满江红鱼腥藻吸附低浓度铀的研究

满江红鱼腥藻吸附低浓度铀的研究

摘要

摘要: 用蓝细菌满江红鱼腥藻为吸附材料，研究了时间、ｐＨ、阳离子、阴离子等对水相中低浓度Ｕ（Ⅵ）的吸附影响。实验结果表明，满江红鱼腥藻对浓度低于５．５ｍｇ／Ｌ铀吸附迅速，平衡时间不超过２ｍｉｎ；富集铀酰离子的最佳ｐＨ范围在５．０—８．５，铀酰离子可能以［ＵＯ２ＯＨ］＋形式与藻细胞结合；Ｌｉ＋、Ｎａ＋、Ｋ＋、ＮＨ４＋不与ＵＯ２＋２竞争；Ｃｕ２＋、Ｃｄ２＋、Ｍｎ２＋、Ｚｎ２＋使满江红鱼腥藻的吸附容量下降；Ｃｌ－、ＳＯ２－４、ＮＯ－３不影响藻细胞对铀的吸附；经过简单串级，３．５‰—４．５‰鲜藻可将模拟废水中的铀从５．５ｍｇ／Ｌ降低至０．０５ｍｇ／Ｌ。

Abstract: BIOSORPTION OF URANIUM AT LOW CONCENTRATION BY ANABAENA AZOLLAEZhang Xiaozhi Luo ShanggengYang Qun Zhang Huaili Li Jinying(China Institute of Atomic Energy,P.O.Box 275(48),Beijing 102413)Shi Dingji(Beijing Institute of Botany,The Chinese Academy of Sciences,Beijing 100044)Wang Wenqing(Department of Technical Physics,Peking University,Beijing 100871)ABSTRACTAbsorption of UO2＋2 from dilute solution by anabaena azollae is completed within 2 minutes.The optimum pH is among 5-8.5,which suggested that UO2OH＋ is the major form to be bound by anabaena azollae.Li＋、Na＋、K＋ and NH＋4 or F－、Cl－、SO2－4 and NO－3 have not obvious effect on the absorption of uranium.Cu2＋、Cd2＋、Mn2＋ and Zn2＋ decreased the absorpted capacity of uranium by anabaena azollae.Fresh cells of 3.5-4.5 g/L (in dry weight) is able to attenuate uranium in simulated wastewater from 5.5 mg/L to 0.05 mg/L after 4-7 serial experiments.Key words Anabaena azollae Biosorption Uranium(Ⅵ) Simulated wastewater

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