新型光电化学协同催化降解结晶紫.pdf

化工进展
1148
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
2010年第29卷第6期
Teen ENャ
研究开发
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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TiO2T薄腹电极为阳极、石墨电极为阴权,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-可见光语的变化,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几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。
关键词:光电催化;降解;二氧化钛;结品紫
中图分类号:TQ032.41文献标识码:A文章编号:1000-6613(2010)06-148-06
Degradation of Crystal violet with a novel photo-electro-chemical
catalytic method
DIAO Zenghui, L Mingyu, SONG Lin, ZENG Fanyin, WANG Xinle
Department of Environmental 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 TIO /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.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.
Key words: photoelectrocatalysis; degradation; titanium oxide; Crystal violet
光催化是一种新型废水处理方法,它具有很多独催化)是随后发展起来的一种有效地促进光生电子
特的优点,如降解能力强、条件温和、节能等
和空穴分离,从而增强光催化效率的方法-]。以
大量的研究表明,以粉状的TO2为光催化剂的光催负载TiO2/薄膜为阳极,以铂阴极为辅助电极,
化对众多污染物的降解十分有效剧。为了克服悬
浮态TO2粉末在处理过程中出现的难以分离阿收、收稿日期:20912-14:修改稿日期:2010.0-17
利用率低的缺点,人们更倾向于采用负载型TiO2
基金项目:因家自然科学基金(20676050)、广东省自然科学基
催化剂进行反应?。但是,其光催化降解效率偏
金(8451063201001261)及置南大学青年基金(51208028)资助
低,主要原因在于光生电子和空穴的复合率高,降
第一作者简介:刁增辉(1986-),男,硕土研究生,主要从事水处
低了TO2光催化的降解效率。光电催化(或电助光理技术研究。联系人:李明玉,教授。 E-mail limingyu203om