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Published on: March 29, 2019
Silver-modified mesoporous TiO2 photocatalyst for water purification
Zhigang Xiong1, Jizhen Ma, Wun Jern Ng
1Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117576, Singapore.
Water Research
|January 11, 2011
Summary
Silver nanoparticles enhance titanium dioxide for effective water purification. These TiO(2)-Ag nanocomposites efficiently degrade Rhodamine B dye and disinfect E. coli bacteria under UV light.
Area of Science:
- Materials Science
- Environmental Science
- Nanotechnology
Background:
- Mesoporous anatase (TiO(2)) is a photocatalyst with potential for water purification.
- Modification with noble metal nanoparticles can enhance photocatalytic efficiency.
- Silver (Ag) nanoparticles are known to improve charge separation in photocatalysts.
Purpose of the Study:
- To synthesize and characterize TiO(2)-Ag nanocomposites for water purification.
- To evaluate the photocatalytic performance of these nanocomposites for Rhodamine B (RhB) degradation and Escherichia coli (E. coli) disinfection.
- To determine the optimal silver loading for enhanced photocatalytic activity.
Main Methods:
- Photoreduction method for synthesizing TiO(2)-Ag nanocomposites.
- Characterization using nitrogen adsorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-Visible diffuse reflectance spectroscopy (DRS).
- Evaluation of photocatalytic activity via RhB degradation and E. coli disinfection under UV irradiation.
Main Results:
- Metallic Ag nanoparticles were successfully immobilized on the TiO(2) surface.
- The TiO(2)-Ag interface formed a Schottky barrier, improving electron-hole separation.
- Enhanced adsorption of molecular oxygen led to increased reactive oxygen species (ROS) production.
- Optimal Ag loadings were 0.25 wt% for RhB degradation and 2.0 wt% for E. coli disinfection.
- The nanocomposites demonstrated stability and reusability.
Conclusions:
- TiO(2)-Ag nanocomposites are effective photocatalysts for water purification.
- Silver modification enhances TiO(2) performance by improving charge separation and oxygen adsorption.
- The developed nanocomposites offer a stable and reusable solution for degrading organic pollutants and inactivating bacteria.
