Removal of cadmium and zinc ions from aqueous solution by living Aspergillus niger

• Published in: Transactions of Nonferrous Metals Society of China Vol. 16; no. 3; pp. 681 - 686
• Main Author: 刘云国 樊霆 曾光明 李欣 童庆 叶菲 周鸣 徐卫华 黄玉娥
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.06.2006; School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China; Department of Environmental Science and Engineering, Hunan University, Changsha 410082, China%Department of Environmental Science and Engineering, Hunan University, Changsha 410082, China
• Subjects: Aspergillus niger; biosorption; biosorption isotherm; cadmium; kinetic model; zinc; 动力学模型; 水溶液; 生物吸着; 黑曲霉; biosorption isotherm; cadmium; Aspergillus niger; biosorption; zinc; kinetic model
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(06)60121-0

The potential of living Aspergillus niger to remove cadmium and zinc fi＇om aqueous solution was investigated. Effects of pH, initial concentration, contact time, temperature and agitation rate on the biosorption of Cd（ Ⅱ ） and Zn（ Ⅱ ） ions were studied. The optimum adsorption pH value for Cd（Ⅱ） and Zn（Ⅱ） were 4.0 and 6.0. The best temperature and agitation rate were in the range of 25-30 ℃ and 120 r/min for all metal ions. Under the optimal conditions, the maximum uptake capacities of Cd（Ⅱ） and Zn（Ⅱ） ions are 15.50 mg/g and 23.70 mg/g at initial concentrations of 75 mg/L and 150 mg/L, respectively. Biosorption equilibrium is established within 24 h for cadmium and zinc ions. The adsorption data provide an excellent fit to Langmuir isotherm model. The results of the kinetic studies show that the rate of adsorption follows the pseudo-second order kinetics.