SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Haiqiang Zhang,Yue Pan,Chengzhong Deng,Zhuolun Niu,Ruoyu You,Chun Chen
Improving aircraft environmental control systems could reduce the risk of airborne infectious disease transmission in aircraft cabins. The high-efficiency particulate air (HEPA) filters used in the existing systems exhibit high pressure drop, which results in high consumption of energy and fuel. Nanofiber air filters fabricated by electrospinning can reduce pressure drop, but their performance in aircraft cabins is unknown. Therefore, this study experimentally investigated the interpersonal particle transport in an aircraft cabin mockup with nanofiber air filters. First, a full-scale, fully occupied, 7-row, single-aisle aircraft cabin mockup was constructed. Nanofiber filtration units were fabricated using the electrospinning technique. Under the well-sealed laboratory testing conditions, both the small-scale nanofiber and HEPA filter media exhibited a particle removal efficiency of around 99 %. The performance of nanofiber and HEPA filtration units installed in the environmental control system of the mockup was then measured. Finally, the interpersonal particle transport in the cabin was measured. The results show that the particle removal efficiency of the nanofiber filtration units installed in the environmental control system ranged from 64 to 72 % when the particle size was 0.3–0.4 μm, which primarily reflected the large air leakages associated with the filter installation. At the filter media level, the pressure drop across the nanofiber units in the mockup was 61–67 % lower than that across the HEPA units under the same airflow rate, which however may not necessarily translate into lower pressure drop for actual filters in aircraft due to the potentially different design in terms of media face area. The average normalized particle concentration in the breathing zones of fellow passengers in the cabin mockup with the nanofiber filtration units was by 0.23, 0.29, and 0.32, respectively, when the index passenger was seated at the window, middle, and aisle.
研究领域:
环境科学
·
公共卫生
·
航空航天工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Qian Jiang,Yuling Xie,Lingqian Ji,Zhaoxiang Zhong,Weihong Xing
The fabrication of porous silicon carbide (SiC) ceramics prepared by existing reaction bonding technology requires high-temperature sintering beyond 1400 °C. We used low-cost industrial grade water glass and zirconia as sintering aids to prepare porous SiC ceramic filters to reduce the sintering temperature while improving the commerciality. Additionally, we investigated the effects of different sintering temperatures and the addition of water glass on the samples. Loading water glass and zirconia reduced the sintering temperature to 600 °C. The additive-loaded ceramic filter sintered at 600 °C exhibited an average pore size of 0.58 μm, a porosity of 47.4%, a bending strength reaching 56 MPa, a pure water permeance exceeding 4800 L m −2 h −1 bar −1 , and good acid corrosion resistance . In addition, the SiC filter prepared at 1000 °C showed good chemical resistance and an average pore size of 0.75 μm as well as mechanical strength and pure water permeance of over 80 MPa and 6294 L m −2 h −1 bar −1 , respectively. The low-cost, high-performance porous SiC ceramic filter exhibits broad commercial application prospects in water treatment.
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
LANGMUIR
·
2025
·
IF 3.9
Yaqin Zhu,Gaigai Duan,Haoqi Yang,Jingquan Han,Xiaoshuai Han,Chunmei Zhang,Haimei Mao,Hongliang Zhao,Shuijian He,Shaohua Jiang
Antibiotic pollution is a crucial global environmental issue, and it is necessary to develop simple, economical, and effective filtration materials for the removal of antibiotics from water. Wood, a plentiful and ecofriendly natural material characterized by a hierarchical porous architecture, robust mechanical strength, and abundant functional groups, has been adopted as an adsorptive filter for water purification. However, the mechanism of natural wood filters for removing pollutants from water has not been analyzed. In this study, we prepared three wood filters (balsawood, basswood, and Chinese fir) with different pore structures for the removal of the tetracycline (TC) antibiotic. We systematically investigated the structures and properties of the three wood filters to establish clear structure–property-performance relationships. By comprehensively considering the flux and TC removal efficiency, we selected the basswood filter as the optimal filter and further discussed the removal efficiency of the basswood filter and its removal mechanism for TC. When using five basswood filters, after continuously treating 120 mL of 0.5 mg L–1 TC solution at 5000 L m–2 h–1, a relatively high removal efficiency of over 85% could still be achieved. The filters retained ∼80.5% of their removal efficiency after five regeneration cycles, demonstrating excellent reusability. The further studies prove that there are three primary interaction forms in the process of TC removal by the basswood filter, which are electrostatic interaction, hydrogen bonding interaction, and π-π interaction. This is expected to be widely applied in actual wastewater treatment.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Nian-Dan Zhao,Yan Wang,Xiao-Hang Zou,Wei-Ming Yin,Xin-Yu Wang,Yuan-Ru Guo,Qing-Jiang Pan
