A Revised Pseudo-Second-Order Kinetic Model for Adsorption, Sensitive to Changes in Adsorbate and Adsorbent Concentrations
| Autor: | Sarawud Saleesongsom, Jay C. Bullen, Dominik J. Weiss, Kerry Gallagher |
|---|---|
| Přispěvatelé: | Imperial College London, Géosciences Rennes (GR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS), UK Research & Innovation (UKRI)Engineering Physical Sciences Research Council (EPSRC) [grant number EP/N509486/1]., Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES), Engineering & Physical Science Research Council (E |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Technology
Materials science Chemistry Multidisciplinary Materials Science Kinetics Thermodynamics Inverse Materials Science Multidisciplinary 02 engineering and technology 010402 general chemistry Kinetic energy 01 natural sciences Reaction rate Adsorption Reaction rate constant Residual sum of squares [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Electrochemistry General Materials Science Spectroscopy Science & Technology Chemical Physics Chemistry Physical Surfaces and Interfaces Rate equation 021001 nanoscience & nanotechnology Condensed Matter Physics 6. Clean water 0104 chemical sciences Chemistry Physical Sciences 0210 nano-technology |
| Zdroj: | Langmuir Langmuir, 2021, 37 (10), pp.3189-3201. ⟨10.1021/acs.langmuir.1c00142⟩ Langmuir, American Chemical Society, 2021, 37 (10), pp.3189-3201. ⟨10.1021/acs.langmuir.1c00142⟩ |
| ISSN: | 0743-7463 1520-5827 |
| Popis: | The development of new adsorbent materials for the removal of toxic contaminants from drinking water is crucial toward achieving the United Nations Sustainable Development Goal 6 (clean water and sanitation). The characterization of these materials includes fitting models of adsorption kinetics to experimental data, most commonly the pseudo-second-order (PSO) model. The PSO model, however, is not sensitive to parameters such as adsorbate and adsorbent concentrations (C0 and Cs) and consequently is not able to predict changes in performance as a function of operating conditions. Furthermore, the experimental conditionality of the PSO rate constant, k2, can lead to erroneous conclusions when comparing literature results. In this study, we analyze 103 kinetic experiments from 47 literature sources to develop a relatively simple modification of the PSO rate equation, yielding d q t d t = k ' C t ( 1 - q t q e ) 2 . Unlike the original PSO model, this revised rate equation (rPSO) provides the first-order and zero-order dependencies upon C0 and Cs that we observe empirically. Our new model reduces the residual sum of squares by 66% when using a single rate constant to model multiple adsorption experiments with varying initial conditions. Furthermore, we demonstrate how the rPSO rate constant k' is more appropriate for comparing literature studies, highlighting faster kinetics in the adsorption of arsenic onto alumina versus iron oxides. This revised rate equation should find applications in engineering studies, especially since the rPSO rate constant k' does not show a counter-intuitive inverse relationship with increasing reaction rates when C0 is increased, unlike the PSO rate constant k2. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|