Mengnan Chai

China University of Geosciences (Beijing)

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Yihe Zhang

China University of Geosciences (Beijing)

Wangshu Tong

China University of Geosciences (Beijing)

Zhensheng Chen

Jiangxi Science and Technology Normal University

Tingting Cao

China University of Geosciences

Zhihao Wang

Guangzhou Institute of Energy Conversion

Yingmo Hu

China University of Geosciences (Beijing)

Yuan‐cheng An

China University of Geosciences (Beijing)

Jiahe Zhang

China University of Geosciences (Beijing)

Shuting Zhang

Nanjing University of Aeronautics and Astronautics

Yufan Li

Zhongshan Hospital

Cooperative Institutions

China University of Geosciences (Beijing)

Chinese Academy of Sciences

Sichuan University

University of Chinese Academy of Sciences

Nanjing University of Aeronautics and Astronautics

University of Science and Technology of China

Chengdu University

Ocean University of China

Shanghai University of Electric Power

Xi'an Jiaotong University

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Air Purification Using Polymer Fiber Filters

Macromolecular Materials and Engineering (2021)

Mengnan Chai Wangshu Tong Zhihao Wang Shifeng Zhao Yihe Zhang

Abstract Polymer fiber filters, with their high surface area, low cost, and easy large‐scale manufacturing, are widely used in air purification. These filters have been combined with various types of functional nanoparticles to endow them with electrostatic adsorption, photocatalysis, electrocatalysis, photoelectrocatalysis, or antibacterial properties, and improve their filtering performance. In this study, a summary of the research on single polymer and polymer composite filters for highly efficient air purification is presented. In single polymer filters, polar groups in the polymer chains, a rich porous structure, and electret process improve their removal capability. In polymer composite filters, metal–organic frameworks, porous particles, and electret materials as fillers improve the physical adsorption of the materials, while the use of photocatalysts, electrocatalysts, photoelectrocatalysts, and antibacterial agents as functional fillers endows the filters with additional chemical reactions for the complete degradation of gas and microorganism pollutants. Finally, the challenges that remain in the development of polymer filters for use in air purification are also discussed in terms of material type and fabrication technology. It is expected that polymer filters with tunable surface properties and multifunctions can realize highly efficient air purification with low energy consumption.

Air filter

Electret

10.1002/mame.202100753

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Piezoelectric-Fenton Degradation and Mechanism Study of Fe <sub>2</sub>O <sub>3</sub>/PVDF-HFP Porous Film Drove by Flowing Water

SSRN Electronic Journal (2021)

Mengnan Chai Wangshu Tong zhihao Wang zhensheng Chen Yihe Zhang

Piezocatalysis driven by a gentle force possesses broad application prospects for the degradation of organic pollutants, sterilization, wound healing, and tissue recovery. The flexible and industrially scalable poly (vinylidene fluoride) (PVDF) film is one of the most commonly used in piezocatalysis. Various functional fillers which act as piezoelectric enhancers and charge providers are added to enhance the piezocatalytic performance. However, under the action of a gentle force, piezocatalysis based on PVDF composite is poor. Herein, a flexible porous film based on poly (vinylidene fluoride)-hexafluoro propylene (PVDF-HFP) is enhanced with Fenton fillers (α-Fe2O3 nanoparticles), which not only improve the piezoelectricity and charge supply, but also introduce an extra Fenton reaction process. Under water flow, the degradation ratio of tetracycline hydrochloride in the presence of the Fe2O3/PVDF-HFP porous film is increased by ~37 times compared with that of the pure PVDF-HFP porous film. The ·O2− species present at a concentration of 30.6 µmol/L, is the main free radical produced by the piezo-Fenton catalysis of the composite film. The mechanism and reaction pathway of the piezo-Fenton reaction under flowing water is discussed and may help promote new piezocatalysis designs with high efficiency for self-powered environmental purification.

Degradation

10.2139/ssrn.3975293

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Piezoelectric-Fenton degradation and mechanism study of Fe2O3/PVDF-HFP porous film drove by flowing water

Journal of Hazardous Materials (2022)

Mengnan Chai Wangshu Tong Zhihao Wang Zhensheng Chen Yuan‐cheng An

Degradation

10.1016/j.jhazmat.2022.128446

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Effect of Electrical Stimulation Generated by Self-Powered Systems for Tissue Repair

Mengnan Chai Yufan Li Yubao Li Yi Zuo Jidong Li

Functional electrical stimulation

10.2139/ssrn.5120618

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Effective H₂O₂ Production via Favorable Intermediate Desorption in Fluctuating Electrical Fields from Matrix‐Filler Mutually Enhanced P‐C₃N₄/PVDF‐HFP Porous Composite**

ChemElectroChem (2022)

Zhensheng Chen Jialin Zhuang Chao Liu Mengnan Chai Shuting Zhang

Abstract Piezocatalysis is considered as an emerging alternative to the traditional anthraquinone oxidation process to produce hydrogen peroxide by directly converting mechanical energy into chemical energy. However, the development of low‐cost, recyclable piezocatalysts with excellent piezoelectric performance is highly desired but also challenging. Herein, phosphorous‐doped graphite phase carbon nitride (PCN) as a filler was added to polytetrafluoroethylene‐hexafluoropropylene (PVDF‐HFP), and this nonmetal composite film with porous structure and rich β phase shows enhanced piezoelectricity. The synergy effects of the matrix and filler in mutual promoting their catalytic‐relevant properties (piezoelectrical capacities and carrier densities) ensure high H 2 O 2 production up to 668.56 μmol ⋅ g cat −1 ⋅ h −1 . The randomly fluctuating electrical fields disturb the strong adsorption of the *OOH intermediate and promote its desorption and subsequently the production of H 2 O 2 . The composite film can be used multiple times and easily recycled. This work provides novel insights in the piezocatalytic processes and inspire the development of excellent piezocatalysts for practical peroxide production at the consuming locations.

Filler (materials)

10.1002/celc.202200124

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Citations (7)

Phase separation of a PVDF–HFP film on an ice substrate to achieve self-polarisation alignment

Nano Energy (2022)

Yu-Lun Liu Wangshu Tong Lingchao Wang Panpan Zhang Jiahe Zhang

Hexafluoropropylene

10.1016/j.nanoen.2022.108082

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Citations (22)

Piezocatalytic effect and mechanism of rGO/PVDF-HFP porous film driven by water flow