摘要：In the present study, the dead biomass of the two yeast species viz., Candida rugosa and Cryptococcuslaurentii were subjected to various chemical treatments to assess the effects of pretreatment on zinc(II)removal from aqueous solution. Yeast biomass was pretreated with anionic surfactants viz., sodium dodecylsulphate (SDS), sodium dodecyl benzene sulphonate (SDBS) and dioctyl sulphosuccinate sodium (DSS),alkali (sodium hydroxide, sodium carbonate and sodium bicarbonate), acids (hydrochloric acid, sulphuricacid and acetic acid), and organic solvents viz., methanol, formaldehyde and gluteraldehyde. Pretreatmentof dead yeast biomass with anionic surfactants was found to improve the zinc(II) removal remarkably comparedto all other treatments. Acid treatments resulted in significant reduction in zinc(II) removal efficiency. Thepattern of zinc(II) removal efficiency of both the yeast species was found to follow the order: SDS (3 mM) >SDBS (3 mM) > DSS (3mM) > Na 2 CO 3 (9 mM) ≥ NaOH (9 mM) ≥ untreated biomass > C 2 H 5 O 8 (7 mM) ≥NaHCO 3 (9 mM) > CH 3 OH (7 mM) > HCHO (7 mM) > CH 3 COOH (5 mM) > HCl (5mM) > H 2 SO 4 (5 mM).Maximum zinc(II) removal was noted in case of SDS treated C. rugosa and C. laurentii which exhibited 84.7% and 74.5 % zinc(II) removal compared to the removal efficiency of 65.4 % and 54.8 % obtained byuntreated C. rugosa and C. laurentii .
