Abstract
Surface modification and bandgap manipulation of ZnTiO3 are proposed to significantly enhance its photocatalytic activity by reducing charge carrier recombination. In this study, we developed a novel ternary photocatalyst by incorporating Pt nanoparticles (Pt NPs), multiwall carbon nanotubes (MWCNT) and ZnTiO3 nanostructures. The synthesis of ZnTiO3 was carried out using the sol-gel methodology, while the Pt@MWCNT/ZnTiO3 photocatalyst was fabricated through ultrasonication and photo-reduction routes. X-ray diffraction (XRD) analysis confirmed the formation of rhombohedral ZnTiO3, and transmission electron microscopy (TEM) examination revealed a well-dispersed arrangement of Pt NPs on the MWCNT/ZnTiO3 nanocomposite. The successful development of the Pt@MWCNT/ZnTiO3 photocatalyst was affirmed through Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and energy-dispersive X-ray spectroscopy (EDS) examinations. A reduction in the bandgap energy was observed with the modification of ZnTiO3 to the ternary Pt@MWCNT/ZnTiO3. The newly developed Pt@MWCNT/ZnTiO3 photocatalyst demonstrated exceptional effectiveness, achieving a remarkable 92.62 % removal of the insecticide derivative thiamethoxam (TXM) in just 40 min under visible light. This represents 2.12 times greater efficiency than pure ZnTiO3. Moreover, the Pt@MWCNT/ZnTiO3 nanostructure exhibited remarkable efficacy in the degradation of methylene blue (MB) dye, eliminating its complex structure in just 12 min, with excellent reusability. The outstanding photodegradation capabilities of Pt@MWCNT/ZnTiO3 can be attributed to the presence of highly ordered mesoporous ZnTiO3, an increase in surface area, a favorable bandgap, and improved visible light absorption. Additionally, this Pt@MWCNT/ZnTiO3 photocatalyst demonstrated effective mitigation of charge carrier recombination. The highly efficient nature of the developed ternary Pt@MWCNT/ZnTiO3 photocatalyst holds substantial promise for widespread applications in environmental remediation activities.
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