Enhanced Photocatalytic Degradation of Dye Pollutants under Visible Irradiation on Al(III)-Modified TiO2: Structure, Interaction, and Interfacial Electron Transfer
Abstract
Aluminum(III)-modified TiO2 was prepared by sol-gel process via a sudden gelating method. The structure of the modified material and the local environment of aluminum were investigated using X-ray diffraction, HRTEM, XPS, 27Al MAS NMR, and xi-potential measurements. The effect of the aluminum modification on interaction between the dye and photocatalyst, the interfacial electron transfer process, and thereby the degradation of dye pollutants under visible irradiation were also examined by FTIR spectra and UV-vis diffuse reflectance spectra. It was found that, rather than incorporating into the crystal lattice of TiO2, the aluminum forms an overlayer of Al2O3 on the surface of TiO2, interfaced with Ti-O-Al bonds. It is interesting that the carboxylate-containing dyes such as Rhodamine B (RhB) adsorb preferentially on the Al2O3, rather than the Ti(IV) sites on the surface of TiO2. The photodegradation rate observed for RhB is nearly 5-fold faster than that obtained in the pristine TiO2 system. The photodegradation of dyes on the aluminum(III)-modified photocatalyst is of great dependence on the structure and anchoring group of the dyes. Structure with carboxylate as anchoring group and amino group as electron donor is favorable for degradation. The mechanistic details are discussed on the basis of experimental results.
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CFA, consisting primarily of Al2O3 and SiO2 as support, can inhibit recombination of electrons and holes effectively.
“CFA, consisting primarily of Al 2 O 3 and SiO 2 as support, can inhibit recombination of electrons and holes effectively; 177,178”
From Sustainable hybrid photocatalysts: titania immobilized on carbon materials derived from renewable and biodegradable resources (2016) · cites this paper as [177]
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- Authors
- Zhao, D., Chen, C., Wang, Y., Ma, W., Zhao, J., Rajh, T., & Zang, L.
- Affiliations
- Southern Illinois University Carbondale (US)
- Corresponding author
- Chen, Chuncheng
- Zhao, Jincai
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2007-11-27
- Volume
- 42
- Issue
- 1
- Pages
- 308-314
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2015655416
- Cited by
- 194
- References
- 45
- Citations by year
- 2026: 4 · 2025: 4 · 2024: 7 · 2023: 7 · 2022: 5 · 2021: 12 · 2020: 15 · 2019: 9 · 2018: 11 · 2017: 8 · 2016: 13 · 2015: 15 · 2014: 11 · 2013: 21 · 2012: 18
- FWCI
- 4.83
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Environmental Science & Technology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Science Foundation
- Chinese Academy of Sciences
- Ministry of Science and Technology of the People's Republic of China
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › TiO2 Photocatalysis and Solar Cells
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Advanced Photocatalysis Techniques
- Physical Sciences › Environmental Science › Water Science and Technology › Advanced oxidation water treatment
- Keywords
- photocatalytic degradation, dye pollutants, visible light photocatalysis, rhodamine B, interfacial electron transfer, dye adsorption, dye degradation mechanism
- MeSH terms
- Aluminum, Catalysis, Coloring Agents, Light, Oxidation-Reduction, Photochemistry, Titanium, Water Pollutants, Chemical, Water Purification
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