[Preparation and Pb2 electrosorption characteristics of MnO2/CFP composite electrode]

The morphological structure and electrochemical properties of the electrode materials have direct impact on the electrosorption results. In this paper, Manganese dioxide ( MnO2) was composed on flexible carbon fiber paper ( CFP) via anodic electrodeposition technique to prepare the MnO2/CFP hybrid electrodes. The electrodes materials prepared showed stable electrochemical property, remarkable electrochemical capacitance, and the specific capacitance reached up to 360 F x g(-1). Electrosorption was conducted with this MnO2/CFP hybrid electrode to treat the waste water with an initial Pb2+ concentration of 6 mg x L(-1), and the effects of deposition time, initial pH, and voltage value on the electrosorption were investigated. It was shown that when the electrodeposition time was 500 s and the application of voltage value was 1.0 V, pH = 5.0, the best electroabsorption result was achieved. After 3 h electrosorption, the residual Pb2+ in the solution was lower than 0.01 mg x L(-1), and the removal efficiency could reach 99%. This study provides a new technology option for the removal of heavy metal ions in low concentrations in the waste water.