亚铁活化次氯酸钠降解土壤中阿特拉津

通过考察NaClO添加量、n（Fe2+）:n（NaClO）、反应时间、土壤pH、腐植酸与无机阴离子对阿特拉津降解效率的影响，对比Fe2+/NaClO氧化处理后土壤微生物群落的变化情况，探究了FeSO₄活化NaClO对土壤中阿特拉津的降解性能。结果表明:当NaClO添加量为10 mmol，n（Fe2+）:n（NaClO）为1:1时，阿特拉津降解效率最佳，为82%；其降解符合一级反应动力学模型；Fe2+/NaClO体系比单独的NaClO可产生更多的·OH参与阿特拉津降解；降解过程受土壤pH（3~9）影响较小；腐植酸和无机阴离子（Cl-、HCO₃-）对阿特拉津降解有消极影响。经过Fe2+/NaClO处理后土壤微生物门类丰度发生明显变化，如Proteobacteria门丰度由25.46%变化为72.73%。

DEGRADATION OF ATRAZINE BY FERROUS ACTIVATED SODIUM HYPOCHLORITE

This study investigated the feasibility of atrazine degradation in soil by using Fe2+-activated hypochlorite (NaClO). The effect of main factors such as oxidant dosage, the Fe2+ to NaClO molar ratio, initial soil pH, etc. on the degradation of atrazine was considered. The results showed that after 8 h reaction, 82% of atrazine could be degraded when NaClO dosage was 10 mmol at Fe2+/NaClO molar ratio of 1:1. The degradation of atrazine followed the pseudo-first-order model. ESR result confirmed that the Fe2+/NaClO system yielded more HO· than that of NaOCl alone to participate in atrazine degradation. The Fe2+/NaClO process could operate over a wide pH range (3~9), while humic acid and inorganic anions (Cl-, HCO₃-) in the soil matrix had a negative effect on atrazine degradation. After the Fe2+/NaClO treatment, the soil microbial community was obviously affected, and the relative abundance of Proteobacteria rose from 25.46% to 72.73%.