Hierarchically structured TiO₂-based composites for Fenton-type oxidation processes.

Area of Science:

• Materials Science
• Environmental Chemistry
• Catalysis

Background:

• Developing stable and efficient catalysts is crucial for advanced oxidation processes in wastewater treatment.
• Heterogeneous Fenton-type (HFT) oxidation offers a promising route for degrading persistent organic pollutants.

Purpose of the Study:

• To synthesize and characterize a novel hierarchically structured composite catalyst for HFT oxidation.
• To evaluate the catalytic performance of the composite for the degradation of Orange G dye.
• To assess the stability and reusability of the developed catalyst.

Main Methods:

• A cost-effective method involving Prussian Blue nanoparticle (PBNP) dispersion onto macroporous TiO2 (rutile) monoliths via directional freezing.
• Catalytic performance evaluation in a batch-recycle reactor using Orange G as a model pollutant.
• Characterization of the catalyst using various analytical techniques before and after reaction.

Main Results:

• The PBNP/TiO2 composite catalyst effectively decomposed hydrogen peroxide to generate oxidative radicals for Orange G discoloration.
• Optimized conditions achieved near-complete Orange G conversion in 90 minutes and 34.4% TOC removal in 4 hours.
• The catalyst demonstrated excellent stability, maintaining activity over 42 cycles (168 hours).

Conclusions:

• The developed hierarchically structured PBNP/TiO2 composite is a highly stable and effective catalyst for heterogeneous Fenton-type oxidation.
• The catalyst shows significant potential for efficient and sustainable removal of organic pollutants from wastewater.
• The synthesis method is versatile and cost-effective, paving the way for practical applications.