黑曲霉对模拟废水中汞的吸附  

Adsorption of Aspergillus Niger on Mercury in Simulated Wastewater

作　　者：李盼盼[1] 臧淑艳[1] 袁博[1] 王娟[1] 姜雷[1] 

机构地区：[1]沈阳化工大学应用化学学院,辽宁沈阳110142

出　　处：《沈阳化工大学学报》2011年第1期1-5,11,共6页Journal of Shenyang University of Chemical Technology

基　　金：国家自然科学基金项目(40803037);辽宁省自然科学基金项目(20092054);中国博士后基金项目(20080440809)

摘　　要：研究Hg(Ⅱ)在黑曲霉表面的吸附行为,考察pH值、黑曲霉用量、吸附时间以及初始汞浓度对吸附的影响,并用FTIR探讨其吸附机理.结果表明:在实验pH范围内,Hg(Ⅱ)在黑曲霉表面的吸附量随体系初始pH值的升高先增大后减小;随着黑曲霉用量的增加,其吸附量逐渐增加最后达到最大值;黑曲霉对Hg(Ⅱ)的吸附是一个先快后慢的过程,1 h吸附可达到平衡.用动力学方程对Hg(Ⅱ)的吸附过程进行拟合,结果表明准二级动力学方程的拟合性最好,其相关度R2>0.999.分别用Langmuir、Freundlich和Temkin方程拟合等温吸附过程,其中Temkin方程为最佳模型.通过傅里叶红外光谱图分析,黑曲霉吸附Hg(Ⅱ)废水前后,其主要结构和成分保持完整.Adsorption characteristics of Hg（Ⅱ） on the surface of Aspergillus niger were investigated,as a function of pH,quantity of Aspergillus niger,time and initial concentrations of Hg（Ⅱ）.Mechanisms of adsorption were analyzed by Fourier Transform Infrared Spectroscopy（FTIR）.Results indicted that the adsorption amounts of Hg（Ⅱ） increased firstly and then decreased with the increasing of pH value,and with the increasing of quantity of Aspergillus niger the adsorption rate increased gradually and then reached the maximum.The adsorption of Hg（Ⅱ） on the surface of Aspergillus niger was a fast and later slow process,and reached equilibrium within 1h.The sorption kinetics of Hg（Ⅱ） could be described by two-constant equation very well and R20.999.The equilibrium adsorption of Hg（Ⅱ） on Aspergillus niger could be fitted by Langmuir equation,Freundlich equation and Temkin equation,and the best fitting was Temkin equation.After the absorption,the major components and the structure of Aspergillus niger remained intact through FT IR..

关 键 词：黑曲霉 Hg(Ⅱ) 吸附 动力学方程 等温吸附方程 

分 类 号：X703.1[环境科学与工程—环境工程]