碱改性活性炭对VOCs的吸附性能  

Adsorption performance of alkali modified activated carbon to VOCs

作　　者：陈益清[1] 高晓洋 伍健威[1] 张向京[3] CHEN Yiqing;GAO Xiaoyang;WU Jianwei;ZHANG Xiangjing(School of Architectural and Environmental Engineering,Shenzhen Polytechnic,Shenzhen 518055,China;Hebei Hong Shun Wang Ji Environmental Technology Co. Ltd.,Shijiazhuang 050031,China;School of Chemical and Pharmaceutical Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China)

机构地区：[1]深圳职业技术学院建筑与环境工程学院,广东深圳518055 [2]河北宏顺旺吉环保科技有限公司,河北石家庄050031 [3]河北科技大学化学与制药工程学院,河北石家庄050018

出　　处：《化工环保》2019年第2期202-207,共6页Environmental Protection of Chemical Industry

基　　金：深圳市科技研发资金项目(JCYJ20150630114140637;JCYJ20160331113033413);河北科技大学科学治霾及大气污染防治重点攻关预研专项(XL-2017-008)

摘　　要：选用3种经氢氧化钠改性的活性炭,研究了其对4种代表性VOCs(丁酮、乙酸乙酯、甲苯和四氯化碳)的吸附规律。结果表明:活性炭经碱改性后吸附性能有较大改善,吸附量的大小与其比表面积呈正相关性,而其比表面积多为微孔提供;改性活性炭对有机气体的吸附以物理吸附为主;吸附质的相对分子质量、密度、熔点与其在改性活性炭上的吸附量具有线性相关性,而沸点、饱和蒸气压、分子动力学直径则与吸附量无明显相关性;对于同一吸附剂,170℃再生时的性能最好,130℃次之,210℃最差。Three kinds of activated carbons modified by sodium hydroxide were used to study their adsorption performances to 4 representative VOCs,such as butanone,ethyl acetate,toluene and carbon tetrachloride. The results showed that:The adsorption performance of alkali modified activated carbon was greatly improved,and there was a positive correlation between the adsorption capacity and the specific surface area of the activated carbon,which was mainly provided by the micropores;The adsorption of organic gases on the modified activated carbon was mainly physical adsorption;The adsorption capacity of the adsorbent had a linear correlation with the molecular weight, density and melting point of the adsorbate,while a poor correlation was presented with the boiling point,saturated vapor pressure and molecular dynamics diameter of the adsorbate;For the same adsorbent,170 ℃ was the suitable regeneration temperature,then 130 ℃,and 210 ℃ gave the unsatisfactory result.

关 键 词：活性炭 改性 吸附 脱附 挥发性有机化合物 

分 类 号：X701[环境科学与工程—环境工程]