| 水环境中碳纳米管对沙丁胺醇光降解的影响 |
| 摘要点击 2219 全文点击 1031 投稿时间：2015-01-09 修订日期：2015-03-17 |
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| 中文关键词 碳纳米管 光降解 铁离子 沙丁胺醇 单线态氧 |
| 英文关键词 carbon nanotube photodegradation iron ion salbutamol singlet oxygen |
| 作者 | 单位 | E-mail | | 汪祺 | 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 210023 | wanghuangshu@126.com | | 韩佳芮 | 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 210023 | | | 魏博凡 | 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 210023 | | | 周磊 | 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 210023 | | | 张亚 | 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 210023 | | | 杨曦 | 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 210023 | yangxi@nju.edu.cn |
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| 中文摘要 |
| 选取沙丁胺醇 (salbutamol,SAL)为目标污染物, 研究了3种碳纳米管(CNTs,单壁碳纳米管SCNT、羟基衍生化多壁碳纳米管MWNT-OH和羧基衍生化多壁碳纳米管MWNT-COOH)对有机污染物在模拟太阳光照下降解的影响; 并且研究了CNTs与天然水体中光活性物质三价铁离子(Fe3+)的相互作用. 结果表明,3种CNTs能够通过竞争吸收光子,即光屏蔽作用抑制SAL光解; 同时又能通过光致激发产生单线态氧(1O2)促进光解反应,两种作用机制同时存在,在绝大多数情况下,抑制作用占主导地位. 此外,CNTs还能通过静电吸附作用使水体中的光活性物质Fe3+失活,从而影响有机污染物在天然水体中的光化学行为. |
| 英文摘要 |
| The influence of CNTs on the photolysis of organic pollutant was investigated by studying the photodegradation kinetics of SAL under 1000 W Xenon lamp, in the presence of three kinds of CNTs(SCNT, MWNT-COOH, MWNT-OH). In addition, the interaction between CNTs and Fe3+ was also investigated. The results showed that the photodegradation of salbutamol followed pseudo-first-order kinetics, which could be inhibited by all three kinds of CNTs through light screening effect. Formation of singlet oxygen was detected during the photolysis, using the molecular probe furfuryl alcohol. All three kinds of CNTs could absorb electrons through competition, i.e., inhibit SAL photodegradation by light screening effect; meanwhile, the CNTs could generate singlet oxygen through photoexcitation to promote the photodegradation reaction. Both mechanisms coexisted, and in most cases, the inhibition effect was dominant. In addition, CNTs could inactivate the photoactive substance Fe3+ in the water body by electrostatic adsorption, and affect the photochemical behavior of organic pollutants in natural water body. |
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