Sr and Al co-doped nanocrystalline spinel MgFe2O4 for enhanced photocatalytic removal of toxic compounds from industrial wastewater
2025
Imran Shakir | Shumaila Sattar | Norah Salem Alsaiari | Ibrahim A. Alsafari | Beriham Basha | Imed Boukhris | M.S. Al-Buriahi | Muhammad Imran Din | Muhammad Farooq Warsi
Spinel ferrites have attracted significant attention in advanced technological devices fabrication, in environmental contaminants degradation, in medical diagnosis, and as therapeutic agents. A comprehensive study was conducted to investigate the potential of magnesium ferrite (MgFe2O4, MF) and its doped variants including strontium doped magnesium ferrite (Sr0.05Mg0.95Fe2O4, SMF), aluminum doped magnesium ferrite (Al0.05MgFe1.95O4, AMF), and strontium and aluminum co-doped magnesium ferrite (Sr0.05Al0.05Mg0.95Fe1.95O4, SAMF) for the degradation of harmful industrial effluents. The fabrication of all magnesium ferrite based nanoparticles was carried out via wet chemical strategy i.e. co-precipitation. The synthesized samples were characterized using different techniques. For the photocatalytic study, crystal violet (CV) and Congo red (CR) were used as model organic contaminants. The photocatalytic experiments showed highest degradation by Sr0.05Mg0.95Fe2O4 (SMF) about 76 % and 91 % for CV and CR under Xenon lamp illumination of 90 min. The present study revealed that Sr doping create oxygen vacancies in spinel ferrites that enhance photocatalytic activity by facilitating charge separation while Al doping interact with these vacancies, potentially reducing their concentration or altering their distribution. This interaction may negate the beneficial effects of Sr-induced vacancies in case of co-doped sample i.e. SAMF. Hence, Sr doped spinel ferrites are potential materials for wastewater treatment.
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