五氯苯酚光催化降解的影响因素分析.pdf

化工.进展
2009年第28卷第5期
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
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研究开发
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五氯苯酚光催化降解的影响因素分析
罗进飞,于洪锋,李洪',李鑫钢
天津大学化工学院,天津3000;2精馏技术国家工程研究中心,天津300072)
摘要:研究者对海河流域水质的调查发现,五氩苯酚是检出量最多的持久性有机污染物,因此控制五氣苯酚污
染对控制海河持久性有机污染起着非常关键的作用。为此本文对五氯苯酚光催化降解的影响因素进行实验研究和
分析,首先对O2、H12O2、K2S2O8三种外加氧化剂在环境、工艺和经济三方面进行比较,研究表明O2(空气)是
较好的选择。通过正交实验对光催化降解五氟苯酚的操作条件pH值、流量、光强、催化剂用量进行研究,结果
表明,流量对光催化降解五氟苯酚的影响很小;光催化效果随着pH值得增加和光强的増加而增加;催化剂用量
对光催化降解五氩苯酚的影响存在峰值
关键词:五氯苯酚;光催化降解;正交实验
中图分类号:TQ453.21
文献标识码:A
文章编号:1000-6613(2009)05-0899-05
Analysis of influence factors of photocatalytic degradation of
pentachlorophenol
LUO Jinfei, YU Hongfeng, LI Hong,LI Xingang
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; 2 National Engineering
Research Center for Distillation Technology, Tianjin 300072, China)
Abstract: Studies on water quality of Haihe River Basin show that pentachlorophenol(PCP) has
become the major organic pollutant. As a result, to control the pollution of PCP has become vital for the
pollution control in Haihe River Basin. The influence factors of photocatalytic degradation of PCP were
studied and analyzed. First, photocatalysis assisted by three oxidants(O2, H202, K2S2O3)was
investigated in terms of techbnology, environmental impact and economy, and it showed that O2 was
the optimal choice. The reaction conditions of photocatalysis, including PH of solution, circulation flow
rate, light intensity, dosage of catalyst, were investigated with the orthogonal method. The result showed
that circulation flow rate was the least significant factor for the reaction, and the degradation rate of
photocatalytic reaction increased with the ph of solution and light intensity, and there was a peak of
dosage of catalyst
Key words: pentachlorophenol (PCP); photocatalytic degradation; orthogonal experiment
五氯苯酚( pentachlorophenol,简称PCP)是饮用水中PCP的含量不能超过0.22g/L。PCP毒
种典型的有机氯农药,属于持久性有机污染物性还在于只有极少数的微生物能降解它,且水平都
质,与其它氯代酚一起用做杀菌剂、除草剂、除海不高。PCP的广泛使用已经造成世界范围内的土
藻剂以及杀虫剂等,20世纪在全世界范围被广泛
应用。PCP在氯代酚中毒性最大,在极低的浓度收稿日期:2086-10-20:修改稿日期:200-01-
(0.1ugL)下也能导致生态系统的恶化,因此
第一作者简介:罗进飞(1976一),男,博士研究生。E-mail
luojinfei(@iu.edu.cn。联系人:李洪,博士后。E-mail
美国EPA( Environmental Protection Agency)规定 lihong tju@It63com