Indoor VOCs pollution has attracted broad attention for its harm to mankind’s health recent years. Photocatalytic degradation of indoor VOCs holds great prospects in addressing these health concerns in daily life. However, traditional photocatalysts have a large recombination rate of charge carriers and a decrease of the photocatalytic degradation efficiency under high relative humidity. Herein, uniform tungsten oxide nanoparticles with enriched oxygen vacancies (WO-U) were synthesized by a direct annealing method with urea addition, which exhibited superior performance in the visible-light photocatalysis. The reaction rate constant value of photocatalytic acetaldehyde degradation over WO-U catalyst was above 3 times higher than that of pristine WO sample. More importantly, the WO-U catalyst maintained stable and excellent photocatalytic performance at relative humidity range of 25–100 %. Except for the enhanced photogenerated charges separation, abundant oxygen vacancies could effectively accelerate O activation to generate •O, which accounted mainly for the initial conversion of acetaldehyde. Then the subsequent transformation of •O into •OH to promoted the final mineralization of acetaldehyde. In addition, the presence of oxygen vacancies also facilitated HO dissociation to form surface hydroxyl groups, which increased the adsorption of acetaldehyde, resulting in the consistent photocatalytic performance of WO-U catalyst within a wide humidity range. This work provides guidelines to design visible-light responsive photocatalysts with efficient activity at high humidity conditions for indoor VOCs degradation.

中文翻译：

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缺氧 WO3 可在宽湿度范围内稳定可见光催化降解乙醛


近年来，室内VOCs污染因其对人类健康的危害而受到广泛关注。光催化降解室内挥发性有机化合物在解决日常生活中的这些健康问题方面具有广阔的前景。然而，传统光催化剂在高相对湿度下载流子复合率较大，光催化降解效率下降。在此，通过添加尿素的直接退火方法合成了具有富氧空位的均匀氧化钨纳米粒子（WO-U），其在可见光光催化中表现出优异的性能。 WO-U催化剂光催化降解乙醛的反应速率常数值比原始WO样品高3倍以上。更重要的是，WO-U催化剂在25-100%的相对湿度范围内保持稳定和优异的光催化性能。除了增强光生电荷分离外，丰富的氧空位还可以有效加速O活化生成·O，这主要是乙醛的初始转化。随后•O转化为•OH，促进乙醛最终矿化。此外，氧空位的存在也促进了H2O解离形成表面羟基，从而增加了乙醛的吸附，导致WO-U催化剂在较宽的湿度范围内具有一致的光催化性能。这项工作为设计可见光响应光催化剂提供了指导，该催化剂在高湿度条件下具有高效活性，可降解室内 VOC。