水蒸气活化法制备椰壳活性炭的孔结构特征

以农林废弃物椰壳在600℃炭化2h后的炭化料为原料，以水蒸气为活化剂，研究了活化温度、活化时间、水蒸气用量对活性炭的比表面积、微孔容积和收率等的影响。结果表明：椰壳炭化料的比表面积仅为185m^2／g，且以中孔为主。在活化过程中，通过提高活化温度和水蒸气用量缩短了活化时间，扩宽了孔径；当水蒸气用量和活化温度较为适宜时，延长活化时间，有利于微孔的形成。活性炭的比表面积、总孔容积、微孔容积可达：1465m^2／g，0．9703cm^3/g，0．7519cm^2／g。并通过非定域密度函数理论（NLDFT）对活性炭的孔径分布进行了表征。

PREPARATION AND CHARACTERISTICS OF COCONUTSHELLS-BASED ACTIVATED CARBONS PREPAREDBY STEAM ACTIVATION

Activated carbon was prepared from coconut shells by using carbonization at 600℃ for 2h followed by steam activation. The effects of activation temperature and time,and steam content on yield,BET surface area,and micropore volume were systematically studied. The pore structure of the activated＇carbon was characterized by N2 adsorption at 77K. BET Surface area,micropore volume,and pore size distribution （PSD） of the carbons were determined by the BET （Brunauer- Emmett- Teller）, DR （Dubinin- Radushkevich）,and NLDFT（nonlocal density functional theory）methods. The results showed that chass of coconut shell has BET surface area of 185m^2/g with a large number of mesopore activation time may be redueed with the increasing of steam contents and activation temperatures but its micropore is enlarged and yield decreases during aetivation procedure. The BET surface area,total volume and micropore volume of activated carbon are 1465m^2/g,0.9703cm^3/g and 0.7519cm^2/g,respectively.