Surface catalytic effect of Ag nanoparticles and influence of dissolved oxygen on photocatalytic reduction of nitrate

Bin Huang; Wei Liu; Kun Chao; Dongran Wang; Pengxiang Wang; Tengfeng Xie; Fangming Han; Yan Mi; Haibin Tang; Guowen Meng

doi:10.1039/D5RA00782H

Surface catalytic effect of Ag nanoparticles and influence of dissolved oxygen on photocatalytic reduction of nitrate†

Bin Huang,^ab Wei Liu,^bc Kun Chao,^bd Dongran Wang,^be Pengxiang Wang,^be Tengfeng Xie,

^f Fangming Han,

*^be Yan Mi,*^a Haibin Tang

*^be and Guowen Meng

^be

Author affiliations

* Corresponding authors

^a Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Guangxi Minzu University, Nanning, P. R. China
E-mail: miyan@gxmzu.edu.cn

^b Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, 350 Shushanhu Road, Hefei, Anhui 230031, P. R. China
E-mail: hbtang@issp.ac.cn, fmhan@issp.ac.cn

^c Institutes of Physical Science and Information Technology, School of Materials Science and Engineering, Anhui University, Hefei 230601, P. R. China

^d School of Advanced Materials and Nanotechnology, Xidian University, Xi'an, P. R. China

^e University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, P. R. China

^f Institute of Physical Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China

Abstract

Photocatalytic reduction of nitrate is a promising green strategy to remove nitrogen pollutants from water bodies. However, it is a considerable challenge to directly reduce nitrate using photogenerated electrons. In this work, a g-C₃N₄/Ag-nanoparticle composite demonstrating high catalytic activity toward nitrate is constructed using an in situ photodeposition method. Based on photoelectrochemical, ion chromatography and nuclear magnetic resonance characterization, Ag nanoparticles were found to exhibit strong surface catalytic activity for reducing NO₃⁻ to NO₂⁻, while g-C₃N₄/Au-nanoparticles exhibited no photocatalytic reduction activity toward NO₃⁻. Additionally, the effects of dissolved oxygen on the photocatalysis system of nitrate reduction are analyzed for the first time.

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Surface catalytic effect of Ag nanoparticles and influence of dissolved oxygen on photocatalytic reduction of nitrate†

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Surface catalytic effect of Ag nanoparticles and influence of dissolved oxygen on photocatalytic reduction of nitrate

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