Federal University of Technology - Parana, Rua Marcilio Dias, 635, 86812-460, Apucarana, Brazil.
State University of Maringa, Av Colombo, 5790, 87020-900, Maringa, Brazil.
J Environ Manage. 2020 May 15;262:110347. doi: 10.1016/j.jenvman.2020.110347. Epub 2020 Feb 29.
The increasing use of pharmaceutical products also increases their release in aquatic environment. These contaminants are considered emerging pollutants, and induce adverse ecological and human health effects. The antidiabetic metformin is one example that has been detected in the aquatic environment at unusual concentrations. This fact indicates that conventional wastewater treatment is inefficient on eliminating this compound. Here we show that metformin can be effectively removed from water by photocatalysis. We found the optimised conditions for pH and concentration of catalyst on the photocatalytic process. TiO and TiO-ZrO were successful in oxidising metformin under UV radiation following a pseudo-first order kinetics. Intermediates of metformin photodegradation appeared after photocatalytic treatment. Toxicity analysis showed that the degradation products are non-toxic to Lactuca sativa seeds.
随着药品的使用日益增加，其在水环境中的释放也随之增加。这些污染物被认为是新兴污染物，会对生态和人类健康产生不良影响。抗糖尿病药物二甲双胍就是一个在水环境中以异常浓度被检测到的例子。这一事实表明，传统的废水处理方法对于去除这种化合物的效率并不高。在这里，我们证明了光催化可以有效地去除水中的二甲双胍。我们找到了光催化过程中 pH 值和催化剂浓度的最佳条件。TiO 和 TiO-ZrO 在紫外辐射下成功地遵循准一级动力学氧化二甲双胍。光催化处理后出现了二甲双胍光降解的中间产物。毒性分析表明，降解产物对莴苣种子没有毒性。
