摘要 目的以自然水体培育生物膜,研究了该生物膜对铜铁的吸附特性。方法采集自然水体培育的生物膜,对模拟配制的含铜铁的实验用废水进行吸附实验。在吸附过程中分别改变pH,反应时间,温度等因素,得到最佳的吸附条件,并在此基础上进行吸附等温线和动力学研究。结果生物膜对铜铁的吸附量分别随pH、温度的升高表现出先增加后降低。随着吸附时间的延长,在早期生物膜与金属离子的反应速率较快,之后趋于平稳。吸附实验开始前30分钟内,pH=5~6,温度25~45℃,为吸附的最佳条件。Langmuir和Freundlich两种吸附等温式均能准确表达生物膜对Fe2+和Cu2+的吸附过程,但Langmuir模型表现出更好的拟合度。吸附动力学符合准二级动力学方程,相关系数分别为R2 Fe=0.9996,R2 Cu =0.9953。结论在最适反应条件下,生物膜对铜铁有较高的去除率,并且对铁的吸附量高于铜。
Abstract：Objective To study the adsorption characteristics of Cu 2+ and Fe2+ by biofilms in natural water. MethodsThe biofilm was cultured in natural water as the adsorbent for the removal of Fe2+ and Cu2+ in the water prepared by simulating the waste water containing Fe2+ and Cu2+ from laboratory. The optimal reaction conditions were accessed by changing pH, reaction time, temperature and so on. And on this basis, the adsorption isotherm and kinetics were studied. ResultsWith the rise of pH and temperature, the biosorption capacity of the biofilm increased first and then decreased. With the extension of the contact time, the reaction rate of the biofilm with Fe2+ and Cu2+ speeded first and tended to be stable then. The optimal reaction conditions were pH=5~6, temperature between 25~45℃and reaction time within 30 minutes. Both Langmuir and Freundlich model could accurately express the biosorption process of the biofilm for Fe2+ and Cu2+, and the Langmuir equation fitted better. The adsorption kinetics conformed to the quasi-second-order kinetic model, and the correlation coefficients were R2 Fe=0.9996,R2 Cu =0.9953. Conclusions In the optimal reaction conditions, biofilm has efficient removal rate for Fe2+ and Cu2+. Its adsorption capacity for Fe2+ is greater.
刘雨果,潘厚军,杜进林,罗皓,翟璐. 自然水体生物膜对铜铁的吸附特性[J]. 实用预防医学, 2015, 22(5): 533-536.
LIU Yu-guo, PAN Hou-jun, DU Jin-lin, LUO Hao, ZHAI Lu. Adsorption characteristics of Fe2+ and Cu2+ by biofilms in natural water. , 2015, 22(5): 533-536.
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