Physio-chemical properties of adsorbing Pd2+ by Saccharomyces cerevisiae waste biomass
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Saccharomyces cerevisiae waste, biomass procured from the beer brewery, was used as the ad,sorbent for Pd2+. The physico-chemical properties of adsorbing Pd2+ by the biomass were investigated. The results indicate that the adsorption of Pd2+ by the biomass was affected by adsorption time, pH value, adsorbent concentration and Pd2+ initial concentration in the solution. The biosorption is a rapid process, the capacity of the adsorption after 45 min reached the maximum; and 92.0% of the maximal capacity was obtained at the first 3 min of the adsorption. The optimum pH value was 3.5. In the range of 5-60 degreesC, the biosorption was hot affected by temperature. The isotherm of the adsorption of Pd2+ by,the biomass followed Langmuir and Freundich models under the conditions of initial Pd2+ mass concentration (30-300 mg/L) and biomass mass concentration (2 g/L). Biosorptive capacity of 94.5 mg/g was obtained under the conditions of pH = 3.5. mass ratio of an initial Pd2+ to biomass being 0.2 and at 30 degreesC for 60 min of the adsorption. Palladium was removed from the treated solution of waste palladium catalyst with 32.2 mg/g of biosorptive capacity. The results of X-ray photoelectron spectrometer analysis indicate that the biomass could adsorb Pd2+ ions from the aqueous solution. The observation in the transmission electron microscope shows that without the extra-electron donor, the waste, biomass of Saccharomyces cerevisiae could adsorb and reduce Pd2+ ions in the solution to. microbial Pd-0 particles, which could become well-formed palladium. crystals, as well as Pd2+ ions adsorbed on the gamma-Al2O3 could be reduced to Pd-0 particles by the biomass.