银和氯化银改性的三相混合二氧化钛粉末在紫外-可见光下具有增强的光催化活性

Three-Phase Mixed Titania Powder Modified by Silver and Silver Chloride with Enhanced Photocatalytic Activity under UV-Visible Light.

作者信息

Zhu Xiaodong, Qin Fengqiu, Xia Yangwen, Yang Daixiong, Feng Wei, Jiao Yu

机构信息

School of Mechanical Engineering, Chengdu University, Chengdu 610106, China.

School of Science, Xichang University, Xichang 615000, China.

出版信息

Nanomaterials (Basel). 2022 May 9;12(9):1599. doi: 10.3390/nano12091599.

DOI:10.3390/nano12091599

PMID:35564308

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9100623/

Abstract

Pure and Ag/AgCl-modified titania powders with anatase/rutile/brookite three-phase mixed structure were prepared by one-step hydrothermal method. The effects of Ag/Ti atomic percentages on the structure and photocatalytic performance of TiO were investigated. The results showed that pure TiO consisted of three phases, anatase, rutile, and brookite, and that Ag addition promoted the transformation from anatase to rutile. When the molar ratio of Ag/Ti reached 4%, the AgCl phase appeared. The addition of Ag had little effect on the optical absorption of TiO; however, it did favor the separation of photogenerated electrons and holes. The results of photocatalytic experiments showed that after Ag addition, the degradation degree of rhodamine B (RhB) was enhanced. When the molar ratio of Ag/Ti was 4%, Ag/AgCl-modified TiO exhibited the highest activity, and the first-order reaction rate constant was 1.67 times higher than that of pure TiO.

摘要

采用一步水热法制备了具有锐钛矿/金红石/板钛矿三相混合结构的纯二氧化钛粉末和Ag/AgCl修饰的二氧化钛粉末。研究了Ag/Ti原子百分比对TiO结构和光催化性能的影响。结果表明，纯TiO由锐钛矿、金红石和板钛矿三相组成，添加Ag促进了锐钛矿向金红石的转变。当Ag/Ti摩尔比达到4%时，出现了AgCl相。Ag的添加对TiO的光吸收影响不大；然而，它确实有利于光生电子和空穴的分离。光催化实验结果表明，添加Ag后，罗丹明B（RhB）的降解程度提高。当Ag/Ti摩尔比为4%时，Ag/AgCl修饰的TiO表现出最高的活性，一级反应速率常数比纯TiO高1.67倍。