Hydrogenated Amorphous Titania with Engineered Surface Oxygen Vacancy for Efficient Formaldehyde and Dye Removals under Visible-Light Irradiation

无定形固体 材料科学 光催化 带隙 光降解 可见光谱 吸附 光化学 氧气 甲醛 辐照 化学工程 纳米技术 光电子学 化学 催化作用 有机化学 核物理学 工程类 物理
作者
Guang Feng,Mengyun Hu,Botao Wu,Shencheng Shi,Shuai Yuan,Yanan Li,Heping Zeng
出处
期刊:Nanomaterials [Multidisciplinary Digital Publishing Institute]
卷期号:12 (5): 742-742 被引量:4
标识
DOI:10.3390/nano12050742
摘要

Hydrogenated crystalized TiO2-x with oxygen vacant (OV) doping has attracted considerable attraction, owing to its impressive photoactivity. However, amorphous TiO2, as a common allotrope of titania, is ignored as a hydrogenated templet. In this work, hydrogenated amorphous TiO2-x (HAm-TiO2-x) with engineered surface OV and high surface area (176.7 cm2 g-1) was first prepared using a unique liquid plasma hydrogenation strategy. In HAm-TiO2-x, we found that OV was energetically retained in the subsurface region; in particular, the subsurface OV-induced energy level preferred to remain under the conduction band (0.5 eV) to form a conduction band tail and deep trap states, resulting in a narrow bandgap (2.36 eV). With the benefits of abundant light absorption and efficient photocarrier transportation, HAm-TiO2-x coated glass has demonstrated superior visible-light-driven self-cleaning performances. To investigate its formaldehyde photodegradation under harsh indoor conditions, HAm-TiO2-x was used to decompose low-concentration formaldehyde (~0.6 ppm) with weak-visible light (λ = 600 nm, power density = 0.136 mW/cm2). Thus, HAm-TiO2-x achieved high quantum efficiency of 3 × 10-6 molecules/photon and photoactivity of 92.6%. The adsorption capabilities of O2 (-1.42 eV) and HCHO (-1.58 eV) in HAm-TiO2-x are both largely promoted in the presence of subsurface OV. The surface reaction pathway and formaldehyde decomposition mechanism over HAm-TiO2-x were finally clarified. This work opened a promising way to fabricate hydrogenated amorphous photocatalysts, which could contribute to visible-light-driven photocatalytic environmental applications.
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