Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 28, Issue 11, Pages 14018-14027Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-020-11664-5
Keywords
Iron oxides; Titanium dioxide; Alginate; Photodegradation; Visible response; Biopolymer
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Funding
- MAScIR (Moroccan Foundation for Advanced Science, Innovation and Research)
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Utilizing Fe2O3-modified TiO2-Alg beads, the study successfully overcame the limitations of titanium oxide, showing enhanced visible light responsiveness and good cycling performance.
To overcome the titanium oxide limitations, Fe2O3- and Fe3O4-modified TiO2 (3:1) nanoparticles were synthesized by a humid and solid path, respectively. These nanoparticles were embedded in sodium alginate biopolymer to prepare beads with efficient adsorption and photocatalytic behaviors in cationic dye degradation under both UV and visible irradiations. Operating conditions were investigated such as initial methylene blue (MB) concentration and contact time to evaluate their impact on the process. The bead recycling was also scrutinized. We have come to the conclusion that Fe2O3-modified TiO2-Alg displayed superiorities, including expanded responsive wavelength range in the visible region (up to 700 nm), narrower band gap (1.79 eV), and better efficiency for MB removal in terms of adsorption capacities and photocatalytic effectiveness under both UV and visible irradiations. Furthermore, these beads can be effortlessly recovered from the reaction medium after the photocatalytic process and reused up to 5 cycles without any noteworthy decline in their initial properties.
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