羟基氧化铁催化臭氧氧化去除水中阿特拉津

以实验室制备的羟基氧化铁(FeOOH)为催化剂,研究了其催化臭氧氧化去除水中痕量阿特拉津的效能,并对影响催化效果因素及降解机理进行了探讨。在本实验条件下,反应8 min时催化氧化阿特拉津的去除率比单独臭氧氧化高出63.2%,而FeOOH对阿特拉津的吸附量很小,结果表明,FeOOH对臭氧氧化水中的痕量阿特拉津具有明显的催化活性。探讨了催化剂投量、pH、阿特拉津初始浓度和重碳酸盐碱度对催化氧化阿特拉津的影响。催化剂最佳投量为150 mg/L,去除率随pH和阿特拉津初始浓度的增加而升高,重碳酸盐浓度为200 mg/L时催化作用受到明显抑制。通过研究叔丁醇对催化反应的影响间接推断了催化反应的机理,叔丁醇作为羟基自由基抑制剂有效地抑制了水中羟基自由基的生成和它对阿特拉津的氧化反应,间接证明这种催化作用遵循羟基自由基的反应机理。

Catalytic ozonation of trace atrazine in water by synthetic goethite

The catalytic ozonation of trace atrazine in the presence of synthetic goethite produced in laboratory was investigated, and influencing factors and the pathway of degradation were evaluated. The results represented that under the optimum technical conditions, the synthetic goethite showed a higher catalytic activity on ozonation of atrazine, and the removal rate of atrazine in water increased by 63.2% at reaction time of 8 min. The affecting factors included catalytic dose, pH, concentration of atrazine and bicarbonate ion on atrazine removal were examined. The optimal catalyst dosage was 150 mg/L. The removal rate of atrazine grew with increasing pH and the concentration of atrazine. But bicarbonate concentration can significantly inhibit atrazine removal with 200 mg/L. It can be deduced that tert-butanol can effectively inhibit the generation of hydroxyl radicals in water and its oxidation to atrazine as a hydroxyl radical scavenger, also indicated that the catalysis follows a hydroxyl radical pathway.