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在环境中广泛存在的三嗪类除草剂阿特拉津是目前应用最为广泛的除草剂之一,在环境中具有高持久性,对人体有致癌毒性和内分泌干扰影响。为考察溶解性腐殖酸和β-环糊精对阿特拉津光降解的影响,试验了β-环糊精、腐殖酸与阿特拉津的相互作用及腐殖酸对β-环糊精/阿特拉津光降解的影响。结果表明,阿特拉津光降解符合一级反应动力学,将阿特拉津与β-环糊精以2∶1和1∶2的摩尔比混合后,β-环糊精对阿特拉津的光降解有促进作用。加入不同浓度的腐殖酸,对阿特拉津的光降解存在抑制作用,腐殖酸浓度越大,对阿特拉津光降解的抑制作用就越明显。当阿特拉津与β-环糊精以2∶1摩尔比混合后,加入不同浓度的腐殖酸,对阿特拉津的光降解存在促进作用,降解率随腐殖酸浓度的增加而增加。
Triazine, a herbicide widely present in the environment, is currently one of the most widely used herbicides with high persistence in the environment and carcinogenic toxicity and endocrine disrupting effects on the human body. To investigate the effects of humic acid and β-cyclodextrin on the photodegradation of atrazine, the interaction between β-cyclodextrin, humic acid and atrazine and the effects of humic acid on β-ring Dextrin / Atrazine photodegradation. The results showed that the photodegradation of atrazine was in accordance with the first-order reaction kinetics. When atrazine and β-cyclodextrin were mixed in a molar ratio of 2:1 and 1:2, Tianjin photodegradation has a catalytic effect. Adding different concentrations of humic acid has inhibitory effect on the photodegradation of atrazine. The greater the concentration of humic acid, the more obvious the inhibition of photodegradation of atrazine. When atrazine and β-cyclodextrin were mixed in a 2: 1 molar ratio, adding different concentrations of humic acid could promote the photodegradation of atrazine. The degradation rate decreased with the increase of humic acid concentration increase.