纳米TiO_2光催化降解乐果影响因素的研究  

Influence factors of nano-TiO_2 photocatalytic degradation of dimethoate

作　　者：王金翠[1] 王欣[1] 杜银花[1] 刘宝林[1] 

机构地区：[1]上海理工大学食品质量与安全研究所,上海200093

出　　处：《应用化工》2012年第9期1540-1544,共5页Applied Chemical Industry

基　　金：上海市自然基金项目(10ZR1420700);上海市研究生创新基金项目(JWCXSL1102)

摘　　要：以悬浮态TiO2为光催化剂,在紫外光的照射下催化降解乐果,研究了乐果初始浓度、纳米TiO2添加量、反应体系温度、初始pH及通入空气等因素对乐果降解率的影响。结果表明,与反应体系温度和体系初始pH相比,纳米TiO2添加量和乐果初始浓度对乐果降解效果影响较大;不同流速空气通入均能使乐果降解率在0～20 min反应阶段有较大幅度的提高;当纳米TiO2添加量为0.1 g/L,乐果初始浓度为20 mg/L,反应体系温度为30℃,初始pH为6.5的条件下,再辅以空气(2.5 L/min)通入,反应60 min后,乐果降解率可达97.15%。The photocatalytic degradation of dimethoate, an organophosphorous pesticide, was investigated in aqueous solution by using TiO2 as a photocatalyst. The effects of TiO2 concentration, initial dimethoate concentration, temperature, initial pH value and bubbling air on the photodegradation efficiency have been examined. The results indicated that the photocatalytic effect of TiO2 concentration or initial dimethoate concentration was more significant than that of temperature or initial pH value, and the photodegradation efficiency of dimethoate could be further accelerated in 0 ~ 20 rain reaction stage by bubbling air into the system. When the initial dimethoate concentration was 20 mg/L, the TiO： concentration was 0.1 g/L, while keeping the reaction solution at 30 ℃ and the initial pH value at 6.5, and bubbling air velocity was 2.5 L/min,the degradation efficiency of dimethoate could be 97.15% within 60 min.

关 键 词：乐果 光催化降解 纳米TIO2 

分 类 号：TQ450.9[化学工程—农药化工] O644.19[理学—物理化学]