Characteristics and mechanism analysis of modified Streptomyces erythreus adsorbing Pb2+

摘要

Using Streptomyces erythreus isolated from pharmaceutical residues as biosorbent, the characteristics and mechanism of its absorbing Pb2+ was studied. The results showed that absorptive ability of bacterial mycelia modified by sodium hydroxide was improved greatly. The optimum conditions should be 0.2 g dosage of bacterial mycelia, time 10 min, pH value 3.5 and room temperature under initial Pb2+ of 11.8 mg/L when its absorptive capacity decreased fastest. The reaction mechanism of modified bacterial mycelia uptake Pb2+ was analyzed by back scattered electron (BSE) and infrared spectroscopy (IR). The results of experiments indicated that some chemical groups such as -COO-, C-H and O-H among cell walls of bacteria] mycelia might play the key functions adsorbing Pb2. It was presumed that the process of modified bacterial mycelia lead uptake might be a chemical and physical process collaboratively which occurred on the cell surface of bacterial mycelia chiefly based on exchangeable reaction.