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Catalytic wet peroxide oxidation of methyl orange over bifunctional Pd/Fe-MOF catalysts with in-situ generated H2O2.

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Title: Catalytic wet peroxide oxidation of methyl orange over bifunctional Pd/Fe-MOF catalysts with in-situ generated H2O2.
Authors: Vo, Viet Le Nam1, Lee, Yu-Ri1 yrlee@kunsan.ac.kr, Chung, Young-Min1 ymchung@kunsan.ac.kr
Source: Molecular Catalysis. Sep2025, Vol. 584, pN.PAG-N.PAG. 1p.
Subjects: Palladium catalysts, Peroxidation, Hydrogen peroxide, Wastewater treatment, Metal-organic frameworks, Organic dyes
Abstract: • Catalytic wet peroxidation of methyl orange was explored with H 2 O 2 (CWPO-I) and H 2 /air (CWPO-II). • There was significant mass loss and reduced activity of Fe-MOFs during CWPO-I. • In CWPO-II, in-situ H₂O₂ generation helped maintain Pd/Fe-MOF structure and activity. • Pd/MIL-100(Fe) activity in CWPO-II was 1.2 times higher than that of MIL-100(Fe) in CWPO-I. • CWPO-II offers an efficient wastewater treatment with minimized environmental impact. This study aimed to develop an elegant strategy to overcome the limitations of conventional dosage-dependent Fenton-like reactions, which require excessive use of metal salts and oxidants, inevitably leading to sludge formation and necessitating complex, energy-intensive post-treatment before disposal into the environment. To achieve this goal, catalytic wet peroxide oxidation (CWPO) was explored using both pre-added H 2 O 2 (CWPO-I) and in-situ generated H 2 O 2 (CWPO-II). For this purpose, four different Fe-based metal-organic frameworks (Fe-MOFs), e.g., MIL-88A, MIL-101(Fe), Fe-MOF-74, and MIL-100(Fe), along with their Pd-supported counterparts (Pd/Fe-MOFs) were prepared and evaluated for their catalytic activity in the CWPO of methyl orange (MO). Although Fe-MOFs effectively promoted the CWPO-I of MO, their coordinated structures were highly susceptible to reactive oxygen species (ROS) attacks, resulting in significant mass loss and decreased catalytic activity after the reaction. In contrast, Pd/Fe-MOFs demonstrated excellent stability in CWPO-II, suggesting that the relatively low H 2 O 2 concentration generated in-situ helped preserve the Fe-MOF structures and maintain their catalytic activity. Furthermore, the MO degradation rates of Pd/MIL-101(Fe) and Pd/MIL-100(Fe) in CWPO-II (1361 and 1992 × 10–5 mmol/h, respectively) exceeded those of their counterparts in CWPO-I (1097 and 1657 × 10–5 mmol/h, respectively). This superior efficiency can be attributed to the sufficient in-situ generation of H 2 O 2 on Pd sites and the subsequent efficient ROS generation on Fe nodes. Pd/MIL-100(Fe) exhibited the highest MO degradation rate and excellent recyclability, maintaining its catalytic activity over four cycles. These findings clearly demonstrate that the CWPO-II approach, leveraging in-situ generated H 2 O 2 , offers an efficient wastewater treatment strategy without the need for additional chemicals that could negatively impact the ecosystem. [Display omitted] [ABSTRACT FROM AUTHOR]
Copyright of Molecular Catalysis is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Catalytic wet peroxide oxidation of methyl orange over bifunctional Pd/Fe-MOF catalysts with in-situ generated H2O2.
