新型光电化学协同催化降解结晶紫.pdf

学兔兔 化 工 进 展 ·1148· CHEMICAL INDUSTRY AND ENGINEERING PROGRESS 2010年第29卷第6期 新型光电化学协同催化降解结晶紫 刁增辉，李明玉，宋 琳，曾凡银，王心乐 (暨南大学环境工程系，广东 广州 510630) 摘 要：以TiO2／Ti薄膜电极为阳极、石墨电极为阴极，设计了一种新型的双槽光电化学协同催化反应器，用该 反应器对结晶紫溶液进行了降解研究。考察了结晶紫溶液的浓度、pH值、阴极电位等因素对结晶紫降解脱色效 率的影响，对结晶紫的脱色与矿化过程进行了初步讨论，并根据结晶紫在降解反应前后GC—MS中间产物分析和 紫外．可见光谱的变化，探讨了其催化降解过程。结果表明，在光电化学协同催化反应器中，当结晶紫溶液初始 浓度为30 mg／L和溶液初始pH值为3时，经过120 min的催化降解，其降解脱色率高达98-3％，而矿化率相对 较低，约在20％~30％，相对于结晶紫的脱色反应速率而言，其矿化过程相对缓慢。 关键词：光电催化；降解；二氧化钛；结晶紫 中图分类号：TQ 032．41 文献标识码：A 文章编号：1000—6613(2010)06—1148—06 Degradation of Crystal violet with a novel photo·—electro·-chemical catalytic method DIAOZenghui，LIMingyu，SONGLin，ZENGFanyin，WANGXinle (Department ofEnvironmental Engineering，Jinan University，Guangzhou 510630，Guangdong，China) Abstract：A novel two．．compartment photo—-electro．-chemical catalytic reactor was designed for the study of Crystal violet degradation with TiO2／Ti thin film electrode as the photo—anode and graphite as cathode．Effects of Crystal violet concentration， initial pH ， and cathodic potentials on the decolorization efficiency of Crystal violet were investigated．The decoloration and mineralization processes of Crystal violet were preliminary discussed．Based on GC／MS analysis and the change in UV—V absorption spectrum，the degradation process of Crystal violet was discussed．Experimental results showed that the decolorization ratio of Crystal violet was achieved to 98．3％ within 120minutes with a mineralization ratio of about 20％一30％ at conditions with Crystal violet initial concentration of