摘要
研究了紫外微臭氧工艺降解微囊藻毒素(MC)的动力学过程与特性.结果表明:MC-RR,MC-YR和MC-LR三种MC在紫外微臭氧反应器中的降解过程为一级动力学反应,半降解时间分别为74.5,32.2和24.2min;降解速率不受初始藻毒素浓度的影响,湖水中天然有机物(NOM)能捕获自由基,抑制MC的降解,葡萄糖对MC的降解没有影响;紫外微臭氧工艺主要通过HO·等自由基对MC侧链Adda基中不饱和共轭双键的破坏而降解MC,并使藻毒素脱毒.紫外微臭氧工艺可用于降解饮用水中MC.
The degradation dynamics and character of microcystins (MC) in an UV-microO3 reactor with low concentration ozone generated from dry air by UV-radiation (λ = 253.7 nm) are discussed. The results show that the photochemical degradation of MC can be characterized by pseudo-first order reaction kinetics. The reaction half lives for MC-RR, MC-YR and MC-LR are 74.5, 32.2, 24.2 min, respectively. The MC degradation is not affected by the original concentration of MC in the water, however, NOM (normal organic matter) in the water, which captured the hydroxyl radicals, would decelerate the MC degradation. In the UV-microO3 process, the decrease of MC concentration is due to the destruction of the conjugated double bond on the Adda side chain by hydroxyl radicals. The UV-microO3 process can be used for the decomposition of MC in potable water.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第3期438-441,共4页
Journal of Southeast University：Natural Science Edition
基金
国家高技术研究发展计划(863计划)资助项目(2002AA601130)
国家自然科学基金资助项目(59978007)
南京大学污染控制与资源化研究国家重点实验室开放基金资助项目.
