期刊
CHEMOSPHERE
卷 278, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.130298
关键词
Nitrate nitrogen; TiO2; Sandwich-type polyoxometalate; Photocatalysis
资金
- National Natural Science Foundation, China [U1906219]
- Shandong Province major scientific and technological innovation project [2019JZZY010723]
- Natural Science Foundation of Shandong Province [ZR2020MB087]
A sandwich-type polyoxometalate Na [alpha-SiW9O34] was synthesized and SiW9/TiO2/Cu composite was prepared for the catalytic reduction of nitrate. The prepared composite catalyst showed better photocatalytic activity than TiO2, achieving 76.53% nitrate removal with 82.09% N-2 selectivity under specified conditions.
Nitrate nitrogen is one of the vital issues needed to be addressed in the water purification process utilizing groundwater as a drinking water source. In this study, a sandwich-type polyoxometalate Na [alpha-SiW9O34] has been synthesized and SiW9/TiO2/Cu composite has been prepared by sol-gel method. Samples have been characterized by XRD, BET, FTIR, SEM, ED-Mapping, UVeVis, XPS. The catalytic reduction of nitrate was performed in the presence of SiW9/TiO2/Cu composite as photocatalyst. The effects of catalyst loading, initial nitrate concentration, sandwich-type polyoxometalate loading, dissolved O-2, and concentration of formic acid on nitrate removal have been investigated. The results showed that the prepared composite catalyst had better photocatalytic activity than the TiO2. 76.53% of nitrate removal with 82.09% of N-2 selectivity was obtained under the following conditions: catalyst dosage 0.8 g/L, initial nitrate concentration of 30 mg/L, SiW9/Cu loading percentage of 10%, 30 mmol/L of formic acid, in presence of N-2, and 6 h reaction time. (C) 2021 Elsevier Ltd. All rights reserved.
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