催化降解水中有机污染物生成CO_2的测定

Measurement of CO_2 Produced from Catalyzing Degradation of Organic Pollutants in Water

设计了一套简易的装置和改进的方法来检测催化降解有机污染物过程中最终矿化所产生二氧化碳的量.利用四氮杂卟啉铁(FePz(dtn)4)负载在离子交换树脂上来活化分子氧降解了水中难降解的有机污染物对硝基苯甲酸(NBA).采用饱和的氢氧化钡溶液来吸收有机物降解反应中所产生的二氧化碳,同时用沉淀分离滴定法来测定生成二氧化碳的量,即可计算出有机污染物降解的矿化率,其方法误差为4.2%.实验表明:在可见光光照7h后,对硝基苯甲酸碱性溶液中的矿化率可达到11.3%.

A set of simple equipment and improved process were designed, in which the content of CO_2 produced from mineralization of organic pollutants was measured during catalyzing degradation of them. Iron tetra-(1,4-dithin)- tetraazaporphyrin [FePz(dtn)_4] carried on the ion-exchange resin was used to activate dioxygen for degrading organic pollutants p-nitrobenzoic acid (NBA) in water. The CO_2 produced from degradation of organic pollutants was absorbed by saturated barium hydroxide solution, and then the amount of CO_2 was measured by titration of the deposition, from which the mineralization rate of organic pollutants was calculated. The relative standard deviation of the process is 4.2%. It is shown that the mineralization rate of NBA came up to 11.3% in alkaline solution for 7hrs under irradiation of visible light in the presence of (FePz(dtn)_4.)