摘要
以工业活性炭为原料,采用化学活化法以KOH为活化剂进行二次活化改性来提高活性炭的比表面积及吸附性能。研究了KOH用量、活化温度、停留时间等工艺参数对活性炭性能(包括比表面积、收率、亚甲基蓝吸附性能及双电层电容)的影响。实验结果表明,KOH二次活化显著提高了活性炭的BET比表面积,从原来的759 m2/g提高到2 200 m2/g,中孔率达到51.4%,亚甲基蓝的吸附量由245 mg/g提高到566 mg/g。随着热处理温度提高、KOH用量及停留时间的增加,活性炭的收率下降,比表面积增大,亚甲基蓝吸附能力及双电层电容提高。
In the present study on the commercial activated carbons(AC) were modified through chemical activating by potassium hydroxide(KOH) as activating agent to develop large surface area. The effect of preparation condition such as heat treatment temperature, duration, ratio of KOH to AC on BET surface area were investigated. The resultant activated carbons were characterized by BET surface area, yield, adsorption capacity to methylene blue, and double layer capacitance. It was shown that the BET surface area increased from 759 m2/g to 2 200 m2/g after reactivated by KOH, the value of methylene blue adsorption increased from 245 mg/g to 566 mg/g. The double layer capacitance of AC increased with heat temperature, time, and ratio of KOH to AC.
出处
《电源技术》
CAS
CSCD
北大核心
2004年第4期227-230,共4页
Chinese Journal of Power Sources
基金
国家"十五"863项目(2001 AA 501234)
