Visible-light photocatalytic O2-to-H2O2 via nitrogen-graphene quantum dots-modified Bi2Fe4O9 for synchronizing the reduction of Cr(VI) and oxidation of organic contaminants: Kinetics, mechanism, and performance
[Display omitted] •N-GQDs/Bi2Fe4O9 suppress charge recombination and electron accumulation.•N-GQDs/Bi2Fe4O9 enhances in-situ H2O2 generation and H2O2 activation.•Electrons accumulation around N-GQDs accelerate the redox cycles of Fe(II)/Fe(III).•N-GQDs/Bi2Fe4O9 achieves simultaneous toxic Cr(VI) red...
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| Vydané v: | Chemical engineering journal (Lausanne, Switzerland : 1996) Ročník 487; s. 150712 |
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| Hlavní autori: | , , , , , |
| Médium: | Journal Article |
| Jazyk: | English |
| Vydavateľské údaje: |
Elsevier B.V
01.05.2024
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| ISSN: | 1385-8947, 1873-3212 |
| On-line prístup: | Získať plný text |
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| Abstract | [Display omitted]
•N-GQDs/Bi2Fe4O9 suppress charge recombination and electron accumulation.•N-GQDs/Bi2Fe4O9 enhances in-situ H2O2 generation and H2O2 activation.•Electrons accumulation around N-GQDs accelerate the redox cycles of Fe(II)/Fe(III).•N-GQDs/Bi2Fe4O9 achieves simultaneous toxic Cr(VI) reduction and BPA oxidation in wastewater.•N-GQDs/Bi2Fe4O9 enables energy self-sufficient and simplified wastewater treatment methods.
Synergistic coexistence of toxic chromium and organic contaminants in wastewater has made treatments highly complicated. As solar-driven wastewater treatments become increasingly environmentally and economically attractive, a photocatalyst (denoted as N-GQDs/Bi2Fe4O9) is developed for photocatalytic reduction of Cr(VI) and simultaneous oxidation of organic contaminants in wastewater. Incorporating N-GQDs (as electron reservoir) into Bi2Fe4O9 modulates the band structure (from 2.40 to 2.24 eV), facilitating charge transfer and electron accumulation at N-GQDs. Due to the photo-Fenton synergistic reaction between N-GQDs/Bi2Fe4O9 photocatalysis process, N-GQDs/ Bi2Fe4O9 demonstrates excellent H2O2 generation (1.64 μM min−1) and H2O2 activation (0.0063 min−1) performance, leading to generation of more highly reactive species (i.e., OH radicals), achieving BPA removal of 99.9 % under visible-light irradiation for 100 min. Interestingly, the photo-Fenton synergistic reaction enhances the reduction of Cr(VI) (99.8 %), while the Fe(II) active sites on the N-GQDs/Bi2Fe4O9 can also promote the synchronized Cr(VI) reduction. Also, the accumulated electron around N-GQDs enhances redox cycles of Fe(II)/Fe(III) reactions to realize the sustainable photo-Fenton catalytic reaction. This new N-GQDs/Bi2Fe4O9 photocatalyst demonstrates the feasibility of concurrent reduction of toxic Cr(VI)-to-Cr(III) and oxidation of organic contaminants in wastewater with a simple process via nearly unlimited solar energy. |
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| AbstractList | [Display omitted]
•N-GQDs/Bi2Fe4O9 suppress charge recombination and electron accumulation.•N-GQDs/Bi2Fe4O9 enhances in-situ H2O2 generation and H2O2 activation.•Electrons accumulation around N-GQDs accelerate the redox cycles of Fe(II)/Fe(III).•N-GQDs/Bi2Fe4O9 achieves simultaneous toxic Cr(VI) reduction and BPA oxidation in wastewater.•N-GQDs/Bi2Fe4O9 enables energy self-sufficient and simplified wastewater treatment methods.
