丁二酸酐修饰啤酒废酵母菌去除Cu^(2+)、Cd^(2+)的性能研究

Modified biomass 1 consisting of waste beer, s yeast cross-linked with glutaraldehyde and modified by succinic anhydride was prepared. Subsequently, modified biomass 2 was obtained by treatment of biomass 1 with saturated NaHCO3. Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopies were used to characterize the modified biomass. The effects of various experimental parameters (including temperature, initial pH, contact time and the metal ion concentration) were examined. The adsorption process of the pristine and unmodified yeast was investigated by using the pseudo second order kinetic mode, which pvoved that it was monolayer chemisorption. At 25℃ and pH＞4, the adsorption capacities of the modified biomass for Cu^(2+) and Cd^(2+) were found to be 39.1 and 60.8 mg/g, respectively, which were about 3.3 and 11.5 times respectively higher than that of the pristine adsorbent. When the biosorbent, modified biomass, was used to treat wastewater, containing Cu^(2+) and Cd^(2+) under the same condition, the average removal rate were over 95%.