有机氯化物光催化反应动力学的研究  

The Photocatalytic Degradation of Organic Chlorine Contamints and its Kinetic Model

作　　者：夏璐[1] 王双飞[2] 

机构地区：[1]广西民族学院化学与生态工程学院,广西南宁530006 [2]广西大学造纸研究所,广西南宁530005

出　　处：《中国造纸学报》2006年第1期82-88,共7页Transactions of China Pulp and Paper

基　　金：广西自然科学基金(桂科自0447015);国家自然科学基金(批准号20367001);广西民族学院科研起动基金资助项目

摘　　要：以五氯酚钠和氯代愈创木酚为目标物,在TiO2悬浮体系中对它们的暗吸附和紫外光催化氧化行为进行了研究,考察吸附和动力学的关系。实验表明,固体催化剂与溶液中组分的吸附在20 min内可以达到平衡,消除了光催化过程中吸附外扩散对反应速率的影响,得出了吸附平衡常数。研究了悬浮体系光催化反应的影响因素,获得了相关参数与反应速率间的定量关系。在实验基础上提出了有机氯化物光催化降解的动力学模型。Abstract： The photocatalytie oxidation reaction and the reference reaction in UV-inadiated Ti02 suspension system with Na-PEP and 4-chloro-2- methoxyphenol as simulating compounds were investigated. Experimental results showed that the adsorption of solid catalyst reaches equilibrium in 20 min. The adsorption equilibrium constant is expressed as K =（Cs/C0）^-βRT/Vm/C0[1-（Cs/C0）^-βRT/Vm]The reaction kinetics was studied based on Na-PCP photocatalytic degradation. The effects of initial Na-PCP concentration, dosage of catalyst TiO2, pH of solution and UV-radiation intensity etc on the reaction kinetics were investigated. Langmuir rate constant expression is k = S（1 - 0.318C0）I0^0.9477 1/R^2Rλ^2D^2-n（RRλD＋e^RRλD-1）[0.00853＋0.085e^-（pH-5.89）^2].A kinetic model is proposed from pseudo fast order Langmuir-Hinshelwood equation such as t=1/kKln（C0/C1）＋1/k（C0-C1） to describe heterogeneous photocatalytic system. Based on the proposed model, the calculated value is in accordance with that from the 4-chloro-2- methoxyphenol degradation experiments. The correlation test result is R = 0.9673, which indicates that the kinetic model is relatively rational.

关 键 词：光催化 有机氯化物 反应动力学模型 

分 类 号：X793[环境科学与工程—环境工程] TS745[轻工技术与工程—制浆造纸工程]