Heterogeneous photo-Fenton using sustainable catalysts for the decolorization of red dye 6

• Published in: International journal of environmental science and technology (Tehran) 2024-08, Vol.21 (12), p.7881-7896
• Main Authors: Pinedo-Hernández, S., Diaz-Nava, M. C.
• Format: Article
• Language: English
• Subjects: Aquatic Pollution; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Science and Engineering; Original Paper; Soil Science & Conservation; Waste Water Technology; Water Management; Water Pollution Control
• ISSN: 1735-1472; 1735-2630
• DOI: 10.1007/s13762-024-05542-7

The results obtained indicate that the catalysts synthesized: They were alginate-ferric clay and alginate-Fe, both were obtained by the casting method and their ability to decolorize the red dye 6 was evaluated. The materials were characterized by scanning electron microscopy (SEM) and elemental analysis by energy dispersive X-ray spectroscopy (EDS), Fourier-transform infrared spectroscopy (FTIR) and a bioassay on Elongation of Lactuca sativa root was performed to verify the toxicity of the dye. In order to observer the effect that the availability of iron has on the efficiency of the process the Fe-alginate was compared with iron clay (iron-conditioned bentonite). The results indicate that the alginate film with iron clay presents a higher efficiency under UV light, with a discoloration percentage of 79%. On the other hand, under solar radiation, the alginate film with Fe showed a higher percentage of discoloration than 98%. The adsorption kinetics of the materials are best described by a first-order reaction, which provides important information about the behavior of the catalyst during the degradation process. Toxicity tests indicate that Lactuca sativa root growth is affected by iron residues and hydrogen peroxide in aqueous solutions. Graphical abstract Toxicity Bioassay Diagram