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Characterization of TiO 2 and an as-prepared TiO 2 /SiO 2 composite and their photocatalytic performance for the reduction of low-concentration N-NO 3 - in water

Excessive N-NO water pollution has become a widespread and serious problem that threatens human and ecosystem health. Here, a TiO /SiO composite photocatalyst was prepared via the sol-gel/hydrothermal method. TiO and TiO /SiO were characterized by X-ray diffraction (XRD), UV-Vis differential reflect...

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Bibliographic Details
Published in:Environmental science and pollution research international 2022-06, Vol.29 (27), p.40585
Main Authors: Zhong, Wanzhen, Fu, Weizhang, Sun, Shujuan, Wang, Lingsheng, Liu, Huaihao, Wang, Junzhi
Format: Article
Language:English
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Summary:Excessive N-NO water pollution has become a widespread and serious problem that threatens human and ecosystem health. Here, a TiO /SiO composite photocatalyst was prepared via the sol-gel/hydrothermal method. TiO and TiO /SiO were characterized by X-ray diffraction (XRD), UV-Vis differential reflectance spectroscopy (DRS), Fourier infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS). Afterward, the photocatalytic performance of TiO and TiO /SiO to reduce low nitrate concentrations (30 mgN L ) under UV light was evaluated and the effects of different factors on this process were investigated, after which the reaction conditions were optimized. Removal rates of up to 99.93% were achieved at a hole scavenger (formic acid) concentration of 0.6 mL L , a CO flow rate of 0.1 m  h , and a TiO concentration of 0.9 g L . In contrast, TiO /SiO at a 1.4 g L concentration and a TiO load rate of 40% achieved a removal rate of 83.48%, but with more than 98% of nitrogen generation rate. NO and NH were the minor products, whereas N was the main product.
ISSN:1614-7499