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

by Xu Zhang 1,2, Min Cai 1,2, Naxin Cui 1,2, Guifa Chen 1,2, Guoyan Zou 1,2 and Li Zhou 1,2,*
1
Institute of Eco-Environmental and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
2
Shanghai Engineering Research Center of Low-Carbon Agriculture, Shanghai 201403, China
*
Author to whom correspondence should be addressed.
Catalysts 2020, 10(5), 579; https://doi.org/10.3390/catal10050579
Received: 15 April 2020 / Revised: 7 May 2020 / Accepted: 19 May 2020 / Published: 21 May 2020
(This article belongs to the Special Issue Progression in Photocatalytic Materials for Efficient Performance)
Black TiO2 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 H2O2 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 O2. This research may provide new insights into the photocatalytic inactivation of algae cells by composite photocatalysts. View Full-Text
Keywords: b-N-TiO2/C; doped nitrogen; defects; modified carbon; chlorophyll-a; photocatalytic mechanism b-N-TiO2/C; doped nitrogen; defects; modified carbon; chlorophyll-a; photocatalytic mechanism
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MDPI and ACS Style

Zhang, X.; Cai, M.; Cui, N.; Chen, G.; Zou, G.; Zhou, L. One-Step Synthesis of b-N-TiO2/C Nanocomposites with High Visible Light Photocatalytic Activity to Degrade Microcystis aeruginosa. Catalysts 2020, 10, 579.

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