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[Photolysis Mechanism of p -Nitrophenol by Nitrocellulose Membrane in Aqueous Solution].
- Source :
-
Huan jing ke xue= Huanjing kexue [Huan Jing Ke Xue] 2019 Feb 08; Vol. 40 (2), pp. 685-692. - Publication Year :
- 2019
-
Abstract
- 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 <superscript>-4</superscript> , which is approximately 1.86 times higher than that from TiO <subscript>2</subscript> . The photolysis rate of p -nitrophenol in the presence of NCM was 0.0055 min <superscript>-1</superscript> , which is much higher than that in pure water (9.52×10 <superscript>-4</superscript> min <superscript>-1</superscript> ). 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 0.0165 min <superscript>-1</superscript> ; the corresponding degradation of p -nitrophenol exceeded 90% in 120 min. The effects of dissolved substances on photolysis were significantly different. NO <subscript>3</subscript> <superscript>-</superscript> 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.
Details
- Language :
- Chinese
- ISSN :
- 0250-3301
- Volume :
- 40
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Huan jing ke xue= Huanjing kexue
- Publication Type :
- Academic Journal
- Accession number :
- 30628331
- Full Text :
- https://doi.org/10.13227/j.hjkx.201807031