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One-Step Synthesis of b-N-TiO2/C Nanocomposites with High Visible Light Photocatalytic Activity to Degrade Microcystis aeruginosa

文献类型： 外文期刊

作者： Zhang, Xu 1 ; Cai, Min 1 ; Cui, Naxin 1 ; Chen, Guifa 1 ; Zou, Guoyan 1 ; Zhou, Li 1 ;

作者机构： 1.Shanghai Acad Agr Sci, Inst Ecoenvironm & Plant Protect, Shanghai 201403, Peoples R China

2.Shanghai Engn Res Ctr Low Carbon Agr, Shanghai 201403, Peoples R China

关键词： b-N-TiO2/C; doped nitrogen; defects; modified carbon; chlorophyll-a; photocatalytic mechanism

期刊名称：CATALYSTS （ 影响因子：4.146； 五年影响因子：4.399 ）

ISSN：

年卷期： 2020 年 10 卷 5 期

页码：

收录情况： SCI

摘要： Black TiO(2)with doped nitrogen and modified carbon (b-N-TiO2/C) were successfully prepared by sol-gel method in the presence of urea as a source of nitrogen and carbon. The photocatalysts were characterized by field emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman, electron paramagnetic resonance (EPR), and UV-vis diffuse reflectance spectra (DRS). The doped nitrogen, introduced defects, and modified carbon played a synergistic role in enhancing photocatalytic activity of b-N-TiO2/C for the degradation of chlorophyll-a in algae cells. The sample, with a proper amount of phase composition and oxygen vacancies, showed the highest efficiency to degrade chlorophyll-a, and the addition of H(2)O(2)promoted this photocatalysis degradation. Based on the trapping experiments and electron spin resonance (ESR) signals, a photocatalytic mechanism of b-N-TiO2/C was proposed. In the photocatalytic degradation of chlorophyll-a, the major reactive species were identified as OH and O-2(-). This research may provide new insights into the photocatalytic inactivation of algae cells by composite photocatalysts.

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