Abstract
The silicalite-1 zeolites with different morphologies (spherical-like, plate-like, and brick-like) were synthesized successfully to study the toluene sorption. The results demonstrate that morphology has a significant and different effect on toluene adsorption under dry or wet conditions. The dynamic adsorption capacities follow S–S (spherical-like silicalite-1) > P–S (plate-like silicalite-1) > B–S (brick-like silicalite-1) under the dry condition (303 K). For the wet condition (RH = 50%, 303 K), the order of the dynamic adsorption capacities is P–S > S–S > B–S. Silicalite-1 zeolites were tested for five adsorption-regeneration cycles to study the reusability and their performance remained stable above 85% after five cycles. The calculated rate constants of Yoon-Nelson model and Weber-Morris (W-M) intra-particle diffusion model reveal that there is less diffusion resistance in P–S. The findings may provide valuable information on zeolite-based adsorbents for adsorption removal or recovery of volatile organic compounds.
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