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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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Published in: | Environmental science and pollution research international 2022-06, Vol.29 (27), p.40585 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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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. |
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ISSN: | 1614-7499 |