RSC Advances
·
2018
·Vol. 8
·期 55
·31471-31477
·
IF 2.936
Yongyong Zhang,Ying Jia,Li'an Hou
Zeolitic imidazolate framework-8 (ZIF-8) was introduced on the surface of fibers of a non-woven fabric made of polyethylene terephthalate (PET). The phase structure, morphology, textural properties and chemical structure were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen (N2) adsorption analyzer and Fourier transform infrared spectroscopy (FTIR). The XRD, SEM and FTIR results indicated that ZIF-8 had been successfully coated on the PET fibers. N2 adsorption analyses suggested that addition of ZIF-8 significantly increased the specific surface and micropore volume of composites. The PM2.5 removal experiment showed the filtration efficiency of ZIF-8/PET was twice as high as that of pure PET. Meanwhile, ZIF-8/PET also displayed a low pressure drop and good recycling performance. This research provided a facile method to deposit active ZIF-8 onto polymers with low air resistance, and that ZIF-8/PET was a good candidate as an air filter for PM2.5 removal.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Yipeng Liang,Zhupeng Zhang,Enfu Wang,Yu Miao,Kuichuan Sheng,Siqun Wang,Weimiao Lu,Wenbiao Zhang,Jingda Huang
Chitosan (CS) based sponge shows important potential applications in adsorption, filtration, sensing, etc., which often requires good deformation-recovery ability that is usually achieved under the help of silane elastomers. Herein, a simple but innovative strategy was proposed that only bamboo activated carbon (BAC) was employed as the reinforcer to construct highly elastic phosphorylated chitosan (P-CS) sponge with through-hole structure like layer-support by freeze drying. In the system, the through-hole structure like layer-support was formed by directional freezing, where BAC as the “support” was fixed onto the P-CS “layer”. When the through h-hole structure like layer-support is squeezed, the “support” could limit the bending of the “layer” and protect it to some extent. Therefore, the resulting P-CS/BAC composite sponge displays excellent elastic properties. Based on the through-hole structure, the P-CS/BAC composite sponge is well suited for PM2.5 filtration, achieving a filtration efficiency of 99.61 % and a low pressure drop of only 60 Pa. Besides, it has excellent flame retardance (LOI of 50.4 %) due to the synergistic effect of N and P of P-CS. The system could achieve highly elastic without any silane, meanwhile, its simple preparation and excellent performance endow it a great development prospect in air purification.
研究领域:
材料科学
·
环境科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANO LETTERS
·
2017
·
IF 12.712
Bilal Khalid,Xiaopeng Bai,Hehe Wei,Ya Huang,Hui Wu,Yi Cui
Particulate matter (PM) pollution has caused many serious public health issues. Whereas indoor air protection usually relies on expensive and energy-consuming filtering devices, direct PM filtration by window screens has attracted increasing attention. Recently, electrospun polymer nanofiber networks have been developed as transparent filters for highly efficient PM2.5 removal; however, it remains challenging to uniformly coat the nanofibers on window screens on a large scale and with low cost. Here, we report a blow-spinning technique that is fast, efficient, and free of high voltages for the large-scale direct coating of nanofibers onto window screens for indoor PM pollution protection. We have achieved a transparent air filter of 80% optical transparency with >99% standard removal efficiency level for PM2.5. A test on a real window (1 m × 2 m) in Beijing has proven that the nanofiber transparent air filter acquires excellent PM2.5 removal efficiency of 90.6% over 12 h under extremely hazy air conditions (PM2.5 mass concentration > 708 μg/m3). Moreover, we show that the nanofibers can be readily coated on the window screen for pollution protection and can be easily removed by wiping the screen after hazardous days.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Xue Yang,Yi Pu,Yifei Zhang,Xiaofang Liu,Jianxin Li,Ding Yuan,Xin Ning
