Cationic surfactant-assisted delamination of disorderly layered clinoptilolites for selective adsorption of CO2 and CH4
Cationic surfactant-assisted delamination of disorderly layered clinoptilolites for selective adsorption of CO2 and CH4
复制标题
阳离子表面活性剂辅助无序层状斜发沸石分层选择性吸附 CO2 和 CH4
DOI：
10.1016/j.jece.2022.108033
复制
发表时间：
2022-06-14
影响因子：
7.7
通讯作者：
Bai, Shiyang
中科院分区：
文献类型：
--
作者：
Jia, Bingying;Xu, Bang;Bai, Shiyang
With the assistance of cetyltrimethyl ammonium bromide (CTAB), the delamination of disorderly layered cli-noptilolite (CP) was performed. The introduction of CTAB in hydrothermal system was beneficial to stratification of CP lamellas by enlarging interlayer spacing, and thus accelerating the formation of disordered CP nanosheets. The hydrophobic alkyl chain restricts the crystal growth along a-axis and the few-layer CP lamellas with inte-grally preserved heulandite structures were obtained by ultrasonic treatment and HNO3 modification at room temperature. Meanwhile, the CTAB-assisted crystallization mechanism was further elucidated, in which, the amorphous spherical nanoparticles were firstly generated and then transformed into the fibrous and lamellar species. Finally, the flower-like CP morphologies with the aggregated nanosheets appeared. Meanwhile, the selective adsorptions and separations of CO2 and CH4 using these delaminated CPs as the absorbents were preliminarily explored, showing a strong potential in the mixed gases separation applications. This approach is a promising strategy for constructing delaminated zeolites with low n(SiO2/Al2O3), which may open a new avenue for the delaminated CP nanosheet applications in gas adsorption and separation fields.
