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Effect of external electric current on adsorption of lead by Penicillium polonicum

Abstract Lead is a major source of environmental pollution that has recently been the focus of a great deal of research. Bioremediation has been shown to be effective in remediation of lead pollution. Penicillium polonicum is a fungus with highly efficient adsorption of lead. In this study, the influence of electric current on the growth characteristics and adsorption of lead by the strain were investigated through applying different external voltages (1.5, 1.25, 1.0, 0.75, and 0.5 V). The results indicated that the electric current with voltage ranges from 1.0 to 1.25 V could promote the adsorption of lead. In addition, morphological characteristics and the quantity of lead-containing minerals formed on the surface of P. polonicum differed greatly under different experimental conditions. Further, the electric current intensity and electric energy consumption at voltages of 1.0, 1.25, and 1.5 V were higher than the blank control group, suggesting that the strain could utilize the energy supplied by an external electrochemical workstation to improve lead adsorption. After applying an external current, the lead adsorption of P. polonicum was affected by electric current changing the growth environment of the fungus and the electron transfer reaction between electrodes and P. polonicum.