摘要
The potential of living Aspergillus niger to remove cadmium and zinc from 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.
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.
出处
《中国有色金属学会会刊：英文版》
EI
CSCD
2006年第3期681-686,共6页
Transactions of Nonferrous Metals Society of China
基金
Project(04JJ3013) supported by the National Natural Science Foundation of Hunan, China
Project(2001AA644020) supported by the National High-Tech Research Development Program of China
关键词
黑曲霉
生物吸着
镉
锌
动力学模型
水溶液
Aspergillus niger
biosorption
cadmium
zinc
biosorption isotherm
kinetic model
作者简介
Corresponding author： LIU Yun-guo; Tel： ＋88-731-8649208; E-mail： Liuyunguo@hun.cn
