Highly Efficient Degradation of Persistent Pollutants with 3D Nanocone TiO₂-Based Photoelectrocatalysis

Area of Science:

• Environmental Science and Engineering
• Materials Science
• Catalysis

Background:

• Photoelectrocatalytic (PEC) degradation offers a promising route for eliminating organic pollutants.
• Titanium dioxide (TiO2) is a widely used PEC catalyst, but its efficiency is hampered by rapid electron-hole recombination.

Purpose of the Study:

• To develop a novel TiO2-based photoelectrocatalyst with enhanced PEC degradation performance and durability.
• To investigate the effect of nanocone morphology on the PEC activity of TiO2.

Main Methods:

• Synthesis of TiO2 nanocone-based photoelectrocatalyst.
• Evaluation of PEC degradation efficiency and mineralization of 4-chlorophenol (4-CP).
• Characterization of catalyst morphology and performance comparison with nanorod and aggregated particle catalysts.
• Computational fluid dynamics (CFD) simulations to assess mass transfer properties.

Main Results:

• The TiO2 nanocone catalyst achieved 99% degradation and over 55% mineralization of 4-CP.
• The nanocone catalyst exhibited a normalized apparent rate constant 3-6 times higher than nanorod and aggregated particle catalysts.
• Conical morphology improved photogenerated charge separation, transfer efficiency, and mass transportation.

Conclusions:

• Tailoring TiO2 morphology to a nanocone structure significantly enhances PEC activity for pollutant degradation.
• The improved performance is attributed to enhanced charge dynamics and mass transport facilitated by the unique structure.
• This study demonstrates the potential of nanostructured TiO2 for efficient and durable environmental remediation.