Low cost effective heterogeneous photo‐Fenton catalyst from drinking water treatment residuals for reactive blue 19 degradation: Preparation and characterization
Salima Laib, Hynda Rezzaz‐Yazid, H. Cengiz Yatmaz, Zahra Sadaoui
Abstract
Abstract Four different catalysts from drinking water treatment residuals (DWTR) were prepared via impregnation in the iron nitrate, calcined at different temperatures ranged from 200°C to 500°C, and tested for the reactive blue 19 oxidation using the heterogeneous photo‐Fenton, under UVA light source. XRD and XPS results revealed that iron nature was found under a ferric oxide form (Fe 3+ ) similar to the magnetite. Calcination temperature results showed a significant effect on the activity of the catalysts. RB19 and TOC removals were 99% and 79%, respectively, with the best catalyst that calcined at 500°C in optimal conditions as follows: initial pH solution = 3, 10 mM of H 2 O 2 dosage, 0.5 g/L of catalyst loading, reaction temperature 35°C, and I UVA = 3.55 MW/cm 2 for 50 mg/L of RB19. The reusability of the catalyst after three cycles showed complete removal of RB19 and 65% TOC removal. Practitioner points Synthetized heterogeneous photo‐Fenton catalyst from drinking water treatment residuals for the photo Fenton oxidation. The calcination temperatures plays a crucial role in catalyst photocatalytic activity. Degradation of reactive blue 19 with Fe/DWTR‐500 in presence of H 2 O 2 . The Fe/DWTR‐500 catalyst exhibited the best photocatalytic activity. Reusability studies of Fe/DWTR‐500 and the kinetics of reactive blue 19 degradation were investigated.