中文关键词:二氧化钛熔融盐氧空位缺陷光催化活性 英文关键词:Titanium dioxideMolten saltOxygen vacanciesDefectsPhotocatalytic activity 基金项目:北京市教育委员会科技计划项目（KM20180028009）资助

作者	单位	E-mail
杜梦凡	首都师范大学化学系 北京 100048
陈啟荣	北京市科学技术研究院北京市理化分析测试中心 北京 100089
邹钰	首都师范大学化学系 北京 100048
杨凯萌	首都师范大学化学系 北京 100048
胡舰心	首都师范大学化学系 北京 100048
孟祥福	首都师范大学化学系 北京 100048	xfmeng@cnu.edu.cn

摘要点击次数:790 全文下载次数:0 中文摘要: 氧空位缺陷对半导体材料性能的积极作用引起人们越来越多的关注。本文中，以TiCl₄在三氟乙酸中的水解产物为前驱体，通过一步熔融盐法成功合成了具有富氧空位的蓝色TiO₂纳米片。由于熔融盐低的氧分压，使前驱体在煅烧过程中消耗了TiO₂中的晶格氧从而产生大量的氧空位和Ti³⁺。紫外-可见漫反射光谱测试表明，蓝色TiO₂纳米片的带隙宽度减小至2.69eV，光吸收范围从紫外光区拓宽到可见光区。所制备的蓝色TiO₂纳米片表现出优异的光催化活性，在全光谱照射下，对若丹明B的光降解速率是纯TiO₂的47.3倍。同时，形成的晶格氟掺杂能有效地稳定氧空位，极大地提高了光生载流子的分离效率。本工作为在半导体氧化物材料内构建氧空位提供了新的思路。 英文摘要: The positive effects of oxygen vacancy defects on the performance of semiconductor materials are attracting increasing attention. Herein, blue TiO₂ nanosheet with rich oxygen vacancies was successfully synthesized via a one-step molten salt method using the hydrolysis product of TiCl₄ in trifluoroacetic acid as a precursor. Due to the low oxygen partial pressure of the molten salt, the lattice oxygen of TiO₂ was consumed during calcination, leading to a large amount of oxygen vacancies and Ti³⁺. UV-Visible diffuse reflectance spectroscopy showed that the band gap of blue TiO₂ nanosheets was reduced to 2.69 eV, and the light adsorption range was extended from the ultraviolet region to the visible region. The as-prepared blue TiO₂ nanosheets exhibits excellent photocatalytic activity, and the photodegradation rate of rhodamine B is 47.3 times that of pure TiO₂ under full-spectrum light irradiation. At the same time, the formed lattice fluorine doping can effectively stabilize the oxygen vacancies and greatly improve the separation efficiency of the photogenerated carriers. This work provides a new insight for constructing oxygen vacancies in semiconductor oxide materials. 查看全文查看/发表评论下载PDF阅读器 -->