Abstract
Bacillus strain CR-7 of multiple metal and antibiotic resistances was isolated. Its metal adsorption under different pretreatments and immobilizations from aqueous solution was characterized. Pretreatment with NaOH (0.1molL−1) significantly improved Cu2+ adsorption capacity of the bacterial biomass. Sodium alginate (2%) was the ideal immobilization matrix. The immobilized and pretreated biomass had an obvious “orderliness”, following the order of Cu2+>Zn2+ in the solution containing these two metals, and following the order of Pb2+>Al3+>Cr6+>Cu2+>Fe3+>Zn2+=Ni2+>Cd2+=Co2+>Mn2+ in the solution containing these 10 metals. ΔH° and ΔS° of Cu2+ adsorption were +7.68J/mol and +16.628J/molK, respectively. The infrared peak of –N–H shifted greatly after Cu2+ adsorption. After adsorption treatment, some molecular groups disappeared in un-immobilized biomass but were still present in the immobilized biomass. Cu2+ adsorption fit both Langmuir and Freundlich isotherm models. It was concluded (1) that the Cu2+ adsorption process was endothermic, (2) that –N–H is a most important Cu2+-binding group, (3) that immobilization prevents loss or damage of the Cu2+-binding molecular groups, and (4) that Cu2+ adsorption of pretreated and immobilized biomass is homogeneous.
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