13.  Photo-Degradation of Pentachlorophenol in the Aqueous Solution

Authors: L.A. Colar, E.C. Ilinoiu, S. Motoc, F. Manea, R. Pode and G. Burtica


Abstract:

The purpose of this study was the photocatalytic degradation of pentachlorophenol (PCP) using a catalyst based on natural zeolite doped with electrocatalytic species (Ag). The photolytic degradation of PCP was studied for comparison and in addition, the adsorption capacity of photocatalyst was assessed. The experiments on photocatalysis and photolysis conducted at two pH values (3 and 6, respectively) revealed that pH has not influenced significantly the overall efficiency of the two processes. Based on the spectral data, the concentration of PCP was assessed and some aspects of the degradation processes were discussed. The apparent rate constants were calculated based on the pseudo-first order model. The kinetics study showed that the PCP degradation by photocatalysis was faster than by photolysis. The UV spectra analysis of the PCP adsorption indicated that no adsorption process occurred.


Keywords: photolysis, photocatalysis, sorption, silver doped zeolite, pentachlorophenol

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