MnO2/CFP复合电极的制备及电吸附Pb2+特性的研究

电极材料的形貌结构与电化学性能等将直接影响着电吸附效果.本研究将二氧化锰(Mn O2)通过电沉积的方法负载于碳纤维纸(CFP)材料上,制备获得了Mn O2/CFP复合电极.所制得的Mn O2/CFP复合电极电化学性质稳定、电容量高,复合电极的单位质量比电容量可高达360 F·g-1.用此电极对初始浓度为6 mg·L-1左右的Pb2+溶液进行电吸附,考察了电沉积时间、电压、p H值等因素对复合电极电吸附效果的影响.结果表明,沉积时间为500 s、电压值为1.0 V、p H值为5.0的条件下可获得最佳的电吸附效果,电吸附3 h后原溶液中残留Pb2+达到0.01 mg·L-1以下,去除效率高达99%以上.本研究为水中重金属离子的去除提供了新的技术选择.

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·g^-1. Electrosorption was conducted with this MnO₂/CFP hybrid electrode to treat the waste water with an initial Pb²⁺ concentration of 6 mg·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·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.