摘要
考察了具有不同孔结构的椰壳活性炭对肌酐（CR）的吸附性能,研究了比表面积、孔径分布与肌酐吸附性能的关系,采用准一级、准二级和颗粒内扩散动力学模型对吸附数据拟合处理,确定了模型参数。试验结果表明：1~2.5 nm的微孔对肌酐吸附有利,平均孔径在2.2 nm附近的椰壳活性炭肌酐吸附量为104 mg/g;活性炭对肌酐的吸附能力取决于比表面积,总孔容,微孔率的共同作用。颗粒内扩散吸附并不是唯一的速率控制过程,椰壳活性炭对肌酐的吸附过程更符合准二级动力学模型t/qt=1/k2q2e＋t/qe,相关系数均在0.99以上,表明吸附过程存在化学吸附。
The adsorption behaviors of creatinine（ CR） on coconut-shell activated carbons with different pore structures was investigated,and the relationship between BET surface area / pore size distribution and the adsorption capacity for creatinine was studied. Several kinetic models,such as pseudo-first-order,pseudo-second-order,and intra-particle diffusion kinetic models,were studied on the basis of adsorption data. Results showed that the micropores with pore size of 1- 2. 5 nm were beneficial for adsorption of CR. The adsorption capacity reached 104 mg / g on the coconut-shell activated carbon with average pore size 2. 2 nm.The adsorption capacity of activated carbon for creatinine depended on the combination of the surface area,total pore volume and microporosity. The intraparticle diffusion was not the only rate-determining step. It was found that the adsorption kinetics followed pseudo-second-order kinetic model,which correlation indexes were higher than 0. 99. This suggested that the adsorption of CR on activated carbon was a chemisorption process.
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2015年第3期85-90,共6页
Chemistry and Industry of Forest Products
基金
中国林科院林业新技术所基本科研业务费专项资金(CAFINT2013C02)
关键词
椰壳活性炭
肌酐
吸附
动力学
coconut shell activated carbon
creatinine
adsorption
kinetic
