负载Al_2O_3的活性炭纤维电吸附除盐研究

Research on Al_2O_3-loaded activated carbon fiber for the electro-adsorptive desalination

采用浸渍煅烧法对活性炭纤维进行Al_2O_3负载改性,对改性前后活性炭纤维的微观结构、电化学性能和除盐性能进行分析比较,并探讨了影响其电吸附除盐效果的影响因素,结果表明:改性后活性炭纤维电吸附除盐性能得到极大增强,除盐能力为改性前的2.68倍。且电极具备很好的再生性;其表面出现了絮状和颗粒状的Al_2O_3,比表面积减小,中孔增加,孔径分布更加合理,比电容提高了2.1倍。当电压为2.0 V,极板间距为1 cm,NaCl质量浓度为500 mg/L时,除盐效率可达到64.6%。

Activated carbon fiber has been modified by Al2O3-1oaded dipping calcination method. The micro-structure, electrochemical performance and desalination performance of the activated carbon fiber before and after the modification are analyzed and compared, and the influencing factors that affecting electro-adsorption desalination efficiency are discussed. The results show that the electro-adsorption desalination performance of the modified activated carbon fiber are enhanced greatly. The desalination capability is 2.68 times of that before the modification. In addition, the electrodes have very good reproducibility. Flocculent and granular Al2O3 has appeared on its surfaces, having smaller specific surface and more middle-size mesopores. The pore-size distribution gets more reasonable and specific capacitance has increased by 2.1 times. When the voltage is 2.0 V, the distance between the electrodes is 1 cm and NaCl mass concentration is 500mg/L, the desalination efficiency of the modified activated carbon fiber can reach 64.6%.