Photocatalytic activity of synthesized nanosized TiO₂ towards the degradation of herbicide mecoprop

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• 作者：Topalov ; Andjelka S. ; &Scaron ; ojic ; Daniela V. ; Molná ; r-Gá ; bor ; Dó ; ra A. ; et. al.
• 关键词：Photocatalytic degradation ; Nanosized TiO₂ ; Mecoprop ; Water treatment
• 刊名：Applied Catalysis B ; Environmental
• 出版年：2004
• 期刊代码：4_09263373
• 类别：ce
• 出版时间：December 8, 2004
• 卷：54
• 期：2
• 页码：125-133
• 文件大小：219 K

摘要

The kinetics and possible mechanism of the photocatalytic degradation of herbicide mecoprop, in UV illuminated aqueous colloids of synthesized nanosized TiO₂ were investigated. The rate of degradation was studied by ¹H NMR, UV spectrometry, as well as by potentiometric titrimetric determination of generated chloride. The catalyst dosage and effects of other kinetic factors on the photocatalytic degradation, such as initial substrate concentration, temperature and type of TiO₂ were investigated as well. The degradation rates were found to be strongly influenced by the above parameters. It was found that photocatalytic efficiency is lower and that a smaller number of observed organic intermediates (only 4-chloro-2-methylphenol and acetic acid) was detected than those observed in the presence of TiO₂ (Degussa P-25). Kinetics of the degradation were also monitored for direct photolysis, as well as for solar degradation in the presence and in the absence of TiO₂.