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  Data: <searchLink fieldCode="AR" term="%22Vo%2C+Viet+Le+Nam%22">Vo, Viet Le Nam</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Lee%2C+Yu-Ri%22">Lee, Yu-Ri</searchLink><relatesTo>1</relatesTo><i> yrlee@kunsan.ac.kr</i><br /><searchLink fieldCode="AR" term="%22Chung%2C+Young-Min%22">Chung, Young-Min</searchLink><relatesTo>1</relatesTo><i> ymchung@kunsan.ac.kr</i>
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  Data: <searchLink fieldCode="JN" term="%22Molecular+Catalysis%22">Molecular Catalysis</searchLink>. Sep2025, Vol. 584, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Palladium+catalysts%22">Palladium catalysts</searchLink><br /><searchLink fieldCode="DE" term="%22Peroxidation%22">Peroxidation</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrogen+peroxide%22">Hydrogen peroxide</searchLink><br /><searchLink fieldCode="DE" term="%22Wastewater+treatment%22">Wastewater treatment</searchLink><br /><searchLink fieldCode="DE" term="%22Metal-organic+frameworks%22">Metal-organic frameworks</searchLink><br /><searchLink fieldCode="DE" term="%22Organic+dyes%22">Organic dyes</searchLink>
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  Label: Abstract
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  Data: • Catalytic wet peroxidation of methyl orange was explored with H 2 O 2 (CWPO-I) and H 2 /air (CWPO-II). • There was significant mass loss and reduced activity of Fe-MOFs during CWPO-I. • In CWPO-II, in-situ H₂O₂ generation helped maintain Pd/Fe-MOF structure and activity. • Pd/MIL-100(Fe) activity in CWPO-II was 1.2 times higher than that of MIL-100(Fe) in CWPO-I. • CWPO-II offers an efficient wastewater treatment with minimized environmental impact. This study aimed to develop an elegant strategy to overcome the limitations of conventional dosage-dependent Fenton-like reactions, which require excessive use of metal salts and oxidants, inevitably leading to sludge formation and necessitating complex, energy-intensive post-treatment before disposal into the environment. To achieve this goal, catalytic wet peroxide oxidation (CWPO) was explored using both pre-added H 2 O 2 (CWPO-I) and in-situ generated H 2 O 2 (CWPO-II). For this purpose, four different Fe-based metal-organic frameworks (Fe-MOFs), e.g., MIL-88A, MIL-101(Fe), Fe-MOF-74, and MIL-100(Fe), along with their Pd-supported counterparts (Pd/Fe-MOFs) were prepared and evaluated for their catalytic activity in the CWPO of methyl orange (MO). Although Fe-MOFs effectively promoted the CWPO-I of MO, their coordinated structures were highly susceptible to reactive oxygen species (ROS) attacks, resulting in significant mass loss and decreased catalytic activity after the reaction. In contrast, Pd/Fe-MOFs demonstrated excellent stability in CWPO-II, suggesting that the relatively low H 2 O 2 concentration generated in-situ helped preserve the Fe-MOF structures and maintain their catalytic activity. Furthermore, the MO degradation rates of Pd/MIL-101(Fe) and Pd/MIL-100(Fe) in CWPO-II (1361 and 1992 × 10–5 mmol/h, respectively) exceeded those of their counterparts in CWPO-I (1097 and 1657 × 10–5 mmol/h, respectively). This superior efficiency can be attributed to the sufficient in-situ generation of H 2 O 2 on Pd sites and the subsequent efficient ROS generation on Fe nodes. Pd/MIL-100(Fe) exhibited the highest MO degradation rate and excellent recyclability, maintaining its catalytic activity over four cycles. These findings clearly demonstrate that the CWPO-II approach, leveraging in-situ generated H 2 O 2 , offers an efficient wastewater treatment strategy without the need for additional chemicals that could negatively impact the ecosystem. [Display omitted] [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Molecular Catalysis is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.mcat.2025.115297
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      – Code: eng
        Text: English
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        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Palladium catalysts
        Type: general
      – SubjectFull: Peroxidation
        Type: general
      – SubjectFull: Hydrogen peroxide
        Type: general
      – SubjectFull: Wastewater treatment
        Type: general
      – SubjectFull: Metal-organic frameworks
        Type: general
      – SubjectFull: Organic dyes
        Type: general
    Titles:
      – TitleFull: Catalytic wet peroxide oxidation of methyl orange over bifunctional Pd/Fe-MOF catalysts with in-situ generated H2O2.
        Type: main
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            NameFull: Vo, Viet Le Nam
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            NameFull: Lee, Yu-Ri
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            NameFull: Chung, Young-Min
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          Dates:
            – D: 01
              M: 09
              Text: Sep2025
              Type: published
              Y: 2025
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              Value: 584
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