Publication: A KrCl exciplex flow-through photoreactor for degrading 4-chlorophenol:Experimental and modelling
Authors
M. Gomez ; M.D. Murcia ; J.L. Gomez ; E. Gomez ; M.F. Maximo ; A. Garcia
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Elsevier
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Description
© <2021>. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
This document is the Accepted Manuscript version of a Published Work that appeared in final form in [Applied Catalysis B: Environmental]. To access the final edited and published work see [https://doi.org/10.1016/j.apcatb.2012.01.017].
Abstract
A KrCl exciplex flow-through photoreactor has been used for the removal of 4- chlorophenol. UV/H2O2 and photo-Fenton processes were tested. Considering the degradation of the different compounds, the molar ratio H2O2:4-chlorophenol did not show a significant influence on 4-chlorophenol while an optimum ratio of 25:1 was established for the photoproducts. The presence of the Fenton reagent led to a considerable improvement in the photodegradation of both the substrate and by- products, and an optimum Fe2+ concentration of 5 mg L-1 was determined. Under these conditions, total degradation was attained for a range of substrate concentrations between 50 and 150 mg L-1 and for reaction volumes of 500 mL. A photodegradation mechanism was also proposed, based on the formation of two intermediate compounds that quickly degrade to the primary photoproducts previously identified. A kinetic model was developed and theoretical conversion values of the 4-chlorophenol and the photoproducts were compared with the experimental ones, reaching a high degree of agreement (xcalc = 0.9964 xexp, R2 = 0.9986) and validating the proposed model. This system simulation using relatively high reaction volumes and including the by-products in the kinetic equations represents a first approach with a view to operating in continuous or semi-continuous systems that allow the scaling up of the process.
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