Zeolite imidazole framework-8(ZIF-8) decorated keratin-based air filters with formaldehyde removal and photocatalytic disinfection performance

Ni, Ruiyan; Xu, Hong; Ma, Jianqing; Lü, Qiang; Hu, Yong; Huang, Chen; Ke, Qinfei; Zhao, Yongsheng

doi:10.1016/j.mtchem.2021.100689

Cited by 17 publications

(20 citation statements)

References 45 publications

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“…The PLA@ZIF8 membrane filter also has certain antibacterial ability because of the photoinduced ROS generation and potential release of metal ions (Zn 2+ ) and organic ligands. As shown in Figure e, after polarization, the P-PLA@ZIF8 membrane filter has a high surface potential to enhance the electrostatic attraction of ultrafine particles and the interception of bacteria, − , resulting in a high contaminant particle removal performance and excellent antibacterial performance. A number of studies used MOF for antibacterial purposes, but the combination of MOF with electrostatic forces did not receive the attention it deserves.…”

Section: Resultsmentioning

confidence: 99%

Biodegradable MOFilters for Effective Air Filtration and Sterilization by Coupling MOF Functionalization and Mechanical Polarization of Fibrous Poly(lactic acid)

Zhu

Tang

et al. 2023

ACS Appl. Mater. Interfaces

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High-performance air filtration materials are important for addressing the airborne pollutants. Herein, we propose an unprecedented access to biodegradable poly(lactic acid) (PLA)-based MOFilters with excellent filtering performance and antibacterial activity. The fabrication involved a stepwise in situ growth of zeolitic imidazolate framework-8 (ZIF-8) crystals at the surface of microfibrous PLA membranes, followed by mechanical polarization under high pressure and low temperature (5 MPa, 40 °C) to trigger the ordered alignment of dipoles in PLA chains and ZIF-8. The unique structural features allowed these PLA-based MOFilters to achieve an exceptional combination of excellent tensile properties, high dielectric constant (up to 2.4 F/m), and enhanced surface potential as high as 4 kV. Arising from the remarkable surface activity and electrostatic adsorption effect, a significant increase (from over 12% to nearly 20%) in PM0.3 filtration efficiency was observed for the PLA-based MOFilters compared to that of pure PLA counterparts, with weak relation to the airflow velocities (10–85 L/min). Moreover, the air resistance was controlled at a considerably low level for all the MOFilters, that is, below 183 Pa even at 85 L/min. It is worth noting that distinct antibacterial properties were achieved for the MOFilters, as illustrated by the inhibitive rates of 87 and 100% against Escherichia coli and Staphylococcus aureus, respectively. The proposed concept of PLA-based MOFilters offers unprecedented multifunction integration, which may fuel the development of biodegradable versatile filters with high capturing and antibacterial performances yet desirable manufacturing feasibility.

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Section: Resultsmentioning

confidence: 99%

Biodegradable MOFilters for Effective Air Filtration and Sterilization by Coupling MOF Functionalization and Mechanical Polarization of Fibrous Poly(lactic acid)

Zhu

Tang

et al. 2023

ACS Appl. Mater. Interfaces

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“…ZIF-8 demonstrated its high activity in photocatalytic reactions like CO 2 reduction, E. coli inactivation as well as antibacterial capability with high structure stability. ,, The toxicity of ZIF-8 is very low and has been used for bioapplications. , Thus, ZIF-8 NPs were selected as the functional heterophases for air filtration/purification and antibacterial applications. For a smooth ZIF-8 electrospray, the ZIF-8 NPs are required to be predispersed in the solvent, which is also compatible with the HFP solvent that dissolves PLA/PHBR.…”

Section: Resultsmentioning

confidence: 99%

Electrospray-on-Electrospun Breathable, Biodegradable, and Robust Nanofibrous Membranes with Photocatalytic Bactericidal Activity

Lim

Yap

Teng

et al. 2023

ACS Appl. Nano Mater.

