An Advanced Dual‐Function MnO<sub>2</sub>‐Fabric Air Filter Combining Catalytic Oxidation of Formaldehyde and High‐Efficiency Fine Particulate Matter Removal

Dai, Zijian; Zhu, Jing; Yan, Jiaqi; Su, Jiafei; Gao, Yunfei; Zhang, Xing; Ke, Qinfei; Parsons, Gregory N.

doi:10.1002/adfm.202001488

Cited by 58 publications

(26 citation statements)

References 68 publications

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“…[28] In this section, the catalytic activity for HCHO removal on Al 2 O 3 membrane and MIL-53(Al)-NH 2 FMMM were investigated following the procedure reported in literature. [44] The results shown in Figure 5C,D confirm the heterogeneous catalysis of HCHO on this FMMM. [45] A piece of MIL-53(Al)-NH 2 FMMM (0.05 g) could remove most of HCHO molecules in 20 min, and achieve 99.95% efficiency within 60 min (Figure 5C).…”

Section: Multiple Performance Of Fmmmsupporting

confidence: 56%

Freestanding Metal Organic Framework‐Based Multifunctional Membranes Fabricated via Pseudomorphic Replication toward Liquid‐ and Gas‐Hazards Abatement

Dai

Pradeep

Zhu

et al. 2021

Adv Materials Inter

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range of appealing properties are observed on MOFs, such as high surface areas and porosity, ordered open channels, and tunable functionalities, making them attractive for applications in gas storage, [2,3] separation, [4,5] catalysis, [6,7] sensing, [8] and environmental decontamination. [9] However, their utilization in above applications is limited due to the brittle nature in powder phase. As a result, further handling and processing is required for industrial applications. As reported in literature, MOF-membrane integration is a robust strategy to extend the exceptional properties of MOFs by providing them the required structural integrity, this can be achieved by growing MOF layers on substrates [10][11][12] or by incorporating MOF crystals into mixed matrix membranes (MMMs). [13][14][15] The later approach is the most attractive scenario, because high MOF loadings can be achieved. The MMMs show marked advantages to the single component, since MOF crystals provide rich molecular sieving sites and the polymeric membrane substrates are easy to handle and process.While the MOF-based MMMs exhibit excellent priorities, there still remain limitations on the mixed-matrix approach: [14,16] i) trade-offs between MOF loadings and membrane functions. Specifically, high MOF loadings generally increase the possibility of phase separation, decreasing strength, and creating cracks, while low loadings usually result in insufficient selectivity due to the reduced number of active sites; and ii) the existence of by-pass caused by interfacial voids between polymers and MOFs would inevitably hinder the real separation performance, which leads to an unpredictable and low selectivity.In order to eliminate these concerns, we propose a robust methodology to produce substrate-free MOF membranes via a pseudomorphic replication synthesis route. Pseudomorphic replication, stemmed from the natural pseudomorphic mineral replacement phenomenon, had been initially introduced by Kitagawa and his coworkers concerning shaped and assembled synthesis of MOF structures. [17] Through the coordination-driven pseudomorphic replication of MOF conversion, precise spatial localization of MOF crystal crystallization can be achieved. [18] Additionally, it was observed that the MOF replica would retain the original physical structure, including shapes and dimensions from its parent phase. Inspired by Metal organic framework (MOF)-based adsorptive membranes are attractive materials in high flux separation and/or in abatement of hazardous materials. However, fabrication of continuous MOF membrane with ultra-high loading and anti-solvent property is a challenging task. Here, the authors report a coordination replication synthetic approach via a morphological replacement procedure that employs pre-shaped Al 2 O 3 microfiltration membrane to produce freestanding MOF multifunctional membrane (FMMMs). The authors achieve precise control of crystal size, morphology, and orientation on the FMMMs. Moreover, the intrinsic porous structure inherited from Al 2 O 3 p...

