Abstract
In the current study, Fe3O4/aluminum fumarate (AlFu) magnetic nanocomposite has been synthesized through the sol-gel procedure to be used as a novel support for CdS nanorods in photocatalytic degradation of Congo red (CR) and crystal violet (CV) dyes in aqueous media under visible light irradiation, separately. The CdS nanorods were solvothermally decorated on magnetic AlFu. The physicochemical properties of the synthesized samples were examined by multiple techniques. In comparison to pure CdS, the photocatalytic performance of magnetical separable Cd/magnetic AlFu is striking. This could be attributed to improving the recombination rate, charge transfer resistance, and adsorption site, which are figured out through characterization data. Removal of contaminants has been statistically optimized and modeled based on operational parameters, including catalyst dosage, initial dye concentration, and pH. At optimum conditions, the removal of CR and CV dyes was 99.5 % and 86.17 %, respectively. Moreover, the photocatalyst exhibited satisfactory performance in TOC removal and remarkable stability during six successive cyclic operations. At several dye concentrations, kinetic experiments have been undertaken, and results revealed that the photo-degradation reaction of CR and CV corresponds well with the Langmuir-Hinshelwood model. Furthermore, the Z-scheme mechanism was suggested based on characterization data and quenching experiments, which revealed that •O2- plus h+ in CR photo-degradation, and •O2- plus •OH in CV photo-degradation play pivotal roles.
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