Efficient photodegradation of 2,4-dichlorophenol in aqueous solution catalyzed by polydivinylbenzene-supported zinc phthalocyanine
✍ Scribed by Lin Wu; Aimin Li; Guandao Gao; Zhenghao Fei; Shirong Xu; Quanxing Zhang
- Book ID
- 103834672
- Publisher
- Elsevier Science
- Year
- 2007
- Tongue
- English
- Weight
- 521 KB
- Volume
- 269
- Category
- Article
- ISSN
- 1381-1169
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✦ Synopsis
In this study, photodegradation of 2,4-dichlorophenol (2,4-DCP) in aerated aqueous solution at pH 13 in the presence of hydrogen peroxide catalyzed by polydivinylbenzene-supported zinc phthalocyanine (PDVB-ZnPc) prepared from chloromethylated polydivinylbenzene and zinc phthalocyanine via a Friedel-Crafts reaction has been investigated. The reaction intermediates were identified by gas chromatography-mass spectrometry (GC-MS). The reactive oxygen species involved in the reaction were determined by electron paramagnetic resonance (EPR) technique. Based on the experimental results obtained, PDVB-ZnPc was found to be effective for removing and mineralizing the toxic 2,4-DCP in aqueous solution. The removal yield amounted to 98% after 4 h of irradiation. The reaction followed pseudo-first-order kinetics, and was well fitted into the Langmuir-Hinshelwood-type equation. The optimal concentration of PDVB-ZnPc was 1.0 g/l. The reaction intermediates were some biodegradable organic acids which were subsequently mineralized to CO 3 2-and Cl -in alkaline solution. Hydroxyl radical and superoxide anion radical other than singlet oxygen were probably generated during the photodegradation of 2,4-DCP in our reaction system.