摘要
为提高分子筛在含水条件下对VOCs的吸附性能,采用表面修饰方法选取三甲基氯硅烷(TMCS)、甲基三甲氧基硅烷(MTMS)、六甲基二硅胺烷(HMDS)等3种不同硅烷试剂对强亲水性的商业Na Y分子筛进行改性,对比测试了在干燥和较高湿度条件下样品对甲苯的动态吸附性能。样品表征结果表明,硅烷化改性后分子筛骨架结构未发生明显改变,表面积和孔径均有所减小。采用上述3种试剂改性后,样品的静态水接触角从0依次增加为69.2°、45.2°和19.0°,憎水性明显提高。在甲苯初始浓度为4 500 mg·m^(-3),相对湿度为80%的固定床实验条件下,改性分子筛对甲苯的吸附量分别增加了78%、73%和34%。
To improve the hydrophobicity of zeolite for better adsorption of volatile organic compounds （VOCs）,three silane reagents,trimethylchlorosilane （TMCS）,methyltrimethoxysilane （MTMS）,and hexamethyldisilazane （HMDS）,were used to modify hydrophilic Na Y molecular sieve by organosilylation.The dynamic adsorption experiments of toluene under dry and wet conditions were carried out in a home-made packed bed.The structural properties of the samples before and after modification were characterized by N_2 adsorption-desorption isotherms,XRD,and FT-IR.The results showed that the crystal structures were largely maintained,but the surface area and the pore size of these zeolites were decreased after modification.For Na Y molecular sieve modified by TMCS,MTMS and HMDS,the static water contact angle of these samples increased from 0 to 69.2°,45.2°,and 19.0°,respectively,indicating obvious improvement in hydrophobicity.At a high relative humidity of 80%,for 4 500 mg·m^-3 toluene gas,the adsorption capacities of these samples were enhanced by 78%,73% and 34%,respectively.
作者
张媛媛
王笠力
何丽
吴波
程琰
ZHANG Yuanyuan WANG Lili HE Li WU Bo CHENG Yan(College of Earth Science and Environmental Engineering, Southwest Jiaotong University, Chengdu 610036, China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2017年第10期5509-5514,共6页
Chinese Journal of Environmental Engineering
基金
成都市科技局科技慧民技术研发项目(2015-HM01-00394-SF)
关键词
NA
Y
甲苯
疏水性
硅烷化
吸附
Na Y
toluene
hydrophobicity
silylation
adsorption
