Zhu Xiaodong, Xu Hongyan, Yao Yin, Liu Hui, Wang Juan, Pu Yun, Feng Wei, Chen Shanhua
College of Mechanical Engineering, Chengdu University Chengdu 610106 China
College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology Chengdu 610059 China
RSC Adv. 2019 Dec 4;9(68):40003-40012. doi: 10.1039/c9ra08655b. eCollection 2019 Dec 2.
Pure TiO, Ag-modified TiO, Fe-doped TiO, and Ag-modified/Fe-doped TiO photocatalysts were synthesized sol-gel technology. The crystal structure, element composition and surface morphology of the obtained photocatalysts were characterized XRD, XPS, SEM and TEM, respectively. The results indicate that Ag-TiO samples show higher photocatalytic activity than pure TiO. Unexpectedly, the photocatalytic activities of Fe-TiO and 1% Ag/1% Fe-TiO are lower than pure TiO. To analyze the main factors affecting photocatalytic performance, the samples were further investigated by PL, DRS and BET. The results prove that the additions of Ag and Fe are advantageous for inhibiting the recombination of photoinduced pairs and improving the utilization of light. Fe-TiO and 1% Ag/1% Fe-TiO exhibit smaller specific surface areas than pure TiO, which is the primary reason for their reduced photocatalytic performances.
采用溶胶 - 凝胶技术合成了纯TiO₂、Ag修饰的TiO₂、Fe掺杂的TiO₂以及Ag修饰/Fe掺杂的TiO₂光催化剂。分别通过XRD、XPS、SEM和TEM对所得光催化剂的晶体结构、元素组成和表面形貌进行了表征。结果表明，Ag - TiO₂样品显示出比纯TiO₂更高的光催化活性。出乎意料的是，Fe - TiO₂和1% Ag/1% Fe - TiO₂的光催化活性低于纯TiO₂。为了分析影响光催化性能的主要因素，通过PL、DRS和BET对样品进行了进一步研究。结果证明，Ag和Fe的添加有利于抑制光生载流子对的复合并提高光的利用率。Fe - TiO₂和1% Ag/1% Fe - TiO₂的比表面积比纯TiO₂小，这是它们光催化性能降低的主要原因。
