(278f) The Direct Synthesis of Functional Zeolite Nanosheets and Their Applications for Congo Red Removal

Zeolites are among the most mature adsorbents and catalysts. The uniform pore sizes defined the crystalline structure are advantageous for achieving molecular sieving effects for enhanced performance. The recent advances on zeolite nanosheets create new opportunities for applications previously limited by the slow diffusion to reach the intracrystalline active sites. Better catalytic and adsorption properties have been demonstrated for various applications by zeolite nanosheets comparing to conventional zeolites. Zeolite nanosheets are commonly used in their activated forms, i.e. with organics removed by oxidation. The vast external surface area of zeolite nanosheets also makes them attractive materials for functionalization by post-synthesis treatment. The multiple-step materials preparation inevitably increases the production cost of functionalized zeolite nanosheets. In this work, we will demonstrate the direct synthesis of 2D zeolite with large amount of external organic functional groups. The influence of synthesis conditions on zeolite morphology and adsorption properties will be discussed. The applicability of the 2D zeolites as adsorbents will be demonstrated by Congo red adsorption in aqueous phase. The adsorption isotherm and uptake rate will be compared with conventional zeolite and the calcined samples. This work will showcase the direct synthesis of functional zeolite nanosheets and their superior adsorption properties comparing to conventional zeolites.