MnO_2/CFP复合电极的制备及电吸附Pb^(2+)特性的研究

Preparation and Pb^(2+) Electrosorption Characteristics of MnO_2/CFP Composite Electrode

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.

The morphological structure and electrochemical properties of the electrode materials have direct impact on the electrosorption results. In this paper,Manganese dioxide( Mn O2) was composed on flexible carbon fiber paper( CFP) via anodic electrodeposition technique to prepare the Mn O2/ 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 Mn O2/ CFP hybrid electrode to treat the waste water with an initial Pb2 +concentration of 6mg·L- 1,and the effects of deposition time,initial p H,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,p H = 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.