米曲霉菌体吸附没食子酸的机制研究  

STUDY ON ADSORPTION MECHANISM OF GALLIC ACID BY Aspergillus oryzae MYCELIA

作　　者：庞巧霞[1] 张志才[1,2] 李敏[1] 

机构地区：[1]江苏大学农产品加工工程研究院,镇江212013 [2]北京绿科天成生物有限公司,北京102300

出　　处：《离子交换与吸附》2014年第4期325-333,共9页Ion Exchange and Adsorption

基　　金：国家自然科学基金(31101269);江苏省自然科学基金(BK2011154)

摘　　要：用米曲霉CGMCC5992活菌体作为生物吸附剂,吸附含没食子酸的废水。研究了菌体量、初始pH值、时间、起始浓度对吸附效果的影响。通过吸附动力学、热力学模型拟合,并结合扫描电镜(SEM)分析,初步探讨其吸附机理。结果表明,在菌体量8g/L,初始pH=3,起始浓度100mg/L,吸附6h条件下,去除率达到93.40%。米曲霉对没食子酸的吸附符合Langmuir模型,其最大吸附量可达20.24mg/g。吸附动力学可用准二级动力学方程描述。SEM显示,吸附后,米曲霉菌丝球形态以及菌体表面结构发生了改变。In order to solve the problem of gallic acid-contaminated wastewater, bioactivemycelia of Aspergillus oryzae （.4. oryzae） CGMCC5992 was used as a kind of bio-adsorbent.Effects of pH, mycelium content, treatment time and initial concentration of gallic acid onremoval efficiency of gallic acid were studied. The adsorption mechanism was investigated bykinetic and isotherm model simulation and scanning electron microscopy （SEM）. The resultsshowed that the removal efficiency was 93.41% under the optimal conditions, such as initial pHvalue of 3, mycelium content of 8g/L, initial concentration of gallic acid of 100mg/L andtreatment time of 6h. The biosorption equilibrium of gallic acid with mycelia could be describedby Langmuir model and the maximum removal capacity was 20.24mg/g. The bisorption processof mycelia followed the Pseudo-second-order kinetics equation. SEM images indicated that themorphology and surface structure ofmycelium changed after adsorption ofAspergillus oryzae （A.oryzae） CGMCC5992.

关 键 词：没食子酸 米曲霉CGMCC5992 生物吸附 吸附动力学 

分 类 号：O643.7[理学—物理化学]