Faceted TiO2 photocatalytic degradation of anthraquinone in aquatic solution under solar irradiation
Abstract
Anthraquinone (AQ), a common oxygenated polycyclic aromatic hydrocarbon (PAH) in the water environment, often occurs with higher concentrations than its parent anthracene as it is the dominant intermediate from anthracene during both wastewater treatment and transformation in natural waters. During the elimination of PAHs and their intermediates, the water matrix often induces positive or negative effects. In this paper, photocatalytic degradation of AQ in the presence of inorganic ions (NO 3-, HCO 3-, Fe 3+) and organic matter (humic acid) was studied with {101} and {010}-TiO 2 as sunlight-driven photocatalysts. Meanwhile, the effect of dissolved oxygen (DO) on photocatalytic degradation of AQ was evaluated. The results showed that NO 3- had a slight suppressing effect, while HCO 3- and Fe 3+ promoted the photocatalytic activity due to formation of new oxidizers (CO 3- and H 2 O 2). Interestingly, HA could envelope {101}-TiO 2 to inhibit photodegradation; however, it had almost no effect on {010}-TiO 2 due to the different surface structures and properties. High dissolved oxygen content in water could markedly promote the photodegradation of AQ. This was consistent with the results of scavenging experiments, which demonstrated that O 2- and h+ played more important roles than OH did. A small amount of benzene was detected as an intermediate product of AQ by LC-QTOF-MS analysis. Hopefully, this work can contribute to the understanding of the potential of water remediation by faceted photocatalysts.
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The intensity of EPR signals for ·OH decreased with the increase in HCO3- concentration, indicating strong scavenging of ·OH by HCO3-.
“The intensity of EPR signals for · OHis decreased with the increase in HCO3 -concentration. It indicates the strong scavenging of · OHby HCO3 -[110].”
From Advanced Oxidation Processes for Degradation of Water Pollutants—Ambivalent Impact of Carbonate Species: A Review (2023) · cites this paper as [110]
The oxidation of carbonate ions by the hole acts as an additional source for carbonate radicals in the medium.
“The oxidation of carbonate ions by the hole acts as an additional source for carbonate radicals in the medium [110].”
From Advanced Oxidation Processes for Degradation of Water Pollutants—Ambivalent Impact of Carbonate Species: A Review (2023) · cites this paper as [110]
An enhancement effect was reported for anthraquinone (AQ) during photocatalytic degradation with faceted TiO2; the rate of degradation increased from 0.0089 min-1 to 0.0109 min-1 in the presence of 100 mgL-1 bicarbonate ion.
“An enhancement effect was reported for anthraquinone (AQ) during the photocatalytic degradation with faceted TiO2. In this case, the rate of degradation was increased from 0.0089 min -1 to 0.0109 min -1 in the presence of 100 mgL -1 bicarbonate ion.”
From Advanced Oxidation Processes for Degradation of Water Pollutants—Ambivalent Impact of Carbonate Species: A Review (2023) · cites this paper as [110]
In the TiO2-CO3 2- system, the CO3 2- ion bonds with TiO2 through the oxygen atom at alkaline pH and supplements a site for the adsorption of contaminants.
“In the TiO2-CO3 2 -system, the CO3 2 -ion bonds with TiO2 through the oxygen atom at alkaline pH and supplements a site for the adsorption of contaminants (Figure 5).”
From Advanced Oxidation Processes for Degradation of Water Pollutants—Ambivalent Impact of Carbonate Species: A Review (2023) · cites this paper as [110]
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- Authors
- Ye, T., Qi, W., An, X., Liu, H., & Qu, J.
- Affiliations
- Chinese Academy of Sciences (CN)
- State Key Joint Laboratory of Environment Simulation and Pollution Control (CN)
- Corresponding author
- Qi, Weixiao
- Venue
- Science of The Total Environment
- Publisher
- Elsevier BV
- Published
- 2019-10
- Volume
- 688
- Pages
- 592-599
- ISSN
- 0048-9697 (ISSN-L)
- OpenAlex
- W2950114433
- Cited by
- 32
- References
- 45
- Citations by year
- 2026: 1 · 2024: 1 · 2023: 5 · 2022: 8 · 2021: 8 · 2020: 8 · 2019: 1
- FWCI
- 1.33
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- The Science of The Total Environment (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Natural Science Foundation of China (41203069)
- 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
- anthraquinones, photocatalytic degradation, titanium dioxide, solar irradiation, polycyclic aromatic hydrocarbons, humic acid, dissolved oxygen, nitrate, bicarbonate, iron ions, superoxide, hydroxyl radicals, water remediation
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