Role of oxygen vacancies and Mn sites in hierarchical Mn2O3/LaMnO3-δ perovskite composites for aqueous organic pollutants decontamination

Wang, Yuxian; Chen, Lulu; Chi, Zhaoxu; Chen, Chunmao; Duan, Xiaoguang; Xie, Yongbing; Qi, Fei; Song, Wenli; Liu, Jian; Wang, Shaobin

doi:10.1016/j.apcatb.2019.01.025

Cited by 197 publications

(67 citation statements)

References 63 publications

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“…This conclusion was similar to the conclusion drawn from the study of Zn−Fe silicate, [29a] which also had multiple active sites for ozone adsorption and decomposition. At the same time, the DFT study proved that oxygen adsorbed on oxygen vacancies at the surface of Mn 2 O 3 /LaMnO 3‐δ composites would spontaneously decompose and yield double‐oxygen species, and the O−O bonds of ozone were stretched by both Mn sites and surface hydroxyl groups [29c] …”

Section: Ozone Adsorptionmentioning

confidence: 95%

“…Wang's team [29c] studied the role of oxygen vacancies and Mn sites in Mn 2 O 3 /LaMnO 3‐δ perovskite composites for catalytic ozonation of organic pollutants in water, suggesting that oxygen vacancies, the Mn 3+ /Mn 4+ redox centers, and the surface hydroxyl groups were the potential active sites for ozone decomposition. This conclusion was similar to the conclusion drawn from the study of Zn−Fe silicate, [29a] which also had multiple active sites for ozone adsorption and decomposition.…”

Section: Ozone Adsorptionmentioning

confidence: 99%

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The Adsorption of Ozone on the Solid Catalyst Surface and the Catalytic Reaction Mechanism for Organic Components

Luo

Xie

et al. 2020

ChemistrySelect

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Ozone is a strong gas oxidant and is often considered as an important source of atomic oxygen. It can not only sterilize but also decompose most organic components in water. In organic reactions, it can be used for carbon‐carbon double bond oxidation. Because ozone is unstable and easy to decompose, the oxidations usually need to be carried out in the presence of low temperature or catalysts to improve the ozone utilization. The adsorption mechanisms of ozone on the surface of solid catalysts are different due to the characteristics of the ozone molecule and the different reaction conditions. In this paper, the adsorption and reaction mechanisms of ozone on solid catalyst surface are reviewed: Firstly, the ozone has weak alkalinity similar to that of CO, but the distribution of electrons in the ozone molecule exists the difference. The difference in electron distribution makes ozone to be a dipole. The central oxygen atom can accept electrons as the Lewis acid, while the terminal oxygens are electron donors to be the Lewis base. Secondly, the functional groups, which have Lewis acid and base sites, such as hydroxyl groups, can be adsorbed with the central or terminal oxygen of ozone to form a surface complex. Last, the solvents also have a critical effect on the adsorption of ozone and subsequent oxidation. According to the above mechanisms, the design and preparation of ozonation catalysts are also proposed to improve the ozonation selectivity.

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Section: Ozone Adsorptionmentioning

confidence: 95%

Section: Ozone Adsorptionmentioning

confidence: 99%

The Adsorption of Ozone on the Solid Catalyst Surface and the Catalytic Reaction Mechanism for Organic Components

Luo

Xie

et al. 2020

ChemistrySelect

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“…In addition, permeability and selectivity of MD membranes are negligibly affected by osmotic pressure and fouling 25,26 . Regarding the advanced oxidation process, certain types of perovskites have been shown to interact with water and dissolved molecular oxygen to form reactive oxygen radicals, which can degrade organic pollutants 27 . Thermocatalytic perovskites have no need for addition of chemicals or light sources and therefore they demonstrate advantages over the other advanced oxidation processes in terms of energy saving and simplicity of operation.…”

Section: Introductionmentioning

confidence: 99%

Thermocatalytic membrane distillation for clean water production

et al. 2020

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Natural water bodies and treated wastewaters contain an increasing variety of organic micropollutants with a negative impact on ecosystems and human health. Herein, we propose an integrated process based on membrane distillation and advanced oxidation, in which thermal energy is simultaneously used to drive the permeation of pure water through a hydrophobic membrane and to activate the generation of reactive oxygen species by a thermocatalytic perovskite, namely Ce-doped strontium ferrate. At a feed temperature of 65°C, our thermocatalytic distillation apparatus can effectively retain and degrade bisphenol A, as model pollutant, while producing distilled water at the constant rate of 1.60 ± 0.03 L h −1 m −2 , over four continuous runs. Moreover, the membrane makes degradation faster by concentrating the pollutant during filtration. Our technology is effective in the production of pure water without creating a toxic concentrate, it relies on simple process design, and it does not require high pressure or additional chemicals. In addition, it can potentially work continuously driven by renewable thermal energies or waste heat.

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“…A theoretical study through density functional theory (DFT) calculation gives an explicit demonstration of the adsorption process and O 3 disassociation pathways. [ 43 ] Results show that Lewis acid sites, like surface hydroxyl groups, oxygen vacancies, and B‐site cations (i.e., Mn) would be active to facilitate the adsorption. For the hydroxyl groups on the surface, simulation indicates that the single‐bonded O atom in ozone molecule can bond with surface hydroxyl groups via weak covalent bond, and the length of OO bond in O 3 can be stretched slightly due to the lower adsorption energy (−0.46 to −0.79 eV for different configurations of hydroxyl groups).…”

Section: Recent Progress Of Perovskite Oxide In Aopsmentioning

confidence: 99%

Perovskite Oxide Catalysts for Advanced Oxidation Reactions

Wang

Chen

Shao

et al. 2021

Adv Funct Materials

Self Cite

100

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Meeting the escalating demand for clean water resources is one of the key challenges to ensure a sustainable future. Catalysis plays an important role to advance the chemical reactions required for wastewater efficient remediation. How to exploit high-performance catalysts to boost the pivotal reaction kinetics always attracts researchers' enthusiasm. Perovskite oxides as a novel class of functional materials can be tuned to confer compositional flexibilities and provide rich and unique structural properties. As the rising-star material, it has been widely probed for electrocatalysis, photocatalysis, and membrane-catalysis for energy conversion, but received less attention in water treatment. In this review, the advances of perovskite oxides for advanced oxidation processes (AOPs) in water remediation are comprehensively elaborated. A fundamental understanding of the crystal structures and properties of perovskite oxides as well as the basic principles of AOPs is firstly provided. Then, emphasis is placed on how to tune the perovskite oxides to suit various AOPs. The strategies to design novel perovskite oxides to enhance the catalytic activities in AOPs have been highlighted. It is expected that after reading this review, readers will have a clearer vision of the background, the state of the art development, and general guidelines for future directions regarding research in this area.

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Role of oxygen vacancies and Mn sites in hierarchical Mn2O3/LaMnO3-δ perovskite composites for aqueous organic pollutants decontamination

Cited by 197 publications

References 63 publications

The Adsorption of Ozone on the Solid Catalyst Surface and the Catalytic Reaction Mechanism for Organic Components

The Adsorption of Ozone on the Solid Catalyst Surface and the Catalytic Reaction Mechanism for Organic Components

Thermocatalytic membrane distillation for clean water production

Perovskite Oxide Catalysts for Advanced Oxidation Reactions

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