Macroporous MnO2-based aerogel crosslinked with cellulose nanofibers for efficient ozone removal under humid condition

Cao, Ranran; Li, Lianxin; Zhang, Pengyi

doi:10.1016/j.jhazmat.2020.124793

Cited by 40 publications

(19 citation statements)

References 52 publications

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“…The O 1s spectra of the catalysts in Figure S8 also show the accumulation of MnO x clusters in 4.0Mn-PSBA and 3.0Mn-SBA because one peak at 530.05 eV ascribed to Mn−O−Mn is observed. 33 TEM, XRD, Raman, FTIR, and XPS analyses collectively confirm that 3.0Mn-PSBA has the strongest EMSI between MnO x clusters and SBA-15, and the EMSI effect accomplishes the electronic control of MnO x clusters.…”

Section: Resultsmentioning

confidence: 72%

Enhanced Catalytic Ozonation for Eliminating CH₃SH via Stable and Circular Electronic Metal–Support Interactions of Si–O–Mn Bonds with Low Mn Loading

Liu

Huang

et al. 2022

Environ. Sci. Technol.

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Catalytic ozonation of methyl mercaptan (CH3SH) can effectively control this unbearable odorous sulfur-containing volatile organic compound (S-VOC). The construction of an electronic metal–support interaction (EMSI) coordination structure to maximize the number of active sites and increase the intrinsic activity of active sites is an effective means to improve catalytic performance. In this work, the abundant Si–OH groups on PSBA-15 (SBA-15 before calcination) were used to anchor Mn to form a Si–O–Mn-based EMSI coordination structure. Detailed characterizations and theoretical simulations reveal that the strong EMSI effect significantly adjusts and stabilizes the electronic structure of Mn 3d states, resulting in an electron-rich center on the Si–O–Mn bond to promote the specific adsorption/activation of ozone (O3) and an electron-poor center on the (Si–O−)Mn–O bond to adsorb a large amount of CH3SH accompanied by its own oxidative degradation. In situ Raman and in situ Fourier transform infrared (FTIR) analyses identify that catalytic ozonation over 3.0Mn-PSBA generates atomic oxygen species (AOS/*O) and reactive oxygen species (ROS/•O2 –) to achieve efficient decomposition of CH3SH into CO2/SO4 2–. Furthermore, the electrons obtained from CH3SH in electron-poor centers are transferred to maintain the redox cycle of Mn2+/3+ → Mn4+ → Mn2+/3+ through the internal bond bridge, thus accomplishing the efficient and stable degradation of CH3SH prolonged to 180 min. Therefore, the rational design of catalysts with abundant active sites and optimized inherent activity via the EMSI effect can provide significant potential to improve catalytic performance and eliminate odorous gases.

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Section: Resultsmentioning

confidence: 72%

Enhanced Catalytic Ozonation for Eliminating CH₃SH via Stable and Circular Electronic Metal–Support Interactions of Si–O–Mn Bonds with Low Mn Loading

Liu

Huang

et al. 2022

Environ. Sci. Technol.

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“…The structure, purity, and/or porosity of these reference materials were confirmed (Supplementary Figs. [16][17][18][19][20][21][22]. As shown in Fig.…”

Section: Catalytic Activity For O 3 Decompositionmentioning

confidence: 96%

“…These results revealed that the three bimetallic MOFs were more catalytically active than PCN-250(Fe 3 ) for the decomposition reaction of O 3 , and the O 3 removal performances of PCN-250(Fe 3 ), PCN-250(Fe 2 Ni), and PCN-250(Fe 2 Mn) could be affected by the humidity of inlet gas. It is common that the O 3 decomposition performances of catalysts reduce under more humid conditions 21,22 . Notably, PCN-250(Fe 2 Co) showed 100% O 3 removal efficiency under both dry and humid conditions, suggesting that it has the highest catalytic activity among the four MOFs.…”

