Photolysis Mechanism of p-Nitrophenol by Nitrocellulose Membrane in Aqueous Solution

被引：0

作者：

Dai Z.-F. ^{[1
]}

Zhao T.-Q. ^{[1
]}

Yin Y.-G. ^{[2
]}

She J.-P. ^{[1
]}

Wu L. ^{[1
]}

Tai C. ^{[1
]}

Sun J.-Y. ^{[1
]}

Luo Y.-J. ^{[1
]}

机构：

[1] Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo

[2] State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing

来源：

Huanjing Kexue/Environmental Science | 2019年 / 40卷 / 02期

关键词：

Nitrocellulose membrane; P-nitrophenol (PNP); Photolysis; Photolytic products; Water-dissolved substances;

D O I：

10.13227/j.hjkx.201807031

中图分类号：

学科分类号：

摘要：

To investigate the potential application of nitrocellulose membrane (NCM) in water treatment, this study examined the photolysis of p-nitrophenol, with NCM as the source of reactive oxygen species. Effects of solution pH, light conditions, and water dissolved substances on p-nitrophenol photolysis were investigated, and possible mechanisms were discussed. The results demonstrated that the quantum yield for hydroxyl radicals from the NCM was 1.30×10 -4 , which is approximately 1.86 times higher than that from TiO 2 . The photolysis rate of p-nitrophenol in the presence of NCM was 0.0055 min -1 , which is much higher than that in pure water (9.52×10 -4 min -1 ). This promotion was mainly caused by photo-induced generation of •OH on NCM surface under light, in which UVA plays an important role in photolysis. The photolysis rate of p-nitrophenol increased with the increase of light intensity and membrane area. Acidic solution (pH=2.0) was preferred for the degradation of p-nitrophenol, with a photolysis rate of 0.016 5 min -1 ; the corresponding degradation of p-nitrophenol exceeded 90% in 120 min. The effects of dissolved substances on photolysis were significantly different. NO 3 - promoted photolysis by generation of •OH, and dissolved organic matter decreased photolysis through light attenuation. The intermediate products of gas chromatography-mass spectrometry analysis mainly included phenol, hydroquinone, malonic acid, and oxalic acid, and the possible photolysis pathway was given accordingly. © 2019, Science Press. All right reserved.

引用

页码：685 / 692

页数：7

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