title: Kinetics of biosorption of cadmium on Baker's yeast.
abstract: In the present study the kinetics of biosorption of cadmium(II) ions by deactivated protonated yeast converted to sodium form was investigated for different initial concentrations of the metal ion (10-100 ppm) and different sorbent dosages (0.1-2.0 g) at a pH of 6.5. The adsorption process occurred in four distinct steps and the rates for these steps decreased sequentially. The rate of cadmium uptake in each case was pseudo-second-order with respect to metal ion concentration. The amount sorbed at equilibrium was found to be directly proportional to the initial metal ion concentration divided by the sorbent mass.
authors.affiliation: Centre for Rural Development and Technology, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi 110016, India. padmav@rdat.iitd.ernet.in
authors.forename: Padma
authors.initials: P
authors.lastname: Vasudevan
authors.forename: V
authors.initials: V
authors.lastname: Padmavathy
authors.forename: S C
authors.initials: SC
authors.lastname: Dhingra
mesh_terms: D000327:Adsorption; D002104:Cadmium / Q000378:metabolism*; D002413:Cations, Divalent / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D012441:Saccharomyces cerevisiae / Q000378:metabolism*
chemical_list: D002413:Cations, Divalent; D002104:Cadmium