摘要
采用石油焦为原料,以KOH为活化剂,制得高比表面积活性炭,比表面和孔容远高于常规活性炭,孔径分布和常规活性炭相似。以高比表面积活性炭作为电吸附电极,考察其在NaCl溶液中的电吸附性能,并对活性炭电极电吸附的影响因素进行研究。结果表明,活性炭电极的电吸附性能主要受比表面积和孔容的影响,高比表面积和大孔容的活性炭单位电吸附量高。由于电场重叠效应,部分孔没有起到电吸附作用,降低了微孔的电吸附容量。而当孔径超过一定值后,主要是微孔对电吸附起作用。随着流速的增加,电吸附量降低,物理吸附对电吸附影响不大。
Activated carbons with high surface areas were made from petroleum coke using KOH activation. The specific surface and pore volume of high specific surface activated carbon were higher than those of common activated carbons. The pore diameter of high specific surface activated carbon was similar to that of common activated carbon. The electrosorption performance of high specific surface activated carbon as electrode in NaC1 solution was investigated and effecting factors to electrosorption were studied. The results showed that electrosorption performance was affected by specific surface and pore volume, and the higher surface area and the larger pore volume led to the higher absorption capacity. Partial pore didn＇t contribute to electrosorption due to the overlapping field, which decreased microporous absorption capacity. When pore diameter was more than specific value, effective contribution to electrosorption was mainly from micropores. With increasing flow rate, absorption capacity decreased. Moreover the physical absorption didn＇t affect absorption capacity.
出处
《炭素技术》
CAS
CSCD
2011年第6期1-4,共4页
Carbon Techniques
基金
国家自然科学基金(50602003
50502004)
北京市科技新星计划(2007B020)
关键词
高比表面积活性炭
电吸附
脱盐
High specific surface activated carbon
electrosorption
capacitive deionization