Section: Catalytic Activity For O 3 Decompositionmentioning

confidence: 99%

Catalytic ozone decomposition and adsorptive VOCs removal in bimetallic metal-organic frameworks

et al. 2022

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Atmospheric ozone has long been a threat to human health, however, rational design of high-performance O3-decomposition catalysts remains challenging. Herein, we demonstrate the great potential of a series of isomorphous bimetallic MOFs denoted as PCN-250(Fe2M) (M = Co2+, Ni2+, Mn2+) in catalytic O3 decomposition. Particularly, PCN-250(Fe2Co) showed 100% O3 removal efficiency for a continuous air flow containing 1 ppm O3 over a wide humidity range (0 ‒ 80% RH) at room temperature. Mechanism studies suggested that the high catalytic performance originated from the introduction of open Co(II) sites as well as its porous structure. Additionally, at low pressures around 10 Pa, PCN-250(Fe2Co) exhibited high adsorption capacities (89 ‒ 241 mg g−1) for most VOCs, which are not only a class of hazardous air pollutants but also the precursor of O3. This work opens up a new avenue to develop advanced air purification materials for O3 and VOCs removal in one.

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“…The drying stage is critical for retaining porosity and integrity. The supercritical drying approach is the best method so far for achieving well-defined structures among the many drying processes, although freeze-drying is considerably easier, less expensive, and ecofriendly [73][74][75]. On the other hand, hydrogel materials are frequently made by polymerizing acrylic monomers using a free radical initiator [76].…”

Section: Polymeric Aerogels and Hydrogelsmentioning

confidence: 99%

Advanced Polymeric Nanocomposites for Water Treatment Applications: A Holistic Perspective

Adeola

Nomngongo

2022

Polymers

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Water pollution remains one of the greatest challenges in the modern era, and water treatment strategies have continually been improved to meet the increasing demand for safe water. In the last few decades, tremendous research has been carried out toward developing selective and efficient polymeric adsorbents and membranes. However, developing non-toxic, biocompatible, cost-effective, and efficient polymeric nanocomposites is still being explored. In polymer nanocomposites, nanofillers and/or nanoparticles are dispersed in polymeric matrices such as dendrimer, cellulose, resins, etc., to improve their mechanical, thermophysical, and physicochemical properties. Several techniques can be used to develop polymer nanocomposites, and the most prevalent methods include mixing, melt-mixing, in-situ polymerization, electrospinning, and selective laser sintering techniques. Emerging technologies for polymer nanocomposite development include selective laser sintering and microwave-assisted techniques, proffering solutions to aggregation challenges and other morphological defects. Available and emerging techniques aim to produce efficient, durable, and cost-effective polymer nanocomposites with uniform dispersion and minimal defects. Polymer nanocomposites are utilized as filtering membranes and adsorbents to remove chemical contaminants from aqueous media. This study covers the synthesis and usage of various polymeric nanocomposites in water treatment, as well as the major criteria that influence their performance, and highlights challenges and considerations for future research.

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Macroporous MnO2-based aerogel crosslinked with cellulose nanofibers for efficient ozone removal under humid condition

Cited by 40 publications

References 52 publications

Enhanced Catalytic Ozonation for Eliminating CH₃SH via Stable and Circular Electronic Metal–Support Interactions of Si–O–Mn Bonds with Low Mn Loading

Enhanced Catalytic Ozonation for Eliminating CH₃SH via Stable and Circular Electronic Metal–Support Interactions of Si–O–Mn Bonds with Low Mn Loading

Catalytic ozone decomposition and adsorptive VOCs removal in bimetallic metal-organic frameworks

Advanced Polymeric Nanocomposites for Water Treatment Applications: A Holistic Perspective

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Macroporous MnO2-based aerogel crosslinked with cellulose nanofibers for efficient ozone removal under humid condition

Cited by 40 publications

References 52 publications

Enhanced Catalytic Ozonation for Eliminating CH3SH via Stable and Circular Electronic Metal–Support Interactions of Si–O–Mn Bonds with Low Mn Loading

Enhanced Catalytic Ozonation for Eliminating CH3SH via Stable and Circular Electronic Metal–Support Interactions of Si–O–Mn Bonds with Low Mn Loading

Catalytic ozone decomposition and adsorptive VOCs removal in bimetallic metal-organic frameworks

Advanced Polymeric Nanocomposites for Water Treatment Applications: A Holistic Perspective

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Enhanced Catalytic Ozonation for Eliminating CH₃SH via Stable and Circular Electronic Metal–Support Interactions of Si–O–Mn Bonds with Low Mn Loading

Enhanced Catalytic Ozonation for Eliminating CH₃SH via Stable and Circular Electronic Metal–Support Interactions of Si–O–Mn Bonds with Low Mn Loading