In this study, a new barium titanate@polyurethane/polysulfonamide (BaTiO 3 @PU/PSA) composite nanofibrous membrane with comprehensive properties for high temperature filtration and robust PM2.5 removal was successfully fabricated through the blending spinning of PU and PSA and the introduction of BaTiO 3 . As a consequence, the BaTiO 3 @PU/PSA membrane achieved the high capture efficiency of 99.99 % for fine particulates, low pressure drop of 39.4 ± 0.2 Pa, good mechanical property (13.27 MPa), sufficient flexibility, high thermal stability (up to 300 °C), favorable flame-retardancy as well as superior chemical resistance against acid and alkali. Especially, to intuitively reveal the relationship between the fiber structure, high temperature environment, gas velocity and filtration performance of the composite membrane, the filtration processes were carefully investigated through the analog simulation. More importantly, the BaTiO 3 @PU/PSA membrane exhibited high-efficiency PM2.5 purification capacity, and the removal efficiency kept stable after high temperature, acid or alkali treatment, ascribing to the advantageous structure of PSA, PU and BaTiO 3 . Overall, the BaTiO 3 @PU/PSA nanofiber membranes with versatility are a promising high-efficiency candidate for dust removal, particularly in harsh conditions.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yu Miao,Haichao Xu,Enfu Wang,Yipeng Liang,Zepeng Wang,Kuichuan Sheng,Chunping Dai,Wenbiao Zhang,Jingda Huang
It is unquestionably a great challenge to develop elastic cellulose nanofibril (CNF) based aerogels satisfying both excellent oil-water separation and efficient PM2.5 removal. In this work, the CNF based aerogel with a layer-support structure was design through CNF as the aerogel scaffold and compositing with bamboo activated charcoal (BAC) and Fe 3 O 4 as the functional particles, followed by hydrophobic modification. The resultant aerogel displays ultra-low density (30.12 mg/cm 3 ), good specific surface area (25.38 m 2 /g), magnetism (9.44 emu/g) and superhydrophobicity (water contact angle (WCA) of 153.8° and slide angle (SA) of 7°). Benefiting from high internal porosity of the layer-support structure, the system shows excellent absorption efficiency (16.79–51.93 g/g) for various oils and filtration efficiency (97.85 ± 1.2%) for PM2.5 with a low pressure drop (58 Pa). As well as it also shows outstanding mechanical properties and able to maintain a high recovery of 75.4% at 50% strain (corresponding 25.29 kPa) due to the flexibility of the “support” structure given by methyltrimethoxysilane (MTMS). Based on its simple preparation and excellent properties, the magnetic and superhydrophobic CNF/Fe 3 O 4 @BAC composite aerogel shows great potential in multifaceted separation technique and recycling of natural resources.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Yingchun Su,Zhijia Zhang,Zegao Wang,Menglin Chen,Mingdong Dong,Xiaojun Han
The necklace-like fiber membranes are fabricated using electrospinning technique for high-efficiency PM (particulate matter) capture. Poly- N , N ′-[(4,5-dihydroxy-1,2 phenylene)bis(methylene)]bisacrylamide (POHABA) nanospheres as “pearls” are embedded in poly(ethylene oxide) (PEO) and poly(vinylpyrrolidone) (PVP) matrix substrates to make necklace-like fibers. The reason for choosing POHABA nanospheres is due to their broad-spectrum inhibitory effect on bacteria. The diameters of three POHABA nanospheres are controlled to be 190 ± 50, 364 ± 39 and 467 ± 65 nm, respectively. The necklace-like structures become more pronounced with the increase of POHABA diameter. The PM 2.5 removal efficiencies of PEO necklace-like fiber membranes obtained with electrospinning time of half an hour are in the range from 88.0 to 92.5%. Under the same fabrication conditions, the PEO/POHABA-467 fiber membrane displays better capture efficiency than that of PVP/POHABA-467 fiber membrane. Using thicker PEO/POHABA-467 filter membrane (electrospinning for one hour), excellent removal efficiency of PM 2.5 (99.2%) is achieved, which is better than that obtained from other membranes and even commercial QMA filter (Whatman). The necklace-like fiber membranes have a great potential in the fields of aero filter and mask.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Mengyan Chen,Jiayu Jiang,Shasha Feng,Ze-Xian Low,Zhaoxiang Zhong,Weihong Xing
