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  • Title: Catalytic ozonation of phenol using copper coated pumice and zeolite as catalysts.
    Author: Asgari G, Rahmani AR, Barjasteh Askari F, Godini K.
    Journal: J Res Health Sci; 2012 Dec 13; 12(2):93-7. PubMed ID: 23241518.
    Abstract:
    BACKGROUND: Catalytic ozonation has recently been applied as a new method of contaminant removal from water and wastewater. In this study, copper coated pumice and zeolite were used to catalyze the ozonation of phenol as a target pollutant from aqueous solutions. METHODS: The pumice and zeolite stone were modified by CuSO4 (1N). Modified pumice and zeolite were characterized by Adsorption/Desorption Porosimetry (BET) and Scanning Electron Microscope analyses. Ozonation and catalytic ozonation experiments were performed in a 1 L semi-batch reactor containing a prepared phenol solution. The efficiency of catalytic ozonation was investigated by different variables: pH value, contact time, initial phenol concentration, catalyst dose, and radical scavenger. RESULTS: Experimental data indicated that as the pH solution increased, phenol removal increased. pH = 8 was measured as the optimum pH. The removal efficiency in single ozonation process (SOP) was 32% and in the catalytic ozonation process (COP) using modified zeolite and pumice was 51% and 63%, respectively. Moreover, these processes showed a great ability to mineralize phenol (up to 30%). Using the radical scavenger determined the indirect oxidation as the main pathway of phenol removal in both catalytic processes. CONCLUSION: The copper modified zeolite and pumice had good performance to remove phenol through catalytic ozonation method.
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