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Enhancement and stabilization of isolated hydroxyl groups via the construction of coordinatively unsaturated sites on surface and subsurface of hydrogenated TiO2 nanotube arrays for photocatalytic complete mineralization of toluene
Journal of Environmental Chemical Engineering ( IF 7.7 ) Pub Date : 2021-01-14 , DOI: 10.1016/j.jece.2021.105080
Qin Cheng , Azhu Wang , Zhimin Song , Jun Bao , Jiawei Xue , Yuxue Wei , Shikuo Li , Lingling Lv , Jianjun Ding , Mengdie Cai , Jingshuai Chen , Qi Wang , Chen Gao , Song Sun

Hydroxyl groups on the photocatalyst surface provide adsorption sites and starting species to form hydroxyl radicals, and are thus considered as the most important species for the photocatalytic degradation of toluene. However, the complete mineralization of toluene over TiO2 photocatalysts is still challenging because of insufficient and unstable hydroxyl groups. Here, a hydrogenated TiO2 nanotube array mesh (H-TiO2) was fabricated. H-TiO2 capable of trapping light and serving high surface areas for active sites exhibited a toluene mineralization conversion of 100%. It was found that surface distortion and oxygen vacancies ensured the chemical dissociative adsorption of water to generate sufficient isolated hydroxyls on the surface and subsurface and benefited the regeneration in long-term operations. This study may provide an efficient TiO2-based photocatalyst for the removal of volatile organic compounds for air purification and give comprehensive understandings of the photocatalyst surface modification and theoretical guidance for designing hydroxyl-demanding photocatalysts.



中文翻译:

通过在氢化的TiO 2纳米管阵列的表面和次表面上构建配位不饱和位点来增强和稳定孤立的羟基,以完成甲苯的光催化完全矿化

光催化剂表面上的羟基提供了吸附位点和形成羟基自由基的起始物质,因此被认为是甲苯光催化降解的最重要物质。然而,由于羟基的不足和不稳定,在TiO 2光催化剂上甲苯的完全矿化仍然具有挑战性。在此,制造了氢化的TiO 2纳米管阵列网孔(H-TiO 2)。钛白粉2能够捕获光并为活性位点提供高表面积的技术显示出100%的甲苯矿化转化率。发现表面畸变和氧空位确保水的化学解离吸附,从而在表面和次表面上产生足够的孤立羟基,并有利于长期操作中的再生。这项研究可以为去除空气中的挥发性有机化合物提供一种有效的基于TiO 2的光催化剂,并提供对光催化剂表面改性的全面理解,并为设计要求羟基的光催化剂提供理论指导。

更新日期:2021-01-22
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