锐钛矿
光降解
金红石
光化学
化学
硝酸盐
光催化
密度泛函理论
傅里叶变换红外光谱
吸附
亚硝酸盐
选择性
无机化学
催化作用
化学工程
物理化学
有机化学
计算化学
工程类
作者
Jiangzhou Qin,Nengsheng Liu,Yi Wei,Yanyu Lü,Yiping Huang,Qian Zhao,Zhengfang Ye
出处
期刊:Chemosphere
[Elsevier]
日期:2022-11-01
卷期号:307: 135921-135921
被引量:5
标识
DOI:10.1016/j.chemosphere.2022.135921
摘要
Revealing the activation mechanism of nitrate (NO3-) reduction is crucially important to design high-efficiency photocatalysts for NO3- removal. In this work, the performance of photoreduction NO3- has been thoroughly studied over different crystalline phases TiO2. Photodegradation rate of NO3- over anatase TiO2 is found to be higher than that of rutile TiO2 at simulated sunlight, which can achieve high NO3- conversion of 94% and 100% nitrogen selectivity (original concentration of 50 mg/L NO3--N) at reaction time of 4 h. With the aid of in situ Fourier Transform Infrared (FTIR) and density functional theory (DFT) calculations, the possible reaction paths of photoreduction NO3- over anatase TiO2 was verified from theory and practice sides. NO3- was adsorbed on surface Ti site to form bridging nitrate (M - O)2NO model. Then, monodentate nitrite (M-O-N-O) model was the dominant intermediate in the reduction process of NO3-. This study presents a new opinion of photoreduction NO3- reaction paths.
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