Photocatalytic degradation of atrazine using suspended and supported TiO2
Photocatalytic degradation of atrazine using suspended and supported TiO2
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DOI：
10.1016/j.apcatb.2004.01.021
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发表时间：
2004-07
影响因子：
22.1
通讯作者：
S. Parra;Sarmiza Elena Stanca;I. Guasaquillo;K. Ravindranathan Thampi
中科院分区：
文献类型：
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作者：
S. Parra;Sarmiza Elena Stanca;I. Guasaquillo;K. Ravindranathan Thampi
报道了悬浮和负载tio2对6-氯- n2 -乙基- n2 -异丙基-1,3,5-三嗪-2,4-二胺（阿特拉津）的非均相光催化降解。考察了催化剂、阿特拉津浓度、pH、光照强度和温度等因素对反应的影响，确定了去除阿特拉津的最佳条件。采用高效液相色谱法（HPLC）和总有机碳法（TOC）分别监测了阿特拉津的初级降解和总矿化。阿特拉津在悬浮体系和支撑体系中均被破坏，但未观察到其完全矿化，可能是由于形成了稳定的产物氰尿酸。测定了阿特拉津降解反应的活化能为2.6kcalmol−1。比较了悬浮体系和支撑体系（支撑体系在150ml流动反应器中）的光降解效率，结果表明，使用功能化聚合物固定tio2时，其催化活性不受影响。结果表明，负载型催化剂在运行6 ~ 7次后，其活性耐久性降低，但在480℃下进行1小时的简单热处理即可完全活化。研究结果清楚地表明，在不影响原催化剂颗粒活性的情况下，固定化光催化剂确实可以用于光催化。
The degradation of 6-chloro-N2-ethyl-N4-isopropyl-1,3,5-triazine-2,4-diamine (atrazine) by heterogeneous photocatalysis using suspended and supported TiO2is reported. The influence of reaction parameters such as catalyst and atrazine concentrations, pH, light intensity and temperature has been investigated and the optimal conditions for the abatement of atrazine have been identified. The primary degradation and the total mineralization of atrazine have been monitored by high performance liquid chromatography (HPLC) and total organic carbon (TOC), respectively. Atrazine got destroyed in both suspended and supported systems, but its complete mineralization is not observed, probably due to the formation of cyanuric acid as a stable product. The activation energy for the degradation reaction of atrazine is determined as 2.6kcalmol−1. The efficiencies of photodegradation in both suspended and supported systems (the latter in a 150ml flow reactor) are compared and the results indicate that the catalytic activity of TiO2is not affected when it is immobilized using a functionalized polymer. It is observed that the durability of the supported catalyst activity is reduced after six or seven runs, but it could be fully re-activated by a simple heat treatment at 480°C for 1h. The findings clearly suggest that immobilized photocatalysts could indeed be developed for photocatalysis, without compromising on the activity of the primary catalyst particles.