The functionalization of nanofibrous membranes (NFMs) is a prevailing and promising strategy to prepare highly efficient air filters for high-precision filtration. Graphene oxide (GO), due to its functional chemical groups, high mechanical properties , electrical conductivity , and excellent compatibility, has been widely applied in modification of polymer materials. In this work, two-dimensional graphene oxide (GO) nanosheets are introduced into PVDF NFMs through the use of the GO/PVDF blending-electrospinning and GO@PVDF surface coating methods to prepare a highly efficient air filter, respectively. Different GO loadings lead to NFMs with diverse surface properties, static electricity, nanofiber diameters, and air filtration performances. The basic properties, filtration performance and effects of the GO loading strategies of the optimized GO/PVDF and GO@PVDF NFMs are systematically compared and analyzed. In general, blending GO in a PVDF solution before electrospinning may significantly enhance the spinnability and static electricity. Meanwhile, GO with lamellar structure is of great benefit to provide the nucleation basis for β-PVDF, which can significantly endow the membrane with good particle capture capacity. The obtained GO/PVDF NFMs show a higher PM 2.5 removal efficiency of 99.31% and better reusability than the pristine PVDF NFMs (93.74%) and GO@PVDF NFMs (95.41%). This work reveals that blending GO in an electrospinning solution is a practical modification technique to prepare a high-efficiency air cleaning membrane.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Industrial Textiles
·
2022
·
IF 2.926
Yang Lei,Rong-Rong Cai,Rui-Qi Lin,Li-Zhi Zhang
Face masks are commonly used to protect an individual’s respiratory system from inhaling fine particulate matter (PM2.5) in polluted air, as well as the airborne pathogens, especially during the ongoing coronavirus disease 2019 (COVID-19) pandemic. However, all conventional masks with anti-PM2.5 function suffer from insufficient facial thermal comfort, particularly in a hot and humid environment. Herein, we demonstrated a novel infrared-transmittance visible-opaque PM2.5 media for radiative cooling utilizing rutile titanium dioxide particle-embedded polyamide 6 (PA6-TiO2). The transmission of visible light and infrared and PM2.5 removal performance of composite media containing a variety of microstructures, such as TiO2 particles of varying sizes, shapes, and contents, were numerically examined to determine the optimal ranges. Then the PA6-TiO2 media was effectively electrospun by controlling the arrangement of fibers and the morphology of TiO2 particles. By transmitting more than 85% of the thermal radiation from the human body and selectively blocking solar irradiance, the developed PA6-TiO2(flower-shaped) media cooled the simulative skin by 10.3°C as compared with commercial masks under strong solar irradiance. Additionally, they demonstrated a high PM2.5 removal efficiency of 95.3%, a low air resistance of 22.5 Pa (at 5.3 cm/s), and a sound water vapor transmission rate of 0.0169 g cm−2 h−1. This study presents an effective strategy for making thermally comfortable anti-PM2.5 masks, which will significantly benefit the public health prevention and control.
研究领域:
材料科学
·
环境科学
·
公共卫生
✓ 已验证
产品关联
DOI
高影响因子
BUILDING AND ENVIRONMENT
·
2020
·
IF 4.971
Tongling Xia,Chun Chen
Nanofiber filter media can potentially reduce exposure to PM 2.5 in indoor environments because of the filters’ high particle-removal efficiency. To facilitate such filter use, this study conducted a series of experiments to understand the evolution of wetting liquid aerosols, taking incense particles as an example, on nanofiber filter media and the influence of this evolution on PM 2.5 removal efficiency and pressure drop. Scanning electron microscope images were also taken to observe the nanoscale interactions between incense particles and the nanofiber network. The results show that the PM 2.5 removal efficiency at first decreased as the loading mass increased, because interactions between the particles and the nanofiber network enlarged the pores. The evolution of pressure drop may consist of two stages, i.e., a first stage with a linear relationship, and a second stage with a steep increase in pressure drop with the loading mass. When the pore size became small enough, in addition to inertial impaction and Brownian diffusion , the capture mechanism of interception also became significant. Consequently, the second stage, with a steep increase, tended to occur. Finally, methods for establishing empirical equations for PM 2.5 removal efficiency and pressure drop as a function of loading mass were proposed.
