| 防晒剂对氨基苯甲酸在硝酸根溶液中的光解研究 |
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| 引用本文： | 孟翠,季跃飞,曾超,杨曦.防晒剂对氨基苯甲酸在硝酸根溶液中的光解研究[J].环境科学,2011,32(9):2549-2553. |
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| 作者姓名： | 孟翠 季跃飞 曾超 杨曦 |
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| 作者单位： | 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;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;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;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 |
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| 基金项目： | 国家自然科学基金项目（20977045）； 近海海洋环境国家重点实验室开放课题项目（MELRS0921） |
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| 摘 要： | 以氙灯为模拟太阳光光源,研究了防晒剂分子对氨基苯甲酸（PABA）在硝酸根溶液中的光解,探讨了pH值、硝酸根离子的浓度和天然水体中广泛存在的腐殖质浓度对防晒剂PABA光解速率的影响.结果表明,PABA在硝酸根溶液中的光解反应符合一级动力学规律,PABA的光化学反应速率随硝酸根离子浓度的提高显著增大,其速率常数可由0.00...
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| 关 键 词： | 防晒剂 对氨基苯甲酸 光解 硝酸根 活性氧 |
| 收稿时间： | 2010/10/22 0:00:00 |
| 修稿时间： | 2010/12/9 0:00:00 |
Photodegradation of UV Filter PABA in Nitrate Solution |
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| MENG Cui,JI Yue-fei,ZENG Chao and YANG Xi.Photodegradation of UV Filter PABA in Nitrate Solution[J].Chinese Journal of Environmental Science,2011,32(9):2549-2553. |
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| Authors: | MENG Cui JI Yue-fei ZENG Chao and YANG Xi |
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| Institution: | MENG Cui,JI Yue-fei,ZENG Chao,YANG Xi(State key Laboratory of Pollution Control and Resource Reuse,School of the Environment,Nanjing University,Nanjing 210046,China) |
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| Abstract: | The aqueous photolysis of a UV filter p-aminobenzoic acid (PABA) using Xe lamp as simulated solar irradiation source was investigated in the presence of nitrate ions. The effects of pH, concentration of nitrate ions and concentration of humic substance in natural water on the photodegradation of PABA were studied. The results showed that photodegradation of PABA in nitrate solution followed the first order kinetics. The increasing concentration of nitrate ion increased favored the photodegradaton of PABA, of which the first order constant increased from 0.0022 min-1 to 0.0179 min-1. The photodegradation of PABA promoted with the increase of pH while the increasing concentration of humic substance showed inhibiting effect. Hydroxyl radicals determined by the molecular probe method played a very importnant role in the photolysis process of PABA. Photoproducts upon irradiation of PABA in nitrate solution were isolated by means of solid-phase extraction (SPE) and identified by LC-MS techniques. The probable photoinduced degradation pathways in nitrate solution were proposed. |
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| Keywords: | UV filter p-aminobenzoic acid(PABA) photodegradation nitrate ion reactive oxygen species |
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