Solution Combustion Synthesis of New Composites Based on Iron Oxide and Mango Waste for Heterogeneous Photocatalysis with UV and Solar Radiation

• Published in: Waste and biomass valorization Vol. 15; no. 9; pp. 5175 - 5190
• Main Authors: de Castro, Lucas Malone Ferreira, Huaman, Noemi Raquel Checca, da Guarda Souza, Marluce Oliveira
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 2024; Springer Nature B.V
• Subjects: Adsorptivity; Catalysts; Combustion; Combustion synthesis; Discoloration; Engineering; Environment; Environmental Engineering/Biotechnology; Hematite; Heterojunctions; Industrial Pollution Prevention; Iron oxides; Magnetic properties; Magnetite; Mangoes; Material properties; Methylene blue; Optical properties; Original Paper; Phase composition; Photocatalysis; Renewable and Green Energy; Solar radiation; Waste Management/Waste Technology; Environmentally friendly; SCS; Iron oxide; Mango residue; Photocatalysis; Solar driven
• ISSN: 1877-2641; 1877-265X
• DOI: 10.1007/s12649-024-02511-6

Materials based on iron oxide were prepared via a closed system solution combustion synthesis (IOP), evaluating the effect of adding mango seed husk (T), peel (C), and a mixture of the portions (M) on the material properties obtained (IOT, IOC, and IOM, respectively). The structural (XRD, Mössbauer), morphological (SEM and TEM), optical (UV-VIS diffuse reflectance), textural (BET), and magnetic (VSM) properties of the materials obtained were evaluated. Different phase compositions (hematite, magnetite, and maghemite) were identified in the structure of the materials. Adding mango residue favored the formation of magnetite with superparamagnetic particles in the IOC sample. The solids were evaluated in the methylene blue photocatalysis at different concentrations, observing different effects on the discoloration rate. The IOP sample performed better at the lowest concentration (50 mg L
−1
) of the dye, with 98% discoloration after 90 min and a specific speed of 44.7 × 10
−3
 min
−1
, which can be explained by the heterojunction effect, making electronic recombination harder and increasing the quantum yield of the photocatalyst. At 70 mg L
−1
concentration, the best catalyst was the IOM with 82% discoloration and a specific speed of 15.8 × 10
−3
 min
−1
, explained by the increase in the specific area due to the insertion of biomass, which improved adsorptive capacity, maintaining the observed heterojunction effects. Under sunlight, the best composite was IOC, with 90.5% discoloration and activity of 29.8 × 10
−3
 min
−1
, justified by combining favorable textural and optical properties.
Graphical Abstract