钛酸盐负载Ag型光催化剂降解罗丹明B  

Photocatalytic degradation of rhodamine B by titanate loaded Ag

作　　者：郭栗村 烟征 可欣 GUO Licun;YAN Zheng;KE Xin(College of Energy and Environment,Shenyang Aerospace University,Shenyang 110136,China)

机构地区：[1]沈阳航空航天大学能源与环境学院,沈阳110136

出　　处：《生态学杂志》2023年第7期1749-1754,共6页Chinese Journal of Ecology

基　　金：辽宁省“兴辽英才计划”(XLYC1807045);沈阳市中青年科技创新人才支持计划(RC180101)资助。

摘　　要：针对钛酸盐纳米管光催化剂(TNTs)的催化活性低的缺点,本研究采用原位光还原-沉积法制备了TNTs负载活性组分Ag的光催化剂,旨在借助贵金属的等离子体共振效应,增加光响应能力的同时降低电子-空穴的复合速率。10%Ag/TNTs在120 min内对罗丹明B完全去除,并且拟合一级动力学的降解速率k为0.04227 min^(-1),是无负载TNTs (0.01865 min^(-1))的2.3倍。UV-Vis表征测得10%Ag/TNTs的能带隙宽度(3.1 eV)也较无负载TNTs(3.44 eV)窄。TEM和XPS等表征显示,Ag纳米颗粒被成功负载在TNTs上,构建的异质结有利于光生电子与空穴的分离与迁移,增强表面电子捕获能力,提高光催化活性。In view of the low catalytic activity of titanate nanotubes photocatalyst(TNTs),photocatalyst of TNTs loaded with active component Ag was prepared by in-situ photoreduction-deposition method,aiming to enhance the photoresponse ability and reduce the electron-hole recombination rate by taking advantage of the plasma resonance effect of precious metals.Rhodamine B was completely removed by 10%Ag/TNTs within 120 min.The degradation rate k fitted to the first-order kinetics was 0.04227 min^(-1),which was 2.3 times that of unloaded TNTs(0.01865 min^(-1)).UV-Vis calculations measured that the energy band gap width(3.1 eV)of 10%Ag/TNTs was also much narrower than unloaded TNTs(3.44 eV).Characterizations of TEM and XPS showed that Ag nanoparticles were successfully loaded on TNTs.The heterojunction facilitated the separation and migration of photogenerated electrons and holes,enhanced the surface electron capture ability,and improved photocatalytic activity.

关 键 词：光催化 罗丹明B 异质结 降解机制 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] X703[环境科学与工程—环境工程]