Synergistic coexistence of toxic chromium and organic contaminants in wastewater has made treatments highly complicated. As solar-driven wastewater treatments become increasingly environmentally and economically attractive, a photocatalyst (denoted as N-GQDs/Bi2Fe4O9) is developed for photocatalytic reduction of Cr(VI) and simultaneous oxidation of organic contaminants in wastewater. Incorporating N-GQDs (as electron reservoir) into Bi2Fe4O9 modulates the band structure (from 2.40 to 2.24 eV), facilitating charge transfer and electron accumulation at N-GQDs. Due to the photo-Fenton synergistic reaction between N-GQDs/Bi2Fe4O9 photocatalysis process, N-GQDs/ Bi2Fe4O9 demonstrates excellent H2O2 generation (1.64 μM min−1) and H2O2 activation (0.0063 min−1) performance, leading to generation of more highly reactive species (i.e., OH radicals), achieving BPA removal of 99.9 % under visible-light irradiation for 100 min. Interestingly, the photo-Fenton synergistic reaction enhances the reduction of Cr(VI) (99.8 %), while the Fe(II) active sites on the N-GQDs/Bi2Fe4O9 can also promote the synchronized Cr(VI) reduction. Also, the accumulated electron around N-GQDs enhances redox cycles of Fe(II)/Fe(III) reactions to realize the sustainable photo-Fenton catalytic reaction. This new N-GQDs/Bi2Fe4O9 photocatalyst demonstrates the feasibility of concurrent reduction of toxic Cr(VI)-to-Cr(III) and oxidation of organic contaminants in wastewater with a simple process via nearly unlimited solar energy. Synergistic coexistence of toxic chromium and organic contaminants in wastewater has made treatments highly complicated. As solar-driven wastewater treatments become increasingly environmentally and economically attractive, a photocatalyst (denoted as N-GQDs/Bi₂Fe₄O₉) is developed for photocatalytic reduction of Cr(VI) and simultaneous oxidation of organic contaminants in wastewater. Incorporating N-GQDs (as electron reservoir) into Bi₂Fe₄O₉ modulates the band structure (from 2.40 to 2.24 eV), facilitating charge transfer and electron accumulation at N-GQDs. Due to the photo-Fenton synergistic reaction between N-GQDs/Bi₂Fe₄O₉ photocatalysis process, N-GQDs/ Bi₂Fe₄O₉ demonstrates excellent H₂O₂ generation (1.64 μM min⁻¹) and H₂O₂ activation (0.0063 min⁻¹) performance, leading to generation of more highly reactive species (i.e., OH radicals), achieving BPA removal of 99.9 % under visible-light irradiation for 100 min. Interestingly, the photo-Fenton synergistic reaction enhances the reduction of Cr(VI) (99.8 %), while the Fe(II) active sites on the N-GQDs/Bi₂Fe₄O₉ can also promote the synchronized Cr(VI) reduction. Also, the accumulated electron around N-GQDs enhances redox cycles of Fe(II)/Fe(III) reactions to realize the sustainable photo-Fenton catalytic reaction. This new N-GQDs/Bi₂Fe₄O₉ photocatalyst demonstrates the feasibility of concurrent reduction of toxic Cr(VI)-to-Cr(III) and oxidation of organic contaminants in wastewater with a simple process via nearly unlimited solar energy. |
| ArticleNumber | 150712 |
| Author | Zheng, Meng-Wei Liu, Shou-Heng Paul Wang, Hong Wei, Ling-Wei Pu, Ying-Chih Nguyen, Van-Can |
| Author_xml | – sequence: 1 givenname: Ling-Wei orcidid: 0000-0002-7168-728X surname: Wei fullname: Wei, Ling-Wei organization: Department of Environmental Engineering, National Cheng Kung University, Tainan 70101, Taiwan – sequence: 2 givenname: Meng-Wei surname: Zheng fullname: Zheng, Meng-Wei organization: Department of Environmental Engineering, National Cheng Kung University, Tainan 70101, Taiwan – sequence: 3 givenname: Shou-Heng surname: Liu fullname: Liu, Shou-Heng email: shliu@mail.ncku.edu.tw organization: Department of Environmental Engineering, National Cheng Kung University, Tainan 70101, Taiwan – sequence: 4 givenname: Hong surname: Paul Wang fullname: Paul Wang, Hong organization: Department of Environmental Engineering, National Cheng Kung University, Tainan 70101, Taiwan – sequence: 5 givenname: Ying-Chih orcidid: 0000-0003-0685-7200 surname: Pu fullname: Pu, Ying-Chih organization: Department of Materials Science, National University of Tainan, Tainan 70005, Taiwan – sequence: 6 givenname: Van-Can orcidid: 0000-0003-0087-1087 surname: Nguyen fullname: Nguyen, Van-Can organization: Department of Chemical Engineering National Cheng Kung University, Tainan 70101, Taiwan |
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•N-GQDs/Bi2Fe4O9 suppress charge recombination and electron accumulation.•N-GQDs/Bi2Fe4O9 enhances in-situ H2O2 generation and H2O2... Synergistic coexistence of toxic chromium and organic contaminants in wastewater has made treatments highly complicated. As solar-driven wastewater treatments... |
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| SubjectTerms | chromium Cr(VI) reduction irradiation light Organic contaminant oxidation oxidation Photo-Fenton process photocatalysis photocatalysts Reactive oxygen species Redox cycle solar energy species toxicity wastewater |
| Title | Visible-light photocatalytic O2-to-H2O2 via nitrogen-graphene quantum dots-modified Bi2Fe4O9 for synchronizing the reduction of Cr(VI) and oxidation of organic contaminants: Kinetics, mechanism, and performance |
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