新型光电化学协同催化降解结晶紫

Degradation of Crystal violet with a novel photo-electro-chemical catalytic method

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30mg/L和溶液初始pH值为3时,经过120min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。

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-vis 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%—30% at conditions with Crystal violet initial concentration of 30 mg/L and initial pH of 3.0. Compared with the decolorization rate,the mineralization was slower.