紫外线对微囊藻毒素-RR降解动力学拟合
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TU 991.21

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Effect and Kinetic of Ultraviolet Degradation on MicrocystinRR
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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(MCRR)效果的影响.研究表明:MCRR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MCRR的降解,当pH值为5时,UV对MCRR的降解效果最佳,强酸性和强碱性环境对UV降解MCRR起抑制作用;UV对MCRR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MCRR溶液初始质量浓度的降低而加快.在

    Abstract:

    The parameters,such as reaction time,pH value,UV light intensity,temperature and initial concentration are investigated on the degradation of MCRR by ultraviolet(UV) radiation in micropolluted water,respectively.The results show that the degradation rate of MCRR is improved with the reaction time and higher UV intensity.The initial pH acted as a key factor to the degradation rate of MCRR.The neutral and weak acidic solutions were more appropriate to the degradation of MCRR,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.MCRR 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 MCRR 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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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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