Study on Pyrolytic Characteristics of Dead Yeast Powder and Biosorption Mechanism on Cu²+

Abstract

Pyrolysis process of dead beer yeast powder was studied through thermogravimetric analyzer. Cu 2+ adsorption mechanism was analysed by SEM and FTIR. The results showed: in thermogravimetric test, TG and DTG figures indicated five pyrolytic stages, weight losting in the third(247 -309 ) and fourth(309 -420 ) stages, most important stages, accounted for 68.3% of total weight losting and 50.5% of total sample weight. SEM figures indicated that before adsorption on Cu 2+ , the cell surface of yeast powder and immobilized yeast were smooth, but after adsorption, many "spots" and something like spininess deposition appeared on cell surface, inorganicprecipitation mechanism and redox mechanism might work in the process. After adsorption, FTIR figures changed little, the main structure and components of yeast kept unchanged, -OH -CONH 2 and -COOH all played an important role in adsorption process.

Continuous Biosorption on Copper (II) and Industrial Wastewater Treatment by Saccharomyces Cerevisiae Biomass in Upflowing Reactor

“…Here on the basis of existing results in our group [4][5][6][7][8][9], breakthrough curves of different immobilized materials, initial pH values, flow rates and diameters of immobilized products were studied on copper(Ⅱ) adsorption. Desorption tests and industrial wastewater treatment were analyzed as well for further research.…”