Efficient catalytic aerobic oxidation of chlorinated phenols with mixed-valent manganese oxide nanoparticles

“…Manganese oxides have various catalytic applications due to highly efficient redox properties, and the mixed valence has been confirmed to be important in redox catalysis as well as in energy and electron transfer [23, 25, 26]. Tu and co-workers demonstrated that manganese oxides (II, III, IV, and VII) have significant advantages over other oxidants in removing organic pollutants [25]. Furthermore, it has been confirmed that reduced manganese oxide can readily be reoxidized by dioxygen, meaning that manganese oxide can play as an electron-transfer mediator to generate a rapid electron-transfer path during oxidation reactions [27].…”

Section: Introductionmentioning

confidence: 99%

Tuning the Synthesis of Manganese Oxides Nanoparticles for Efficient Oxidation of Benzyl Alcohol

et al. 2017

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The liquid phase oxidation of benzyl alcohol is an important reaction for generating benzaldehyde and benzoic acid that are largely required in the perfumery and pharmaceutical industries. The current production systems suffer from either low conversion or over oxidation. From the viewpoint of economy efficiency and environmental demand, we are aiming to develop new high-performance and cost-effective catalysts based on manganese oxides that can allow the green aerobic oxidation of benzyl alcohol under mild conditions. It was found that the composition of the precursors has significant influence on the structure formation and surface property of the manganese oxide nanoparticles. In addition, the crystallinity of the resulting manganese nanoparticles was gradually improved upon increasing the calcination temperature; however, the specific surface area decreased obviously due to pore structure damage at higher calcination temperature. The sample calcined at the optimal temperature of 600 °C from the precursors without porogen was a Mn3O4-rich material with a small amount of Mn2O3, which could generate a significant amount of species on the surface that contributed to the high catalytic activity in the oxidation. Adding porogen with precursors during the synthesis, the obtained catalysts were mainly Mn2O3 crystalline, which showed relatively low activity in the oxidation. All prepared samples showed high selectivity for benzaldehyde and benzoic acid. The obtained catalysts are comparable to the commercial OMS-2 catalyst. The synthesis–structure–catalysis interaction has been addressed, which will help for the design of new high-performance selective oxidation catalysts.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-016-1777-y) contains supplementary material, which is available to authorized users.

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“…The many oxidation states of manganese (II, III, IV and VII) provide manganese oxide with significant advantages as a redox medium for scavenging of reactive oxygen species (ROS) [2], which is solely responsible for generating oxidative stress in living system. In vertebrates, liver is the primary target organ for oxidative stress and related damage due to its unique metabolic function and relationship to the gastrointestinal (GI) tract [3].…”

mentioning

confidence: 99%

Citrate Functionalized Mn ₃ O ₄ in Nanotherapy of Hepatic Fibrosis by Oral Administration

Adhikari

Polley

Darbar³

et al. 2016

Future Science OA

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Aim:To test the potential of orally administered citrate functionalized Mn3O4 nanoparticles (C-Mn3O4 NPs) as a therapeutic agent against hepatic fibrosis and associated chronic liver diseases.Materials & methods:C-Mn3O4 NPs were synthesized and the pH dependent antioxidant mechanism was characterized by in vitro studies. CCl4 intoxicated mice were orally treated with C-Mn3O4 NPs to test its in vivo antioxidant and antifibrotic ability.Results:We demonstrated ultrahigh efficacy of the C-Mn3O4 NPs in treatment of chronic liver diseases such as hepatic fibrosis and cirrhosis in mice compared with conventional medicine silymarin without any toxicological implications.Conclusion:These findings may pave the way for practical clinical use of the NPs as safe medication of chronic liver diseases associated with fibrosis and cirrhosis in human subjects.

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Efficient catalytic aerobic oxidation of chlorinated phenols with mixed-valent manganese oxide nanoparticles

Abstract: BACKGROUND: Mixed-valence manganese oxide nanoparticles (nano-MnO x ) were prepared by the oxidation of Mn (II) with Mn-oxdizing bacteria Pseudomonas sp. G7. The chlorophenols transformation process was studied in detail.

Cited by 25 publications

References 36 publications

Enhanced catalytic degradation of ciprofloxacin over Ce-doped OMS-2 microspheres

Enhanced catalytic degradation of ciprofloxacin over Ce-doped OMS-2 microspheres

Tuning the Synthesis of Manganese Oxides Nanoparticles for Efficient Oxidation of Benzyl Alcohol

Citrate Functionalized Mn ₃ O ₄ in Nanotherapy of Hepatic Fibrosis by Oral Administration

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Efficient catalytic aerobic oxidation of chlorinated phenols with mixed-valent manganese oxide nanoparticles

Abstract: BACKGROUND: Mixed-valence manganese oxide nanoparticles (nano-MnO x ) were prepared by the oxidation of Mn (II) with Mn-oxdizing bacteria Pseudomonas sp. G7. The chlorophenols transformation process was studied in detail.

Cited by 25 publications

References 36 publications

Enhanced catalytic degradation of ciprofloxacin over Ce-doped OMS-2 microspheres

Enhanced catalytic degradation of ciprofloxacin over Ce-doped OMS-2 microspheres

Tuning the Synthesis of Manganese Oxides Nanoparticles for Efficient Oxidation of Benzyl Alcohol

Citrate Functionalized Mn 3 O 4 in Nanotherapy of Hepatic Fibrosis by Oral Administration

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Citrate Functionalized Mn ₃ O ₄ in Nanotherapy of Hepatic Fibrosis by Oral Administration