Speaker
Description
The escalating environmental challenges associated with persistent organic pollutants in aquatic systems necessitate the development of innovative purification strategies. Materials that combine adsorption and photocatalysis are particularly attractive, as they enable both the pre-concentration of contaminants on the surface and their subsequent degradation under light irradiation. In this study, a composite SiO₂/SrTiO₃@Al modified with Rh/Cr₂O₃ and CoOOH co-catalysts was synthesized. Mesoporous SiO₂, prepared via the sol–gel method, provided a high surface area and adsorption capacity, while Al-doping of SrTiO₃ combined with co-catalyst deposition enhanced photocatalytic activity by extending light absorption up to 400 nm and facilitating efficient charge separation.
Composites obtained by sol–gel and hydrothermal approaches exhibited distinct mechanisms: SG samples demonstrated superior adsorption (up to 96% removal at pH 8–10), whereas HT composites showed higher photocatalytic efficiency (98% at pH 6). In real water matrices (tap and Sorbulak reservoir wastewater), the HT composites maintained efficiencies above 90% with excellent reusability. These findings highlight the synergistic effect of adsorption and photocatalysis in SiO₂/SrTiO₃@Al composites and underline their potential as robust materials for sustainable wastewater treatment.
KEYWORDS: synergistic effect; synthesis; photocatalysis; adsorption
