CWPO of 4-CP and industrial wastewater with Al-Fe pillared clays

• Published in: Water science and technology Vol. 61; no. 8; pp. 2161 - 2168
• Main Authors: Molina, C B, Zazo, J A, Casas, J A, Rodriguez, J J
• Format: Journal Article
• Language: English
• Published: England IWA Publishing 01-01-2010
• Subjects: Aluminum Silicates - chemical synthesis; Atmospheric pressure; Bentonite; Carbon; Catalysts; Catalytic activity; Chemical oxygen demand; Chemical synthesis; Chlorophenol; Chlorophenols - chemistry; Clay; Cosmetics; Experiments; Hydrogen peroxide; Industrial Waste; Industrial wastes; Industrial wastewater; Iron; Leaching; Load; Low temperature; Oxidation; Oxidation-Reduction; Stability; Temperature; Waste Disposal, Fluid; Wastewater; Wastewater treatment; Water Pollutants, Chemical - chemistry
• ISSN: 0273-1223; 1996-9732
• DOI: 10.2166/wst.2010.151

Catalysts based on pillared clays with Al-Fe have been synthesised from a commercial bentonite and tested for catalytic wet peroxide oxidation (CWPO) of aqueous 4-Chlorophenol (4-CP) solution and industrial wastewater from cosmetics manufacture. The effect of the synthesis procedure, the iron load and reaction temperature on the catalytic activity was studied using 4-CP as target compound. A lower temperature in the preparation of the pillaring solution, as well as a higher Fe load, gave rise to a higher catalytic activity, but also a higher leaching of the active phase. The best catalyst, in terms of catalytic activity, was also tested for treating cosmetic wastewater by CWPO. Experiments were carried out at 90 degrees C and atmospheric pressure and the influence of Fe load, catalyst concentration and H(2)O(2)/COD ratio (between 0.5 and 2 times the stoichiometric ratio) were analysed. Higher values of these parameters favour COD reduction. The Fe leaching in all cases was lower than 1.2 mg/L, indicating that these catalysts have a high stability under these experimental conditions.