可控制备Zn_xCd_(1-x)S/TiO_2复合纳米网及光催化性能

Controllable Synthesis of Zn_xCd_(1-x)S/TiO_2 Composited Nanomesh and Its Photocatalytic Property

以Ti O_2纳米网为基底,采用循环伏安法将Zn_xCd_(1-x)S纳米粒子可控沉积在Ti O_2纳米网上,得到了Zn_xCd_(1-x)S/Ti O_2纳米网复合材料。在沉积过程中,探讨了沉积温度对Zn_xCd_(1-x)S粒子形成的影响,实验发现当沉积温度在75~80℃时,Zn_xCd_(1-x)S纳米粒子可以均匀的沉积在Ti O_2纳米网表面,并且没有堵塞Ti O_2纳米管的管口。以2,4-二氯苯氧乙酸(2,4-D)为目标污染物,对催化剂的催化性能进行评估,并探讨pH值对催化效率的影响。结果表明:在模拟太阳光的照射下,Zn_xCd_(1-x)S/Ti O_2纳米网对2,4-D的降解率达到了99.4%,是相同条件下未修饰的Ti O_2纳米网的1.66倍。此外,当pH为3时,光催化降解效率最高,并表现出优异的稳定性能。

ZnxCd（1-x）S nanoparticles were controllable deposited on TiO2 nanomesh by cyclic voltammetry,obtaining the ZnxCd（1-x）S/TiO2 nanocomposites. During the deposition process,the effect of deposition temperature on the formation of ZnxCd（1-x）S particles was discussed. It was found that when the deposition temperature was 75-80 ℃,the ZnxCd（1-x）S nanoparticles can be uniformly deposited on the surface of TiO2 nanomesh without blocking the surface of TiO2 nanotubes. The photocatalytic performances of the samples were evaluated by using 2,4-Dichlorophenoxyacetic acid（2,4-D） as the target pollutant,and the effect of pH on the catalytic efficiency was also investigated. The results show that the degradation efficiency rate of 2,4-D on the ZnxCd（1-x）S/TiO2 nanomesh reached to 99. 4% under the irradiation of simulated sunlight,which was 1. 66 times than that of unmodified TiO2 nanomesh. In addition,the highest photocatalytic degradation efficiency was obtained when the pH was 3,and the stability of the Znx Cd1-xS/TiO2 nanomesh was good.