Cited by 242TiO2 Photocatalysis and Solar CellsAdvanced oxidation water treatmentAdvanced Photocatalysis Techniques

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Microwave photocatalytic degradation of Rhodamine B using TiO2 supported on activated carbon: Mechanism implication

HE, Zhong, YANG, Shaogui, JU, Yongming, SUN, Cheng·2009·Journal of Environmental Sciences

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Abstract

The photocatalytic degradation of Rhodamine B (RhB) was carried out using TiO2 supported on activated carbon (TiO2-AC) under microwave irradiation. Composite catalyst TiO2-AC was prepared and characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET). In the process of microwave-enhanced photocatalysis (MPC), RhB (30 mg/L) was almost completely decoloured in 10 min, and the mineralization efficiency was 96.0% in 20 min. The reaction rate constant of RhB in MPC using TiO2-AC by pseudo first-order reaction kinetics was 4.16 times of that using Degussa P25. Additionally, according to gas chromatography/mass spectrometry (GC/MS) and liquid chromatography/mass spectrometry (LC/MS) identification, the major intermediates of RhB in MPC included two kinds of N-de-ethylation intermediates (N,N-diethyl-N'-ethyl-rhodamine (DER)), oxalic acid, malonic acid, succinic acid, and phthalic acid, maleic acid, 3-nitrobenzoic acid, and so on. The degradation of RhB in MPC was mainly attributed to the destruction of the conjugated structure, and then the intermediates transformed to acid molecules which were mineralized to water and carbon dioxide.

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Confirmation of hydroxyl radicals (•OH) generated in the presence of TiO2 supported on AC under microwave irradiation
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Authors: HE, Z., YANG, S., JU, Y., & SUN, C.
Affiliations: State Key Laboratory of Pollution Control and Resource Reuse (CN)
Corresponding author: SUN, Cheng
ORCID: YANG, Shaogui
JU, Yongming
SUN, Cheng
Venue: Journal of Environmental Sciences
Publisher: Elsevier BV
Published: 2009
Volume: 21
Issue: 2
Pages: 268-272
ISSN: 1001-0742 (ISSN-L)
DOI: 10.1016/s1001-0742(08)62262-7
OpenAlex: W2039530054
Cited by: 242
References: 14
Citations by year: 2026: 13 · 2025: 12 · 2024: 10 · 2023: 14 · 2022: 15 · 2021: 17 · 2020: 20 · 2019: 23 · 2018: 14 · 2017: 21 · 2016: 11 · 2015: 19 · 2014: 11 · 2013: 18 · 2012: 11
FWCI: 3.75
Type: journal article
Language: en
Open access: closed
Licence: www.elsevier.com/tdm/userlicense/1.0/ (tdm)
www.elsevier.com/legal/tdmrep-license (tdm)
Locations: Journal of Environmental Sciences (publishedVersion)
PubMed (publishedVersion)
Funders: National Natural Science Foundation of China
Topics: Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › TiO2 Photocatalysis and Solar Cells
Physical Sciences › Environmental Science › Water Science and Technology › Advanced oxidation water treatment
Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Advanced Photocatalysis Techniques
Keywords: rhodamine B, photocatalytic degradation, TiO2/activated carbon composite, dye mineralization, degradation intermediates, reaction kinetics, mineralization
MeSH terms: Catalysis, Charcoal, Chromatography, Liquid, Kinetics, Gas Chromatography-Mass Spectrometry, Microscopy, Electron, Scanning, Microwaves, Photolysis, Rhodamines, Titanium, X-Ray Diffraction

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Microwave photocatalytic degradation of Rhodamine B using TiO2 supported on activated carbon: Mechanism implication

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