| 紫外线对微囊藻毒素-RR降解动力学拟合 |
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| 引用本文： | 李伟英,张明,陈玲,董秉直.紫外线对微囊藻毒素-RR降解动力学拟合[J].同济大学学报(自然科学版),2009,37(7). |
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| 作者姓名： | 李伟英 张明 陈玲 董秉直 |
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| 作者单位： | 同济大学,污染控制与资源化研究国家重点实验室,上海,200092 |
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| 基金项目： | 上海市科委世博科技专项基金，苏州市科技发展计划项目，国家水体污染控制与治理科技重大专项基金 |
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| 摘 要： | 探讨了反应时间、初始pH值、紫外线(UV)辐射强度、温度及初始质量浓度等因素对UV去除微污染水体中微囊藻毒素RR(MC RR)效果的影响.研究表明:MC RR的降解率随反应时间的延长及UV辐照度的增大而提高;pH对其降解具有重要作用,中性和弱酸性环境有利于MC RR的降解,当pH值为5时,UV对MC RR的降解效果最佳,强酸性和强碱性环境对UV降解MC RR起抑制作用;UV对MC RR的降解率随温度的升高而提高,且呈线性关系;从降解动力学角度考察,符合二级动力学模型,速率常数随MC RR溶液初始质量浓度的降低而加快.在10 ℃、辐照度为153 μW·cm-2的中性(pH=7.00)环境中,UV辐射时间在160 min时可将初始质量浓度为251.778 3 μg·L-1的MC RR溶液降解至0.801 2 μg·L-1,UV对MC RR溶液的去除率可达99.68%.
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| 关 键 词： | 微囊藻毒素 RR 紫外线 降解 动力学 微污染水体 |
Effect and Kinetic of Ultraviolet Degradation on Microcystin RR |
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| LI Weiying,ZHANG Ming,CHEN Ling and DONG Bingzhi.Effect and Kinetic of Ultraviolet Degradation on Microcystin RR[J].Journal of Tongji University(Natural Science),2009,37(7). |
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| Authors: | LI Weiying ZHANG Ming CHEN Ling and DONG Bingzhi |
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| Institution: | State Key Laboratory of Pollution Control & Resource Reuse,Tongji University,Shanghai 200092,China;State Key Laboratory of Pollution Control & Resource Reuse,Tongji University,Shanghai 200092,China;State Key Laboratory of Pollution Control & Resource Reuse,Tongji University,Shanghai 200092,China;State Key Laboratory of Pollution Control & Resource Reuse,Tongji University,Shanghai 200092,China |
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| Abstract: | The parameters,such as reaction time,pH value,UV light intensity,temperature and initial concentration are investigated on the degradation of MC RR by ultraviolet(UV) radiation in micro-polluted water,respectively.The results show that the degradation rate of MC RR is improved with the reaction time and higher UV intensity.The initial pH acted as a key factor to the degradation rate of MC RR.The neutral and weak acidic solutions were more appropriate to the degradation of MC RR,and the optimal pH value was 5 in this study.The strong acidic and alkaline solutions were inhibitory to the degradation of MC-RR.The relationship between degradation rate and temperature was linear.MC RR was removed quickly in the lower concentration solution,and the processes conform to second-order kinetics model.At the UV light intensity 153 μW·cm-2,the MC RR concentration decreased from 251.778 3 μg·L-1 to 0.801 2 μg·L-1within 160 min at pH 7.0 and 10 ℃,and the degradation rate was 99.68%. |
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| Keywords: | microcystin-RR UV degradation kinetic micro-polluted water |
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