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Section: Multiple Performance Of Fmmmsupporting

confidence: 56%

Freestanding Metal Organic Framework‐Based Multifunctional Membranes Fabricated via Pseudomorphic Replication toward Liquid‐ and Gas‐Hazards Abatement

Dai

Pradeep

Zhu

et al. 2021

Adv Materials Inter

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Section: Physical Treatmentmentioning

confidence: 99%

“…ALD has been further promoted to deposit ZnO, Al 2 O 3 , and TiO 2 on the surface of polypropylene for coupling volatile organic compound oxidation catalysts in Figure 12c. [ 120 ] The thin films combined MnO 2 crystals with the largest fraction of available surface oxygen groups, resulting in 99.5% reduction of formaldehyde after 60 min, which was a huge improvement. This offered a good solution to fabricate light‐weight structural composites with enhanced interfacial properties.…”

Section: Physical Treatmentmentioning

confidence: 99%

Fiber Surface/Interfacial Engineering on Wearable Electronics

Xiao

et al. 2021

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Surface/interfacial engineering is an essential technique to explore the fiber materials properties and fulfil new functionalities. An extensive scope of current physical and chemical treating methods is reviewed here together with a variety of real‐world applications. Moreover, a new surface/interface engineering approach is also introduced: self‐assembly via π–π stacking, which has great potential for the surface modification of fiber materials due to its nondestructive working principle. A new fiber family member, metal‐oxide framework (MOF) fiber shows promising candidacy for fiber based wearable electronics. The understanding of surface/interfacial engineering techniques on fiber materials is advanced here and it is expected to guide the rational design of future fiber based wearable electronics.

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“…The upstream and downstream photometers are used to measure the aerosol quantities on both of the upstream and downstream sides of the filters. Then the filtration efficiency can be calculated as follows in Equation (1) [20,21].…”

Section: Characterizationmentioning

confidence: 99%

The Effect of Temperature and Humidity on the Filtration Performance of Electret Melt-Blown Nonwovens

Liu

Dai

et al. 2020

Materials

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Electret melt-blown nonwovens are widely used for air purification due to their low pressure drop and high filtration efficiency. However, the charge stability could be affected by the ambient temperature and humidity, reducing the filtration efficiency, resulting in the electret melt blown filter not providing effective protection. Herein, we used corona charge to prepare electret melt-blown nonwovens and systematically studied the effects of different temperature and humidity on the structure, morphology, filtration performance, and surface potential within 24 h. The effect of treatment temperature and humidity on pressure drop was minimal because the fiber morphology and web structure of melt-blown nonwovens were not damaged. When the treatment temperature was lower than 70 °C, the effect on the filtration efficiency of the sample was small, but when the temperature increased to 90 or 110 °C, the filtration efficiency decreased significantly with the increase of the treatment time, and the surface potential also declined similarly. In conclusion, high temperatures will lead to charge escape and reduce the electrostatic adsorption effect. Furthermore, at the same temperature, increasing relative humidity can accelerate the charge release and make the filtration efficiency drop more. After the sample was treated at 110 °C and 90% relative humidity for 24 h, the filtration efficiency decreased from 95.49% to 38.16% at a flow rate of 14.16 cm s−1, and the surface potential dropped to the lowest value of −1.01 kV. This result shows that all links of electret melt-blown filter material from raw material to final use should be avoided in high temperature and high humidity conditions to ensure the protection effect.

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An Advanced Dual‐Function MnO₂‐Fabric Air Filter Combining Catalytic Oxidation of Formaldehyde and High‐Efficiency Fine Particulate Matter Removal

Cited by 58 publications

References 68 publications

Freestanding Metal Organic Framework‐Based Multifunctional Membranes Fabricated via Pseudomorphic Replication toward Liquid‐ and Gas‐Hazards Abatement

Freestanding Metal Organic Framework‐Based Multifunctional Membranes Fabricated via Pseudomorphic Replication toward Liquid‐ and Gas‐Hazards Abatement

Fiber Surface/Interfacial Engineering on Wearable Electronics

The Effect of Temperature and Humidity on the Filtration Performance of Electret Melt-Blown Nonwovens

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An Advanced Dual‐Function MnO2‐Fabric Air Filter Combining Catalytic Oxidation of Formaldehyde and High‐Efficiency Fine Particulate Matter Removal

Cited by 58 publications

References 68 publications

Freestanding Metal Organic Framework‐Based Multifunctional Membranes Fabricated via Pseudomorphic Replication toward Liquid‐ and Gas‐Hazards Abatement

Freestanding Metal Organic Framework‐Based Multifunctional Membranes Fabricated via Pseudomorphic Replication toward Liquid‐ and Gas‐Hazards Abatement

Fiber Surface/Interfacial Engineering on Wearable Electronics

The Effect of Temperature and Humidity on the Filtration Performance of Electret Melt-Blown Nonwovens

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An Advanced Dual‐Function MnO₂‐Fabric Air Filter Combining Catalytic Oxidation of Formaldehyde and High‐Efficiency Fine Particulate Matter Removal