New Fe-immobilized natural bentonite plate used as photo-Fenton catalyst for organic pollutant degradation
Novel photo-Fenton catalysts were prepared by immobilizing iron species on commercial bentonite plates via two methods: (1) ion exchange reaction (Fe3+ vs. Na+) by aqueous suspension powder-clay/FeCl3 followed by plate preparation, and (2) forced hydrolysis of Fe(NO3)(3) onto a prefabricated clay plate. The last method led to a more photo-active Fe-oxide/bentonite plate. This material allowed, at a non-adjusted initial pH of 5.5 and in the presence of H2O2, the total degradation of resorcinol and 55% mineralization in 80 and 100 min of irradiation, respectively. The reached degradation percentages were correlated to the presence of dissolved iron, demonstrating that in these processes, the homogeneous photo-Fenton reactions were mainly responsible for the resorcinol elimination.
Keywords: Heterogeneous photo-catalysis ; Fenton-like process ; Wastewater treatment ; Iron-immobilized bentonite ; Iron-Oxide ; Orange-Ii ; Heterogeneous Catalysts ; Aqueous-Solution ; Visible-Light ; Oxidation ; Clay ; Dye ; Adsorption ; Minerals
Record created on 2011-12-16, modified on 2016-08-09