摘要
用硝酸对活性炭进行改性,对改性前后活性炭的性质进行了表征,并考察了改性前后活性炭对模拟汽油中苯并噻吩的吸附平衡及动力学行为。采用Freundlich、Langmuir、Sips和BET吸附模型分别对改性前后活性炭吸附苯并噻吩的吸附平衡数据进行拟合,用准一阶、准二阶、混阶和修正的准n阶速率方程对其动力学数据进行拟合。结果表明,BET和Sips吸附模型对改性前活性炭吸附苯并噻吩的吸附等温线拟合度最高,Sips和Freundlich吸附模型对改性后的拟合度最高;改性前后活性炭对苯并噻吩的吸附均以物理吸附为主,改性后活性炭表面活性位的异质化程度增加,对苯并噻吩的亲和力增强。修正的准n阶速率方程对活性炭吸附苯并噻吩动力学的拟合度最高。活性炭表面含氧官能团的密度是决定其吸附容量的主要因素,改性后活性炭对苯并噻吩的吸附容量提高33.7%。
Activated carbon was modified with nitric acid.The properties of activated carbon before and after modification were characterized.The adsorption equilibrium and kinetics of benzothiophene on the original activated carbon and its modified form were studied,in which the adsorption equilibrium data were fitted with Freundlich,Langmuir,Sips and BET adsorption models and the kinetic data were fitted with pseudo-first-order,pseudo-second-order,mixed-order and modified pseudo-n-order rate equations.The results showed that BET and Sips models fitted best to the adsorption equilibrium of benzothiophene on the original activated carbon,Sips and Freundlich models fitted best to the kinetics of benzothiophene on the modified activated carbon.The adsorption of benzothiophene on activated carbon before and after modification was mainly physical,and the degree of heterogeneity of the surface and the affinity with benzothiophene for the modified activated carbon were enhanced,resulting in 33.7% increase of absorption capacity.The density of oxygen containing functional groups on the surface of activated carbon was the main factor to determine the adsorption capacity.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2014年第1期47-52,共6页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
国家自然科学基金项目(21076126)
辽宁省高等学校优秀人才支持计划项目(LR2012013)资助
关键词
活性炭
硝酸改性
苯并噻吩
吸附平衡
动力学
activated carbon
nitric acid modification
benzothiophene
adsorption equilibrium
kinetics
作者简介
张志刚,男,教授,博士,从事传质与分离方面的研究.
通讯联系人：李文秀，男，教授，博士，从事化工传质与分离方面的研究；Tel：024—89388215；E—mail：wenxli@126．com
