Federal University of Rio de Janeiro BJEDIS, Rio de Janeiro, v. 02 (1), 2022 DOI: https://doi.org/10.55747/bjedis.v2i1.52472 E-ISSN: 2763-6925 Code BJEDIS2022-1#04 UFRJ/BRAZIL Creative Commons Solid-gas adsorption kinetics of the naphthalene on silica and XAD-2. Lisandro von Mulhen 1 , Ronaldo Antunes Funari Junior 1 , Bryan Brummelhaus de Menezes, Lucas Mironuk Frescura 1,2 , Marcelo Barcellos da Rosa 1* . 1 Department of Chemistry, Federal University of Santa Maria, Santa Maria (RS), Brazil. Abstract: Polycyclic aromatics hydrocarbons (PAH) are an important class of pollutants ubiquitous in the environment, being spread from their source to different parts of the world and has already been related to many health issues. Its major font of production is on the burning or pyrolysis of fuels and during asphalt applications. Adsorption process has been used on-air samplers and polluted media remediation and to a better result kinetics information of the process is necessary. A system to monitor the gas  solid mass transfer was developed to represent the presence of PAH on the air. Adsorption of naphthalene in XAD-2 and silica, as separated adsorbents and as mixtures, were studied and a mixture of them in a proportion of 2:1 XAD-2/silica gave the best results in terms of the mass of PAH adsorbed and process kinetics. Improvements on the system developed have to be made for future experiments with PAH with a higher molecular weight. Keywords: PAH, uptake, Adsorption, XAD-2, Silica. Adherence to the BJEDIS’ scope: This work reports the mathematical calculations and modeling applied in the comprehension of the heterogeneous gas-liquid transfer of naphthalene on different adsorbents. * Department of Chemistry, Federal University of Santa Maria, P.O. Box: 97105-900, Santa Maria, Brazil; Tel/Fax: +55-55-3220-8066, E-mail: marcelo.b.rosa@ufsm.br Received 02/10/2022. Revised 03/01/2022. Accepted 03/23/2022. Published 05/16/2022.