Zhang Cuiling, Hua Hao, Liu Jianlin, Han Xiangyu, Liu Qipeng, Wei Zidong, Shao Chengbin, Hu Chenguo
1Chongqing Engineering Laboratory for Detection, Control and Integrated System, Chongqing Technology and Business University, Chongqing, 400067 People's Republic of China.
2College of Chemistry and Chemical Engineering, College of Physics, Chongqing University, Chongqing, 400044 People's Republic of China.
Nanomicro Lett. 2017;9(4):49. doi: 10.1007/s40820-017-0150-8. Epub 2017 Jul 19.
Ag-AgX(X = Cl, Br)@TiO nanoparticle-aggregated spheres with different mass ratio of = TiO/Ag(X) from 35:1 to 5:1 were synthesized by a facile sol-gel technique with post-photoreduction. The photocatalytic activities of both Ag-AgCl@TiO and Ag-AgBr@TiO under visible light are effectively improved by ~3 times relative to TiO NPAS under the simulated sunlight for the decomposition of methyl orange (MO). Ag-AgBr@TiO showed 30% improvement and less stable in photocatalytic activity than that of AgCl@TiO. The role of Ag and AgX nanoparticles on the surface of Ag-AgX(X = Cl, Br)@TiO was discussed. Ag on these samples not only can efficiently harvest visible light especially for AgCl, but also efficiently separate excited electrons and holes via the fast electron transfer from AgX(X = Cl, Br) to metal Ag nanoparticles and then to TiO-aggregated spheres on the surface of heterostructure. On the basis of their efficient and stable photocatalytic activities under visible-light irradiation, these photocatalysts could be widely used for degradation of organic pollutants in aqueous solution.
通过简便的溶胶 - 凝胶技术结合光还原法合成了TiO/Ag(X)质量比从35:1到5:1的Ag - AgX(X = Cl, Br)@TiO纳米颗粒聚集球。在模拟太阳光下，相对于TiO纳米颗粒聚集球，Ag - AgCl@TiO和Ag - AgBr@TiO在可见光下对甲基橙（MO）分解的光催化活性均有效提高了约3倍。Ag - AgBr@TiO的光催化活性比AgCl@TiO提高了30%，但稳定性较差。讨论了Ag - AgX(X = Cl, Br)@TiO表面上Ag和AgX纳米颗粒的作用。这些样品上的Ag不仅能有效捕获可见光，尤其是对于AgCl，还能通过从AgX(X = Cl, Br)到金属Ag纳米颗粒再到异质结构表面的TiO聚集球的快速电子转移，有效地分离激发电子和空穴。基于它们在可见光照射下高效且稳定的光催化活性，这些光催化剂可广泛用于水溶液中有机污染物的降解。
