Version 3
: Received: 12 April 2023 / Approved: 13 April 2023 / Online: 13 April 2023 (03:08:08 CEST)
Version 4
: Received: 12 May 2023 / Approved: 15 May 2023 / Online: 15 May 2023 (03:36:34 CEST)
Shahar, Y.; Rytwo, G. Elementary Steps in Steady State Kinetic Model Approximation for the Homo-Heterogeneous Photocatalysis of Carbamazepine. Clean Technol.2023, 5, 866-880.
Shahar, Y.; Rytwo, G. Elementary Steps in Steady State Kinetic Model Approximation for the Homo-Heterogeneous Photocatalysis of Carbamazepine. Clean Technol. 2023, 5, 866-880.
Shahar, Y.; Rytwo, G. Elementary Steps in Steady State Kinetic Model Approximation for the Homo-Heterogeneous Photocatalysis of Carbamazepine. Clean Technol.2023, 5, 866-880.
Shahar, Y.; Rytwo, G. Elementary Steps in Steady State Kinetic Model Approximation for the Homo-Heterogeneous Photocatalysis of Carbamazepine. Clean Technol. 2023, 5, 866-880.
Abstract
Elucidating physicochemical processes in the degradation of pollutants may optimize their removal from water sources. This work presents a set of elementary steps in the photocatalytic degradation of carbamazepine (CBZ), assuming a steady state approximation in an Advanced Oxidation Process (AOP) combining short-wave ultraviolet radiation (UVC), homogeneous reagent (H2O2) and heterogeneous (TiO2) catalyst. Elementary steps include excitation of both reagent/catalysts by UVC photons, adsorption of CBZ on the excited TiO2, or its oxidation by hydroxyl radicals. Assuming the steady state approximation on the intermediate products (excited TiO2, CBZ- excited TiO2 complex, and hydroxyl radicals), leads to rate laws for degradation of CBZ, in which UVC radiation, TiO2, and H2O2 are pseudo first order at all concentrations or intensities having no direct influence on CBZ pseudo-order, whereas CBZ shifts from pseudo first order at low concentrations to pseudo-zero order at high concentrations. Several experiments to test the mechanism were conducted, by varying CBZ, H2O2, and TiO2 concentrations, and UVC radiation intensities. Measured results indeed fit the suggested mechanism for the first three, but irradiation intensity appears to shift CBZ influence from pseudo-second to pseudo-first order with increased intensities. Corrected elementary steps are proposed to fit the results.
Environmental and Earth Sciences, Water Science and Technology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Received:
15 May 2023
Commenter:
Giora Rytwo
Commenter's Conflict of Interests:
Author
Comment:
During the M.Sc. thesis exam of Mr. Yuval Shahar (first author of the manuscript) one of the examiners (Dr. Yotam Gonen) noticed a few mistakes and misleading definitions in the development of the model. We would like to correct our manuscript accordingly.
Commenter: Giora Rytwo
Commenter's Conflict of Interests: Author