研究领域:
环境科学
·
材料科学
·
空气污染控制
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Luyun Xue,Xianbo Yang,Nan Wu,Meng Shao,Jin Wang,Yihuan Peng,Yafang Li,Xupin Zhuang
The growing threat of airborne particulate matter and pathogenic microorganisms to public health necessitates advanced air purification technologies capable of simultaneously removing particles and inactivating pathogens. In this study, we present a composite air filter based on a copper nanowire-modified phenolic resin meltblown nonwoven mat (CuNWs-PRMBM), which integrates physical filtration with Joule heating-induced sterilization. The PRMBM substrate, fabricated via melt-blowing, exhibits excellent thermal stability (decomposition temperature >450 °C) and low thermal conductivity (0.0369 W/m·K), offering a robust platform for Joule heating applications. Surface-deposited copper nanowires establish an efficient conductive network, enabling rapid (≤10 s) and uniform heating up to 124.6 °C under a low voltage of 3.0 V, with exceptional cycling stability. The composite displays superior filtration efficiency, achieving 99.6 % PM 2 . 5 removal at a low pressure drop of 87 Pa under 32 L·min −1 airflow, and maintains 94.9 % efficiency even at 85 L·min −1 . Furthermore, at 2.5 V (102.6 °C), the filter achieves complete inactivation of both S. aureus and E. coli within 15 min. Long-term tests confirm consistent performance over 120 h with sustained removal efficiencies exceeding 99.7 %. This work demonstrates a practical strategy for developing energy-efficient and safe air purification systems suitable for air purifiers and heating, ventilation, and air conditioning applications.
研究领域:
生物医学工程
·
环境科学
·
材料科学
·
公共卫生
·
空气净化技术
✓ 已验证
产品关联
DOI
高影响因子
BUILDING AND ENVIRONMENT
·
2019
·
IF 4.82
Ye Bian,Shijie Wang,Li Zhang,Chun Chen
Electrospinning is a versatile technique to fabricate nanofiber filters with high PM 2.5 removal efficiency and relatively low pressure drop. The eletrospun nanofiber filters may therefore be applied in buildings to reduce indoor exposure to PM 2.5 and the associated adverse health effects . This study investigated the influence of various filter parameters, including fiber diameter , filter thickness, and packing density, on the PM 2.5 removal efficiency. In this work, 25 nylon electrospun nanofiber filters with different filter parameters were prepared, and the PM 2.5 removal efficiency of each sample was measured at five different face velocities. In total, 125 sets of measured data were obtained. The results show that the PM 2.5 removal efficiency of nylon electrospun nanofiber filters was negatively associated with the fiber diameter, and positively associated with the thickness of the filter. However, there was no clear correlation between PM 2.5 removal efficiency and packing density. This investigation further developed a semi-empirical model for predicting the PM 2.5 removal efficiency of nylon nanofiber filters. The accuracy of the model was satisfactory with a median relative error of 7.9%.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Jiaxin Cui,Tao Lu,Fanghua Li,Yulin Wang,Jiandu Lei,Wenjing Ma,Yan Zou,Chaobo Huang
Air particulate pollution from ever-increasing industrialization poses an enormous threat to public health. Thus, the development of a green air filter with high efficiency and performance is of urgent necessity. In this study, we introduce a new effective air filtration membrane that can be used for outdoor protection. The air filter’s composite nanofibre materials were prepared from polyvinyl alcohol (PVA)-sodium lignosulfonate (LS) via a “green” electrospinning method and thermal crosslinking. The addition of LS helped increase the PM 2.5 removal efficiency compared to that of a pure PVA nanofibre membrane. The pressure drops of the electrospun PVA-LS membranes exceeded those of the pristine PVA air filter. The remarkable air filtration performance was maintained even after 10 cycles of circulation filtration. In addition, the PVA-LS composite nanofibre membrane exhibited excellent mechanical properties and transparency due to the introduction of LS. This study provides new insight into the design and development of high-performance and high-visibility green filter media, which include personal protection and building screens.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）