13X@SiO2: Synthesis and Toluene Adsorption

In practice, adsorbents such as 13X have strong hydrophilicity due to their low Si/Al ratio, whose competitive adsorption between vapour and volatile organic compounds（VOCs）often impairs the actual removal effect of VOCs on the adsorbents. Here, 13X was modified using CTABr as a templating agent and tetraethoxysilane（TEOS）as a silica source.Based on this modified 13X, a core-shell composites with 13X core and a mesoporous silica shell, named as 13X@SiO2, was therefore synthesized. Its adsorption performance was tested by using toluene as a probe molecule under different humidity conditions on a penetration experimental device, compared with that of the pristine 13X. The results show that the adsorption capacity of sample 13X@SiO 2-2.6（2.6 mL TEOS added in the preparation）was about 18% higher than that of 13X original sample under dry conditions. At 30% and 50% relative humidity, the optimum adsorption capacity of 13X@SiO2 was increased by about 53% and 90%, respectively. In order to test the stability and reu