ITO/g-C_3N_4异质结催化剂的制备及其光解水产氢性能

Preparation and Photocatalytic Performance of ITO/g-C_3N_4 Heterojunction Photocatalysts for Hydrogen Evolution from Water

采用低温热解法合成出g-C_3N_4和In_2O_3:Sn(ITO)催化剂粉体,通过静电引力作用将少量ITO纳米粉体分散在g-C_3N_4粉体颗粒表面制成ITO/g-C_3N_4异质结光催化剂。在可见光模拟系统中以乙醇为牺牲剂,检测氢气生成速率表征催化剂的光催化性能,并借助X射线衍射(XRD)分析、扫描电镜(SEM)、透射电镜(TEM)、紫外-可见光漫反射吸收光谱(UV-Vis)等对催化剂粉体进行了表征。实验结果表明,ITO附着在g-C_3N_4颗粒表面有利于光生电子的转移和光解水析氢反应。ITO/g-C_3N_4催化剂较之纯g-C_3N_4催化剂活性显著提高。当ITO附着量为4%时,析氢速率可稳定在350μmol·g^(-1)·h^(-1)。

g-C_3N_4 and In_2O_3：Sn（ITO） photocatalysts were synthesized by low-temperature calcined method. A little nanosized ITO as an effective cocatalyst was loaded onto g-C_3N_4 particle surface by electrostatic attraction. The photocatalytic activity of ITO/g-C_3N_4 was performed by its H2 evolution performance under uv-vis irradiation while alcohol was used as a sacrificial agent, and the photocatalyst was characterized by XRD, SEM, TEM and UV-Vis absorption spectrum. The results showed that the photocatalytic activity of ITO/g-C_3N_4 was superior to that of pure g-C_3N_4, and loaded ITO can improve the interfacial electron transfer and the H_2 evolution. When the amount of loaded ITO was 4%（wt）, the stable average hydrogen evolution rate was about 350 μmol·g^（-1）·h^（-1）.