AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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Authors: ALEXANDRA ANA CSAVDARI.
DOI: 10.24193/subbchem.2023.3.12
Published Online: 2023-09-30
Published Print: 2023-09-30
pp. 179-189
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The present work completes information reported previously on Chrystal violet adsorption from aqueous solutions onto Salvinia natans powder. It identifies intraparticle diffusion as the rate determining step within the sequence of four individual stages of the adsorption mechanism. It also demonstrates, that even is somewhat faster, the film diffusion at the solid-liquid boundary is also slow enough to contribute to the overall process rate. The novel use of a simple kinetic model, consisting of two parallel and competing first-order steps, as well as of an algorithm familiar to pharmacokinetics (the method of residuals), individual rate coefficients of both the film and the intraparticle diffusion were calculated simultaneously from the same kinetic curves. The dependence of their values with employed operating conditions consolidates previous findings and conclusions.
Keywords: Adsorption; Rate determining diffusion; Method of residuals; Competing first-order processes
