Abstract
In the paper, we investigated the adsorption of nickel by nickel-resistant strain screened in our laboratory. Results indicated that at the following conditions: pH=6, initial concentration of Ni2+ was 25mg/L, mass concentration of bacterial strain was 3g/L, adsorption approach an equilibrium after 2h，and Ni2+ removal reached up to 98.2%. Simulation of adsorption by thermodynamic models revealed that Langmuir equation can describe the adsorption process well, which showed that the adsorption was carried out mainly by means of surface adsorption. AFM detections indicated that the mycelium showed a tendency of shrinking and assembling after the adsorption, which illustrated that the adsorption mainly occurred on the surface. Meanwhile, the surface adsorption can not rule out a certain extent, affect the joint adsorption occurs in the intracellular. After Ni2+ entered the extracellular polymers and even inside the cells, the adsorption was controlled, especially in the later period.
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