Multiple effect of pH on photocatalytic degradation of Orange II using TiO2
The performance of UV/TiC>2 (100 mg/L TiO2) process for Orange II degrdation was emphatically compared at pH 2.3,6.9 and 11.5 by means of UV-Visible spectra,ionic chromatography,TOC,and HPLC analyses.The results revealed that the reaction intermediates were produced in different contents with the increasing reaction time due to the different pH conditions.The dye was oxidized more completely at pH 2.3 while the highest color removal percentage was achieved at pH 11.5.It was proved that active electrons,which is photo-generated along with positive holes on TiO2,not only contribute to the discoloration and mineralization of the dye due to the producing of oxidative species such as O2·- and ·OOH,but also contribute to the discoloration of Orange II as reductive species.The most possible mechanism was put forward to explain the key roles of active electrons in dye degradation by UV/TiO2 process at pH 2.3 and 11.5.
ultraviolet irradiation TiO2 photocatalysis Orange II
Guoting Li Fazhan Li PeiyongZhang Yunxia Li Chao Yuan
Department of Environmental and Municipal Engineering,North China University of Water Conservancy an College of Sciences,Henan Agricultural University,Zhengzhou 450002,China
国际会议
哈尔滨
英文
1878-1883
2010-07-24（万方平台首次上网日期，不代表论文的发表时间）