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光电化学协同催化降解甲基橙的研究
引用本文:李明玉,尚薇,王心乐,苏有武,宋琳,张渊明.光电化学协同催化降解甲基橙的研究[J].中国环境科学,2009,29(5):512-517.
作者姓名:李明玉  尚薇  王心乐  苏有武  宋琳  张渊明
作者单位:1. 暨南大学环境工程系,广东,广州,510630
2. 暨南大学化学系,广东,广州,510630
摘    要:以TiO2/Ti薄膜电极为阳极、石墨电极为阴极、饱和甘汞电极为参比电极,设计了一种新型的双槽光电化学协同催化反应器,考察了阴极电位、反应时间、电解质浓度、溶液pH值等因素对甲基橙降解效果的影响.结果表明,电解质浓度对甲基橙的降解脱色效果影响不明显,而阴极电位、溶液pH值和反应时间则影响显著;色度为200度的甲基橙溶液,在阴极电位(Ec)为-0.6V、阴极槽初始pH3.0和阳极槽初始pH5.6、反应90min的条件下,阴极槽和阳极槽中甲基橙的脱色率分别为98.3%和51.3%,与仅靠TiO2/Ti薄膜阳极对有机物进行催化降解的“双槽单效”光电催化反应器相比,对甲基橙的催化氧化降解效率显著提高.降解前后的紫外-可见吸收光谱的变化表明,该双槽光电化学协同催化反应器不但可以同时使阴、阳两槽中的甲基橙脱色,且其苯环结构也被降解和矿化.

关 键 词:光电化学协同催化  催化降解  甲基橙  
收稿时间:2008-10-06;

The degradation of methyl orange with photo-electro-chemical synergistic catalysis system
LI Ming-yu,SHANG Wei,WANG Xin-le,SU You-wu,SONG Lin,ZHANG Yuan-ming.The degradation of methyl orange with photo-electro-chemical synergistic catalysis system[J].China Environmental Science,2009,29(5):512-517.
Authors:LI Ming-yu  SHANG Wei  WANG Xin-le  SU You-wu  SONG Lin  ZHANG Yuan-ming
Abstract:A new two-tank photo-electro-chemical catalytic reactor was designed. TiO2/Ti thin film electrode was used as photo-anodes, and graphite as cathode and a saturated calomel electrode (SCE) as the reference electrode in the reactor. The effects of cathodic potential, electrolyte concentration, reactive time and pH on the decolorization rate of methyl orange were investigated. Degradation of methyl orange was little influenced by the the electrolyte concentration, while obviously affected by cathodic potential, reactive time and pH value. Under the conditions of cathodic potential Ec-0.6V, initial solution pH3.0 in cathodic compartment and pH5.6 in anodic site, the highest decoloring rate of the methyl orange with 200 colourity was 98.3% and 51.3% in cathodic and anodic compartment respectively when the catalytic reaction time was 90min. Compared with the“two compartment and single effect” photoelectrocatalytic reactor only having photo-oxidation with TiO2/Ti anodic electrode, the new reactor obviously enhanced the degradation rate of methyl orange. The change of UV-Vis spectra showed that methyl orange in anode and cathode was not only decolored, but also the phenyl was degraded.
Keywords:photo-electro-chemical synergistic catalysis  catalysis degradation  methyl orange
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