阿替洛尔在硝酸根溶液中的光降解研究  

Photodegradation of Atenolol in Aqueous Nitrate Solution

作　　者：季跃飞[1] 曾超[1] 孟翠[1] 杨曦[1] 高士祥[1] 

机构地区：[1]南京大学环境学院,污染控制与资源化研究国家重点实验室,南京210046

出　　处：《环境科学》2012年第2期481-487,共7页Environmental Science

基　　金：国家自然科学基金项目(20977045);近海海洋环境科学国家重点实验室开放课题项目(MELRS0921)

摘　　要：以氙灯为模拟太阳光光源,研究了β阻滞剂阿替洛尔(ATL)在硝酸根溶液中的光解,探讨了硝酸根离子浓度、溶液pH值、碳酸氢根离子浓度和腐殖质浓度对ATL光解的影响.结果表明,ATL在不同浓度硝酸根溶液中的光解反应符合准一级动力学规律,增大硝酸根离子浓度促进了ATL的光降解率,当硝酸根离子浓度由0增至5 mmol.L-1时其速率常数由0.002 26min-1增至0.009 4 min-1;酸性或碱性溶液有利于ATL在硝酸根溶液中的光解,碳酸氢根离子浓度对光解无明显影响,而加入Suwannee富里酸(SRFA)对光解产生抑制作用.采用异丙醇作为羟基自由基分子探针检测到.OH存在于ATL光解过程中.采用SPE-LC-MS方法鉴定了ATL在硝酸根溶液中的主要光解产物,并提出了可能的光解途径.The aqueous photolysis of β-blocker atenolol（ATL） using Xe lamp as simulated solar irradiation source was investigated in the presence of nitrate ions.The effects of nitrate ion concentration,solution pH value,and concentration of bicarbonate and humic substance on the photodegradation of ATL were studied.The results showed that photodegradation of ATL in nitrate solution followed pseudo-first-order kinetics.The increasing concentration of nitrate ion promoted the photodegradation rate of ATL.The first-order rate constant increased from 0.002 26 min-1 to 0.009 4 min-1 with nitrate concentration increasing from 0 to 5 mmol·L-1.Acidic or alkaline condition of the solution favored the photodegradation of ATL.Different concentration of bicarbonate showed insignificant effect of the degradation while the increasing concentration of fulvic acid showed inhibiting effect.Hydroxyl radical was determined to be formed during the photolysis process of ATL using isopropanol as molecular probe.The main photoproducts of ATL were identified by using SPE-LC-MS techniques and possible photoinduced degradation pathways in nitrate solution were proposed.

关 键 词：Β阻滞剂 阿替洛尔 光降解 硝酸根 

分 类 号：X52[环境科学与工程—环境工程]