جهت دسترسی به کاربرگه ی زیر، از این لینک استفاده کنید. http://dl.pgu.ac.ir/handle/10722/58410
Title: Effects of dissolved oxygen, pH, and anions on the 2,3-dichlorophenol degradation by photocatalytic reaction with anodic TiO2 nanotube films
Keywords: Nanotubes - chemistry;Photochemistry;Photosensitizing Agents - chemistry;Titanium - chemistry;Hydrogen-Ion Concentration;Chlorophenols - chemistry;Catalysis;Anions - chemistry;Oxygen - chemistry
Publisher: Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/chemosphere;United Kingdom
Description: In this study, the highly-ordered TiO2 nanotube (TNT) arrays on titanium sheets were prepared by an anodic oxidation method. Under UV illumination, the TNT films demonstrated the higher photocatalytic activity in terms of 2,3-dichlorophenol (2,3-DCP) degradation in aqueous solution than the conventional TiO2 thin films prepared by a sol-gel method. The effects of dissolved oxygen (DO) and pH on the photocatalytic degradation of 2,3-DCP were investigated. The results showed that the role of DO in the 2,3-DCP degradation with the TNT film was significant. It was found that 2,3-DCP in alkaline solution was degraded and dechlorinated faster than that in acidic solution whereas dissolved organic carbon removal presented an opposite order in dependence of pH. In the meantime, some main intermediate products from 2,3-DCP degradation were identified by a 1H NMR technique to explore a possible degradation pathway. A major intermediate, 2-chlororesorcinol, was identified from the 2,3-DCP decomposition as a new species compared to the findings in previous reports. Photocatalytic deactivation was also evaluated in the presence of individual anions (NO3 -, Cl-, SO4 2 -, and H2 PO4 -). The inhibition degree of photocatalytic degradation of 2,3-DCP caused by these anions can be ranked from high to low as SO4 2 - > Cl- >H2 PO4 - >NO3 - . The observed inhibition effect can be attributed to the competitive adsorption and the formation of less reactive radicals during the photocatalytic reaction. © 2008 Elsevier Ltd. All rights reserved.;link_to_subscribed_fulltext
Other Identifiers: Chemosphere, 2008, v. 73 n. 5, p. 805-812
10.1016/j.chemosphere.2008.06.007
812
161867
WOS:000260090400025
0045-6535
5
http://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0045-6535&volume=73&spage=805&epage=812&date=2008&atitle=Effects+of+Dissolved+Oxygen,+pH,+and+Anions+on+the+2,3-Dichlorophenol+Degradation+by+Photocatalytic+Reaction+with+Anodic+TiO2+Nanotube+Films
18640697
eid_2-s2.0-51349097702
805
http://hdl.handle.net/10722/58410
73
Type Of Material: Article
Appears in Collections:Department of Chemistry

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