Biosorption of cadmium(II), zinc(II) and lead(II) by Penicillium simplicissimum: Isotherms, kinetics and thermodynamics.
The isotherms, kinetics and thermodynamics of Cd(II), Zn(II) and Pb(II) biosorption by Penicillium simplicissimum were investigated in a batch system. The effects of pH, initial metal ions concentration, biomass dose, contact time, temperature and co-ions on the biosorption were studied. Adsorption data were well described by both the Redlich-Peterson and Langmuir model. Chemical ion-exchange was found to be an important process based on free energy value from Dubini-Radushkevich isotherm for all metal ions. The results of the kinetic studies of all metal ions at different temperature showed that the rate of adsorption followed the pseudo second-order kinetics well. The thermodynamics constants DeltaG degrees , DeltaH degrees and DeltaS degrees of the adsorption process showed that biosorption of Cd(II), Zn(II) and Pb(II) ions on Penicillium simplicissimum were endothermic and spontaneous.
Fan
Ting
T
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China.
Liu
Yunguo
Y
Feng
Baoying
B
Zeng
Guangming
G
Yang
Chunping
C
Zhou
Ming
M
Zhou
Haizhou
H
Tan
Zhenfeng
Z
Wang
Xin
X
D000327:Adsorption; D018533:Biomass; D002104:Cadmium / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007854:Lead / Q000737:chemistry*; D015233:Models, Statistical; D010407:Penicillium / Q000737:chemistry* / Q000254:growth & development; D013696:Temperature; D013816:Thermodynamics; D015032:Zinc / Q000737:chemistry*
D002104:Cadmium; D007854:Lead; D015032:Zinc