Photothermal Degradation of Pollutants Using a Ag@ZnNP/TiO₂ Composite

Area of Science:

• Environmental Chemistry
• Materials Science
• Nanotechnology

Background:

• Persistent pollutants like PFAS and pesticides pose significant wastewater treatment challenges.
• Developing sustainable and efficient degradation strategies is crucial for environmental protection.

Purpose of the Study:

• To synthesize and evaluate silver-zinc core-shell nanostructures (Ag@ZnNP) dispersed on TiO2 as photothermal materials.
• To investigate the degradation efficiency of Ag@ZnNP/TiO2 for perfluorooctanoic acid (PFOA) and fipronil.

Main Methods:

• Ag@ZnNP synthesized using pulsed laser ablation in liquid.
• Characterization via X-ray diffraction and atomic emission spectroscopy.
• Photothermal degradation experiments under blue light irradiation.

Main Results:

• Ag@ZnNP/TiO2 achieved 85% PFOA degradation in 7 hours via photothermal sulfate radical formation.
• Ag@ZnNP/TiO2 demonstrated 88% fipronil removal within 1 hour under blue light.
• Synthesized materials showed comparable photothermal properties to pure silver nanoparticles with reduced silver content.

Conclusions:

• Ag@ZnNP/TiO2 is a promising photothermal material for degrading persistent environmental contaminants.
• This approach offers an efficient and lower-silver alternative for wastewater treatment.
• The study highlights the potential of tailored nanostructures for environmental remediation.