摘要：

用KOH对市售的粉末活性炭进行表面改性。采用BET分析改性前后活性炭的表面结构,并采用活性炭涂层电极构建电容去离子吸附装置,研究改性后电极的去离子效果。研究表明:经过KOH改性后,活性炭的比表面积从519.25 m²/g增加到975.07 m²/g,提高了87.78%,中孔孔容占总孔孔容的百分比提高了48.28%,改性后活性炭的孔隙结构和孔径的分布更有利于溶液中的Na⁺和Cl^-通过,提高了电极的吸附速率。

关键词: 活性炭, 表面改性, 电容去离子

Abstract:

The surface modification has been made to the commercial activated carbon powder with KOH. The surface structure of activated carbon,before and after the modification are analyzed with BET. The capacitive deionization adsorption device is established with activated carbon-coated electrodes. The deionization effect of the modified electrode is researched. The research shows that after being modified with KOH,the specific surface area of activated carbons is increased from 519.25 m²/g to 975.07 m²/g;it means that its increase in percentage is 87.78%. The percentage of medium-size pore volume is 48.28% higher than the total pore volume. The pore structure and pore-size distribution are more advantageous for Na⁺ and Cl^- to get through,raising the electrode adsorption rate.

Key words: activated carbon, surface modified, electrosorptive deionization

中图分类号: 

• X703.1