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环境化学  2015 

纳米TiO2及ZnO悬浮液中·OH的生成

Keywords: 纳米颗粒,TiO2,ZnO,羟基自由基

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Abstract:

采用气相色谱法间接测定了光照下纳米及常规TiO2、ZnO悬浮液中·OH的产生情况.结果表明,光照下常规TiO2及ZnO悬浮液中没有检测到·OH,而纳米TiO2及ZnO悬浮液在日光灯及紫外灯照射下的·OH生成量与时间之间具有较好的线性关系,120h内溶液中·OH含量随纳米颗粒浓度(<200mg·l-1)的升高而逐渐升高;但当纳米颗粒浓度高于200mg·l-1时,·OH含量不再随纳米颗粒浓度升高而增加.本实验中不同光照条件下纳米颗粒悬浮液中·OH产生速率各不相同,其中普通日光灯照射下·OH产生速率最慢、紫外光(254nm)其次、太阳光最快,而避光条件下没有检测到·OH.同时,·OH的产生与纳米颗粒化学组成十分相关,在日光灯照射下纳米TiO2的·OH产生速率为纳米ZnO的2—4倍(200mg·l-1的纳米TiO2、ZnO在日光灯照射下的·OH生成速率分别为0.0239mmol·l-1·h-1、0.010mmol·l-1·h-1).由于·OH是活性氧簇(ROS)中毒性最强的自由基之一,所以金属纳米氧化物颗粒在不同条件下产生的ROS应作为纳米材料水生态毒理学研究的主要因素之一.

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