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Core-shell based nanostructures are attractive candidates for photocatalysis owing to their tunable physicochemical properties, their interfacial contact effects, and their efficacy in charge-carrier separation. This study reports, for the first time, on the synthesis of mesoporous silica@nickel phyllosilicate/titania (mSiO 2 @NiPS/TiO 2 ) core-shell nanostructures. The TEM results showed that the mSiO 2 @NiPS composite has a core-shell nanostructure with a unique flake-like shell morphology. XPS analysis revealed the successful formation of 1:1 nickel phyllosilicate on the SiO 2 surface. The addition of TiO 2 to the mSiO 2 @NiPS yielded the mSiO 2 @NiPS/TiO 2 composite. The bandgap energy of mSiO 2 @NiPS and of mSiO 2 @NiPS/TiO 2 were estimated to be 2.05 and 2.68 eV, respectively, indicating the role of titania in tuning the optoelectronic properties of the SiO 2 @nickel phyllosilicate. As a proof of concept, the core-shell nanostructures were used as photocatalysts for the degradation of methyl violet dye and the degradation efficiencies were found to be 72% and 99% for the mSiO 2 @NiPS and the mSiO 2 @NiPS/TiO 2 nanostructures, respectively. Furthermore, a recyclability test revealed good stability and recyclability of the mSiO 2 @NiPS/TiO 2 photocatalyst with a degradation efficacy of 93% after three cycles. The porous flake-like morphology of the nickel phyllosilicate acted as a suitable support for the TiO 2 nanoparticles. Further, a coating of TiO 2 on the mSiO 2 @NiPS surface greatly affected the surface features and optoelectronic properties of the core-shell nanostructure and yielded superior photocatalytic properties.

beilstein journal of nanotechnology

Unravelling the interfacial interaction in mesoporous SiO<sub>2</sub>@nickel phyllosilicate/TiO<sub>2</sub> core–shell nanostructures for photocatalytic activity

Unravelling the interfacial interaction in mesoporous SiO2@nickel phyllosilicate/TiO2 core–shell nanostructures for photocatalytic activity

Unravelling the interfacial interaction in mesoporous SiO₂@nickel phyllosilicate/TiO₂ core–shell nanostructures for photocatalytic activity