【摘要】 采用物理化学活化法处理干熄兰炭进一步制备活性炭,探究了活化剂选择、碱炭比、活化温度、活化时间对活性炭吸附维生素B₁₂溶液的影响,并且对最优条件下制备的活性炭进行SEM、BET、FIIR分析。研究表明,对比不同活化剂（ZnCl₂、H₃PO₄、KOH）饱和溶液浸渍后得到的活性炭吸附维生素B₁₂吸附量,KOH活化制备活性炭的吸附量远大于ZnCl₂和H₃PO₄,当采用饱和KOH溶液浸渍,m（碱）∶m（炭）=3∶1、活化温度为880℃、活化时间为110 min时制备的活性炭对维生素B₁₂溶液的吸附量最大,可达57.5 mg/g,其BET比表面积为1 157.2 m²/g。经扫描电镜和孔径分布分析其微孔和中孔最为丰富,通过红外光谱可知最优条件下制备的活性炭的表面有—OH、CO、—COOH、C—H等基团,可为榆林干熄兰炭作为吸附材料的利用提供新的思路。更多还原

【Abstract】 The activated carbon was prepared from dry quenching semi-coke by using the physical and chemical activation treatment.The effects of activator selection, alkali-carbon ratio, activation temperature and activation time on the adsorption of vitamin B₁₂ solution by activated carbon were investigated, and the activated carbon prepared under optimal conditions was analysed by SEM,BET,FIIR.The results showed that the amount of vitamin B₁₂ adsorbed on activated carbon prepared from saturated solution of different activators（ZnCl₂,H₃PO₄,KOH） was higher than that of ZnCl₂ and H₃PO₄ by KOH activation.When saturated KOH solution was used for impregnation, m（alkali）∶m（carbon）=3∶1,activation temperature was 880 ℃,and activation time was 110 min, the maximum adsorption capacity of activated carbon for vitamin B₁₂ solution was 57.5 mg/g, and its BET specific surface area was 1 157.2 m²/g.The micropores and mesopores were the most abundant according to SEM and pore size distribution.The infrared spectra showed that the surface of the activated carbon prepared under the optimal conditions were: —OH,C-O,—COOH,C—H and other groups.This study can provide a new idea for the use of dry quenching semi-coke as adsorption material in Yulin.更多还原