纳米铁对微生物吸附的实验研究  

The Study of Microorganism Adsorbtion by Nanoscale Zero-valent Iron

作　　者：李博[1] 杨琦[1] 尚海涛[1] 王斑[1] 

机构地区：[1]中国地质大学(北京)水资源与环境学院,北京100083

出　　处：《环境科学与技术》2010年第S2期65-69,共5页Environmental Science & Technology

基　　金：国家自然科学基金资助项目(40102027;50578151);北京市自然科学基金资助项目(80520178092025;8102030);北京市教委产学研项目(51900265005);国家科技重大专项(2009ZX07207-008;2009ZX07419-002;2009ZX07207-001)

摘　　要：实验探讨了纳米铁与微生物的吸附规律,主要研究了纳米铁对革兰氏阳性菌及革兰氏阴性菌吸附的影响因素、吸附动力学、吸附等温线及吸附热力学,并对吸附机制进行了探索。结果表明细菌在纳米铁表面的吸附过程是一个快速过程,同时受反应时间、细菌浓度、温度、pH值等外部因素的影响。结果表明:微生物与无机物在相同条件下与相同量的纳米铁进行吸附反应,微生物达到平衡的时间更短,效率更高;微生物的带电性在一定程度上影响了微生物与纳米铁的吸附,革兰氏阴性菌反应平衡时间小于革兰氏阳性菌;微生物与纳米铁的吸附过程符合Fraundlich吸附模型,属于单层吸附;20℃时微生物的活性没有30℃和40℃时的活性高,但这三个温度对微生物的性质并没有明显影响。The experiment has discussed the rule of microorganism's adsorption by nano-iron,the main research is that the impact of nano-iron adsorb on gram-positive bacteria and gram-negative bacteria,the adsorption kinetics,adsorption isotherms,adsorption thermodynamics,and the microbial nano-iron absorption mechanism.The results show that the adsorption process is fast on the surface of nano-iron and it is influenced by the reaction time,the concentration of the bacteria,temperature of the environment,and other external factors.Specific conclusions are as follows: Microorganisms and minerals react with the same amount of nano-iron under same conditions,microbial can be balanced in shorter time and higher efficiency;The microbes of Gram-negative bacteria can get less adsorbing equilibrium time than Gram-positive bacteria,for they have different charges on their surfaces;The adsorption process of bacteria and nano-iron is suitable for Fraundlich isotherm equation,and it turns out that it is single-layer adsorption;The activity of microorganisms at 20℃ is lower than at 30℃ and 40℃,but apparently these temperatures have no significant impact to the character of microorganism.

关 键 词：纳米铁 微生物 吸附动力学 吸附等温线 吸附热力学 

分 类 号：X522[环境科学与工程—环境工程]