Selective activation of dioxygen to singlet oxygen over La-Si co-doped TiO2 microspheres for photocatalytic degradation of formaldehyde

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Shuaitao Li , Haodi Liu , Xun Hu , Yanfen Fang , Xiaofeng Cao , Qifeng Chen
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引用次数: 0

Abstract

Volatile Organic Compounds (VOCs) are highly harmful to human beings and other organisms, and thus the elimination of VOCs is extremely urgent. Here, La-Si co-doped TiO2 microsphere photocatalysts, which were prepared by a hydrothermal method, exhibited high photocatalytic activity in the decomposition of formaldehyde compared with TiO2. The improved activity can be attributed to the promoted separation efficiency and density of the charge carriers, as verified by the electrochemical results in combination with density functional theory calculations. In addition, the Si dopant changed the microstructure and surface acidity, while the addition of La promoted the separation efficiency of charge carriers. More interestingly, it was found that singlet oxygen was the key species in the activation of molecular dioxygen, and it played a pivotal role in the photocatalytic decomposition of formaldehyde. This work provides a novel strategy for the selective activation of dioxygen for use in the decomposition of formaldehyde.

Abstract Image

在 La-Si 共掺杂 TiO2 微球上选择性地将二氧活化为单线态氧,用于光催化降解甲醛
挥发性有机化合物(VOCs)对人类和其他生物体的危害极大,因此消除 VOCs 已迫在眉睫。与 TiO2 相比,采用水热法制备的 La-Si 共掺杂 TiO2 微球光催化剂在分解甲醛过程中表现出较高的光催化活性。电化学结果结合密度泛函理论计算证实,活性的提高可归因于电荷载流子的分离效率和密度的提高。此外,Si 掺杂改变了微观结构和表面酸度,而 La 的加入则提高了电荷载流子的分离效率。更有趣的是,研究发现单线态氧是活化分子二氧的关键物种,在光催化分解甲醛的过程中起着举足轻重的作用。这项工作为选择性活化二氧以用于分解甲醛提供了一种新策略。
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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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