活性炭纤维电极电吸附除盐机理研究

Study for the Desalination Mechanism of the Activated Carbon Fiber Electrodes by Electric Adsorption

采用自制电吸附除盐装置,在不同操作电压、不同进水浓度条件下,对一定体积的氯化钠溶液进行循环处理,通过吸附过程中的吸附等温线和动力学方程探究了活性炭纤维电极电吸附除盐机理。结果表明:活性炭纤维电极电吸附过程符合Freundlich吸附等温线,电压越大,电极吸附能力越强;而Lagergren准二级动力学方程拟合结果表明,电压越大,极板吸附速率越快;Weber-Morris方程表明,内扩散是影响电吸附速率的主要因素。

The desalination device of electric adsorption was made by self. Under the different conditions of operating voltage and inflow Na Cl concentration,a certain volume Na Cl solution was circulated by using desalination device. The desalination mechanism of the activated carbon fiber electrodes by electric adsorption was researched by studying the adsorption isotherm and kinetic equation of electric adsorption process. The results show that the desalination process of the activated carbon fiber electrodes by electric adsorption conforms with Freundlich adsorption isotherm. With the increase of voltage,the adsorption capacity also increases. Lagergren pseudo-second order kinetics equation shows that the higher the voltage,the greater the rate of adsorption. Weber-Morris equation shows that the major affecting factor of electric adsorption rate is internal diffusion.