自然水体生物膜对铜铁的吸附特性  

Adsorption characteristics of Cu^(2+) and Fe^(2+) by biofilms in natural water

作　　者：刘雨果[1] 潘厚军[2] 杜进林[1] 罗皓[1] 翟璐[1] 

机构地区：[1]广东医学院公共卫生学院,广东东莞523000 [2]中国水产科学研究院珠江水产研究所

出　　处：《实用预防医学》2015年第5期533-536,共4页Practical Preventive Medicine

基　　金：湛江市科技攻关计划项目(2013B01248);广东医学院面上项目(No.M2011008);广东省鱼病防治专项资金

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p H、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p H、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 min内,p H=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R2Fe=0.9996、R2Cu=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。Objective To study the adsorption characteristics of Cu2 ＋and Fe2 ＋by biofilms in natural water. Methods The 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 p H,reaction time,temperature and so on. And on this basis,the adsorption isotherm and kinetics were studied. Results With the rise of p H 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 p H = 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 R2Fe= 0. 9996,R2Cu=0. 9953. Conclusions In the optimal reaction conditions,biofilm has efficient removal rate for Fe2 ＋and Cu2 ＋. Its adsorption capacity for Fe2 ＋is greater.

关 键 词：生物膜 Fe2+ CU2+ 吸附等温线 吸附动力学 

分 类 号：R12[医药卫生—环境卫生学]