上.采用光催化降解甲基橙(MO)来评价TiO2/WS2/g-C3N4的光催化活性.结果表明,TiO2/WS2/g-C3N4复合光催化剂的光催化活性远高于纯态TiO2,g-C3N4及TiO2/g-C3N4复合物,这主要归因于WS2/g-C3N4杂化复合物与TiO2纳米粒子之间的协同作用,有效促进了复合光催化剂中光生电子/空穴对的分离,提高了光子的利用率.活性自由基的捕获实验表明,?O2?对MO的降解起着决定性的作用,这说明?O2?是光催化反应过程中主要的活性自由基.
TiO2/WS2/g-C3N4 composite photocatalysts were synthesized by a liquid-exfoliation-solvothermal method. In this process, the WS2/g-C3N4 nano-sheets were prepared by liquid-exfoliation method from the bulk WS2 and C3N4 in the alcohol system, and then the TiO2 nanoparticles (NPs) grew on the WS2/g-C3N4 nano-sheets by in-situ synthesized technique. The photocatalytic activity of the as-prepared samples was evaluated by photocatalytic degradation of methyl orange (MO). The results showed that the as-prepared samples exhibited higher photocatalytic activities as compared to the pure TiO2, g-C3N4 and TiO2/g-C3N4 composite. The enhanced photocatalytic activities of TiO2/WS2/g-C3N4 photocatalysts could be attributed to the synergistic effect of heterostructure between TiO2 NPs and WS2/g-C3N4 nano-sheets, which could efficiently improve the separation of photogenerated electron/hole pairs and utilization efficiency of photons. The quenching tests of radicals indicated that?O2? had crucial effect on degradation of MO, which demonstrated that?O2? was the main active radical in photocatalytic reaction process.
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