铁粉催化过硫酸盐降解水中阿特拉津研究

Study on Catalytic Degradation of Atrazine by Iron Powder and Sodium Peroxydisulfate

摘要: 本实验以水溶液中的阿特拉津为研究对象，采用铁粉催化氧化过硫酸钠反应体系，试验考察了水溶液中阿特拉津的去除效果。对主要试验条件，如溶液pH值、温度、时间、铁粉和过硫酸钠用量等考察的基础上，得出了阿特拉津降解最佳条件为：对初始浓度为10 mg∙L−1、初始pH为6.0的阿特拉津水溶液，按照1 L:0.6 g:10 g的溶液体积：铁粉质量：过硫酸钠质量比例进行混合反应，于常温下反应30 min以上，即可完全降解阿特拉津。铁粉的存在，可以显著地催化过硫酸钠，使其降解效果显著增强，但是过多铁粉的使用则会抑制降解效果，原因在于多余的铁粉会与过硫酸钠反应导致过硫酸钠的消耗。

Abstract: In this study, the iron powder and sodium persulfate were used to degrade the atrazine in the aqueous solution through the catalytic oxidation process. The effects of the main parameters, in-cluding solution pH, temperature, time, dosage of iron powder and sodium persulfate, were inves-tigated and the optimal condition is determined as following, i.e., for the solution with the initial atrazine concentration of 10 mg∙L−1 and the initial pH of 6.0, it can be completely removed according to the 1 L:0.6 g:10 g of solution volume: the weight of iron powder: the weight of sodium persulfate to mix and react at indoor temperature more than 30 minutes. The presence of iron powder can significantly activate sodium persulfate as a catalyst. It makes degradation effect significantly enhanced, but too much of iron powder can decrease the degradation efficiency sharply, due to the excessive consumption of sodium persulfate resulting in the activated sulphate anions for the degradation of atrazine.