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Anne Beatriz Figueira Câmara,Rafael Viana Sales,Carlos Vital dos Santos Júnior,Miguel Angelo Fonseca de Souza,Clenildo de Longe,Thiago Medeiros Chianca,Rosangela Dala Possa,Luiz Carlos Bertolino,Lucie 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.7
Palygorskite clay mineral (Pal) was employed in the removal of Congo red (CR) and methylene blue (MB)dyes pollutants in aqueous effluents by the adsorption process. The materials, Pal raw and acid Pal (Apal), were characterizedby SEM, EDX, XRD, XFR, FTIR, XPS and Raman spectroscopy techniques that evidenced the main active sitesof clay mineral. Characterization data indicated that acid treatment caused a leaching process of metallic cations on thePal surface. As result, the maximum adsorption capacity was increased from 11.3 to 120.5mg·g1 and from 2.7 to238.1mg·g1 for MB and CR dyes, respectively. The regeneration result after five cycles was of 75% recovered to MBadsorption into Apal. Semi-empirical quantum mechanical (SQM) calculations were performed to identify the mechanismof interaction between the Pal surface and dyes. High correlation (R2>0.99) was observed for the experimentaldata using the pseudo-second-order kinetic model, that were confirmed by computed enthalpy values (298.7 to 84.5 kJ·mol1), suggesting a chemisorption process as the determining step. Furthermore, the experimental and computationalresults indicated that the Pal also could work removing efficiently two dyes simultaneously with an adsorptioncapacity of 37.2 and 40.4mg·g1 for MB and CR, respectively.