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The increasing emergence of infectious diseases like COVID-19 has created an urgent need for filtration/purification materials coupled with multifunctional features such as mechanical integrity, excellent airflow/filtration, and antibacterial/antimicrobial properties. Polymer membranes and metal−organic frameworks (MOFs) have demonstrated high effectiveness in air filtration and purification. MOF nanoparticles have been introduced into electrospun polymer nanofibrous membranes through embedding or postsolution growth. However, the derived hybrids are still facing the issue of (1) limited MOF exposure, which leads to low efficacy; and (2) uncontrollable growth, which leads to pore blocking and low breathability. In this work, we customized an electrospray-on-electrospinning in situ process to dynamically integrate MOF nanoparticles into a robust and elastic continuous nanofibrous membrane for advanced properties including high mechanical strength and flexibility, excellent breathability, particle filtration, and good antimicrobial performance. Biodegradable polylactic acid was reinforced by the poly(hydroxybutyrate)-di-poly(DLA-CL) x copolymer (PHBR) and used as an electrospinning matrix, while MOF nanoparticles were simultaneously electrically sprayed onto the nanofibers with easily controllable MOF loading. The MOF nanoparticles were homogeneously deposited onto nanofibers without clogging the pores in the membrane. The collision of PLA and MOF under the wet status during electrospinning and the hydrogen bonding through C� O and N−H bonds strengthen the affinity between PLA nanofibers and MOF nanoparticles. Because of these factors, the MOFincorporated PLA/PHBR nanofibrous membrane achieved over 95% particle filtration efficiency with enhanced mechanical properties while maintaining high breathability. Meanwhile, it exhibits excellent photocatalytic antibacterial performance, which is necessary to kill microbes. The electrospray-on-electrospinning in situ process provides an efficient and straightforward way to hybridize one-dimensional (1D) or two-dimensional (2D) nanomaterials into a continuous nanofibrous membrane with strong interaction and controllable loading. Upon integrating proper functionalities from the materials, the obtained hybrids are able to achieve multifunctionalities for various applications.

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“…[ 28 ] Meanwhile, the peaks at ≈934.7 and 955.3 eV occurred because of Cu 2+ 2p 3/2 and 2p 1/2 , grafted by C‐CuBTC. [ 33 ] Co (II) is the main form existing in the in situ‐grown ZIF67 crystals on chitosan fibers. Two main peaks at 780.9 and 796.6 eV, separated by ≈15 eV, are assigned to Co 2p 3/2 and Co 2p 1/2 , grafted on C‐ZIF67, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…However, in this study, C‐ZIF67 or C‐CuBTC showed large specific surface area owing to the uniform loading of MOF crystals on chitosan fibers; this specific surface area was significantly larger than that of the previously reported MOFs‐fiber composites. [ 33 ] The results of BET characterization suggested that C‐ZIF67 possessed a high specific surface area owing to the intrinsic high porosity superiority of ZIF67 crystals, implying that the ZIF67 crystals played a more significant role in increasing NO adsorption performance than C‐CuBTC.…”

Section: Resultsmentioning

confidence: 99%

Multi‐Functional Cu‐BTC and ZIF‐67 Grown Chitosan Air Filters for Efficient NO and Particular Matter Removal

Kim

2022

Macro Materials & Eng

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Zeolitic imidazolate framework-67 (ZIF67) or copper(II)-benzene-1,3,5tricarboxylate (CuBTC)-based chitosan fibers grown in situ on fibers can be used in the development of effective air filters. In this context, herein, metal-organic frameworks (ZIF67 or CuBTC) are grown in situ on chitosan fibers (denoted as C-ZIF67 or C-CuBTC), and the NO gas adsorption performance, particular matter filtration efficiency, and antibacterial properties of the fabricated materials against E. coli and S. epidermidis are investigated. The specific surface areas of C-ZIF67 and C-CuBTC are 311.9 and 140.1 m 2 g −1 , respectively, whereas that of the untreated chitosan fibers is 0.1 m 2 g −1 . For C-ZIF67, the NO adsorption efficiency rapidly increases up to 78%; specifically, 70% adsorption is maintained for 65 min. For C-CuBTC, the NO adsorption efficiency rapidly increases up to 54% initially and substantially decreases to 41% after 10 min. Furthermore, C-ZIF67 exhibits a 3.4 times higher NO adsorption capacity than that of C-CuBTC. For C-ZIF67 and C-CuBTC, the filtration efficiencies against PMs are higher than 99%. However, C-CuBTC shows a higher antibacterial activity (99.99%) against E. coli and S. epidermidis compared to C-ZIF67. The C-ZIF67 and C-CuBTC, derived from renewable resources, can be good alternatives for commercial synthetic air filters because they are biodegradable, cost-effective, and environment-friendly.

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Zeolite imidazole framework-8(ZIF-8) decorated keratin-based air filters with formaldehyde removal and photocatalytic disinfection performance

Cited by 17 publications

References 45 publications

Biodegradable MOFilters for Effective Air Filtration and Sterilization by Coupling MOF Functionalization and Mechanical Polarization of Fibrous Poly(lactic acid)

Biodegradable MOFilters for Effective Air Filtration and Sterilization by Coupling MOF Functionalization and Mechanical Polarization of Fibrous Poly(lactic acid)

Electrospray-on-Electrospun Breathable, Biodegradable, and Robust Nanofibrous Membranes with Photocatalytic Bactericidal Activity

Multi‐Functional Cu‐BTC and ZIF‐67 Grown Chitosan Air Filters for Efficient NO and Particular Matter Removal

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