反应时间对氮掺杂板钛矿TiO₂的合成及光催化降解盐酸四环素的影响  

Reaction Time Impact on Photocatalytic Antibiotics Degradation of N-Doped Brookite TiO2 Nanoparticles-Assembly

作　　者：姜敏俊 胡景茹 程刚 

机构地区：[1]武汉工程大学化学与环境工程学院,湖北 武汉

出　　处：《材料科学》2024年第5期602-613,共12页Material Sciences

摘　　要：光驱动抗生素降解是一种绿色、有效、应用广泛的技术。本工作在钛前驱体的基础上,通过两步溶剂热法并改变后处理的反应时间成功制备了三种氮掺杂板钛矿TiO2。详细研究了板钛矿纳米晶体的结构,研究了不同合成方法对其光学性质和光催化降解活性的影响。采用XRD、SEM、XPS、DRS等手段对通过改变反应时间制备的N-B-TiO2-3 h、N-B-TiO2-6 h、N-B-TiO2-12 h样品进行了表征。研究表明,溶剂热处理时间的改变基本不会改变氮掺杂板钛矿TiO2的形貌,但是其光学吸收性质和能带结构发生明显变化。光催化降解盐酸四环素实验结果表明N-B-TiO2-6 h具有相对较高的光催化活性,主要归因于其具有最小的禁带宽度、最快的电荷分离效率以及最长的光生电子寿命。通过HRMS推测了盐酸四环素可能存在的光催化降解途径和机理。Light-driven antibiotic degradation is a green, effective and widely used technology. On the basis of titanium precursor, three types of nitrogen-doped brookite TiO2 were successfully prepared by a two-step solvothermal method and changing the reaction time of post-treatment. The structures of brookite nanocrystals were studied in detail, and the effects of different synthesis methods on their optical properties and photocatalytic degradation activities were studied. The N-B-TiO2-3 h, N-B-TiO2-6 h and N-B-TiO2-12 h samples prepared by changing the reaction time are characterized by XRD, SEM, XPS and DRS. The results show that the change of solvent heat treatment time does not change the morphology of nitrogen-doped brookite TiO2, but its optical absorption properties and energy band structure change significantly. The experimental results of photocatalytic degradation of tetracycline hydrochloride show that N-B-TiO2-6 h has relatively high photocatalytic activity, mainly due to its smallest band gap, fastest charge separation efficiency and longest photogenerated electron lifetime. The possible photocatalytic degradation pathway and mechanism of tetracycline hydrochloride are deduced by HRMS.

关 键 词：板钛矿TiO₂ 四环素 电荷分离 降解路径 

分 类 号：O64[理学—物理化学]