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Enhanced pollutant photodegradation over nanoporous titanium-vanadium oxides with improved interfacial interactions
Milad Laghaei1, Mohsen Ghasemian2, Mahmoud Reza Ghandehari Ferdowsi3
1School of Engineering, Deakin University, Waurn Ponds, VIC 3216, Australia; Institute for Frontier Materials, Deakin University, Waurn Ponds, VIC 3216, Australia.
Journal of Colloid and Interface Science
|May 13, 2023
Summary
Researchers developed novel titanium-vanadium oxide nanoporous composites for efficient separation of colloidal catalytic powder. This advanced material shows high performance in environmental remediation, particularly in degrading methylene blue.
Area of Science:
- Materials Science
- Nanotechnology
- Environmental Chemistry
Background:
- Traditional metallic oxides face challenges in colloidal catalytic powder separation and pore blockage.
- Developing efficient photocatalysts is crucial for environmental remediation applications.
Purpose of the Study:
- To fabricate and characterize novel nanoporous titanium-vanadium (Ti-V) oxide composites.
- To investigate the effect of vanadium loading on the physicochemical properties and photocatalytic activity.
- To correlate material properties with the photodegradation performance of methylene blue.
Main Methods:
- Fabrication of Ti-V oxide composites using magnetron sputtering, electrochemical anodization, and annealing.
- Varying vanadium sputtering power (20-250 W) to control V loading.
- Characterization of pore structure, crystalline phases, and band gap.
- Evaluation of photocatalytic performance via methylene blue degradation under simulated solar irradiation.
Main Results:
- Nanoporous composites with circular/elliptical pores (14-23 nm) were successfully synthesized.
- Vanadium incorporation led to Ti3+ formation, reduced band gap (3.15 eV for TiO2 to 2.47 eV for max V content), and enhanced visible-light absorption.
- High V content decreased photoactivity due to charge carrier trapping.
- Minimum V content yielded ~90% degradation efficiency via homogeneous V dispersion and p-n heterojunction, minimizing charge recombination.
Conclusions:
- Nanoporous Ti-V oxide composites offer a promising solution for colloidal catalyst separation and environmental remediation.
- Optimized V loading is critical for maximizing photocatalytic efficiency.
- The developed materials demonstrate significant potential for broader environmental cleanup applications.
