Removal of aqueous Clopyralid by Photoctalytic-ozonation process on Activated carbon under solar radiation: Catalyst characterization and kinetic study

• Main Authors: Rajah, Zouhour, Guiza, Monia, Javier Rivas Toledo, Francisco, Ouederni, Abdelmottaleb
• Format: Conference Proceeding
• Language: English
• Subjects: Activated carbon; Adsorption; Aqueous solutions; Carbon; Catalysts; Daylight; Herbicides; Mineralization; Ozonation; Reaction kinetics; Scanning electron microscopy; Solar radiation
• ISSN: 2267-1242; 2555-0403; 2267-1242
• DOI: 10.1051/e3sconf/20199502005

Solar photocatalytic ozonation has been used to oxidize the herbicide clopyralid in aqueous solution. Activated carbon used as a catalyst was characterized by Scanning Electron Microscopy (SEM) images showed the presence of irregular cavities and pores, which have different sizes and shapes, with a great surface area of BETand a high pHpzc. The adsorption kinetics was found to follow the pseudo-second-order kinetic mode. Catalyst stability was tested by means of consecutive reuse cycles. After five cycle of reuse the adsorption efficiency reached 75% of the clopyralid removal.Clopyralid elimination kinetic by direct ozonation has been studies. The system O 3 /AC/Daylight significantly improves clopyralid and mineralization rate abatement if compared to runs conducted in the absence of radiation and/ or activated carbon. Clopyralid total abatement was achieved in less than 30 min when 0.5 g/L of activated carbon and under solar radiation (300-800 nm) were used. Thus, TOC removal in 180 min treatments increased from 20 to about 90 % in O 3 and O 3 /OSAC/Daylight, respectively, under similar operating conditions.