The utilization of renewable biomass cellulose in treating pollution of heavy metal ions (HMIs) is one of overarching and appealing strategies, because it simultaneously satisfies sustainable development and resolves ever-increasing environmental issue. In this regard, the composite cellulose@Mg(OH) 2 was prepared via a facile method and explored for its use as water treatment agent. It is demonstrated that the smaller and thinner hexagonal Mg(OH) 2 flakes are constructed onto the cellulose substrate by self-assembling; two components are chemically coupled via hydrogen bonds and Mg-O c (cellulose oxygen) dative bonds; what’s more, the coupling of cellulose with Mg(OH) 2 (1 0 1) facet is much more preferential than with (0 0 1) facet. The resultant composite material shows remarkable HMI removal performance: large capacities of 734.9, 595.8 and 1473.1 mg g −1 for Cd 2+ , Cu 2+ and Pb 2+ , respectively. Further assisted by good shaping property of the cellulose substrate, the composite is capable of being made into filter, which practically separates HMIs and purifies wastewater with high removal efficiency (99.99%) for Cd 2+ even after operating for 110 days and potable water can be obtained. The mechanism is delineated with removal models and characterizations of HMI-recovered products.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2021
·
IF 3.739
Chengwei Xu,Yan Yu,Xiaodong Si
The surface wettability of fibers in coalescing filter has a critical effect on filter’s performance. In this study, we employed common glass fiber filters as model and prepared superoleophilic and superoleophobic surface filters via a facile dip-coating method. The superoleophilic treatment shows a considerable reduction in pressure drop. The wet pressure drop at saturation decrease from 12.91 kPa to 8.56 kPa after superoleophilic coating. The filtration efficiency of fine particles (<100 nm) increase owing to coating treatment. The combinations of superoleophilic and superoleophobic filter and drainage strategy were also evaluated. The results show that the combination has no advantage due to emergency turn of wettability. The drainage layer with appropriate rank could enhance the drainage rate at unsaturation stage. However, the drainage strategy is never a good idea to improving coalescence performance because it brings the extra pressure drop.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
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
Small
·
2017
·Vol. 13
·期 46
·1702139
·
IF 8.643
Fenglei Zuo,Shichao Zhang,Hui Liu,Hao Fong,Xia Yin,Jianyong Yu,Bin Ding
The filtration performance and light transmittance of nanofiber air filters are restricted by their thick fiber diameter, large pore size, and substrate dependence, which can be solved by constructing substrate-free fibrous membranes with true nanoscale diameters and ultrathin thicknesses, however, it has proven to be extremely challenging. Herein, a roust approach is presented to create free-standing polyurethane (PU) nanofiber/nets air filters composed of bonded nanofibers and 2D nanonets for particular matter (PM) capture via combining electrospinning/netting technique and facile peel off process from designed substrates. This strategy causes widely distributed Steiner-tree structured nanonets with diameters of ≈20 nm and bonded scaffold nanofibers to assemble into ultrathin membranes with small pore size, high porosity, and robust mechanical strength on a large scale based on ionic liquid inspiration and surface structure optimization of receiver substrates. As a consequence, the resulting free-standing PU nanofiber/nets filters exhibit high PM 1–0.5 removal efficiency of >99.00% and PM 2.5–1 removal efficiency of >99.73%, maintaining high light transmittance of ≈70% and low pressure drop of 28 Pa; even achieve >99.97% removal efficiency with ≈40% transmittance for PM 0.3 filtration, and robust purification capacity for real smoke PM 2.5 , making them promising high-efficiency and transparent filtration materials for various filtration and separation applications.
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
JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Jiannan Sun,Shiwei Yang,Heyong Cheng,Yuanchao Wang,Jinhua Liu
Further development of capillary electrochromatography (CEC) is to some extent restricted by column technology. Packed capillary columns are most commonly used in CEC because of higher sample capacity and higher sensitivity than open tubular columns, and better reproducibility and uniformity than monolithic columns. Fritting is the core component for the fabrication of packed capillary columns. Therefore various fritting technologies attract continuous attention from analytical community. A convenient fritting method was developed in this study. In contrast to the reported single-particle fritting, this method applies a multi-particle fritting technology to hold stationary phase in capillary columns. Several large porous particles smaller than the column internal diameter were tapped in and immobilized in inlet and outlet of the packing material bed due to direct and indirect keystone effect. Except the smallest permeability by the sintered frit and the lowest breaking pressure by the single-particle frit, EOF mobility and peak dispersion of the multi-particle frit were at the same levels with the formers. In addition, all the three frits avoided bubble formation. It demonstrated that the multi-particle frits met the general requirements of permeability, mechanical resistance and efficiency for packing capillary microcolumns as well as the sintered frits and the single-particle frits. Thus, peak efficiency around 4.3 μm plate height (approximately 232,560 plates per meter) was obtained by multi-particle fritted capillary columns with electrokinetic packing, compared to 6.5 μm plate height by single-particle fritted columns with slurry pressure packing. In particular, the multi-particle fritting was simpler, faster, and more reproducible than the sintered fritting, and the multi-particle fritting was suitable to pack capillary columns of various capillary bore sizes owing to rich commercial resources of fritting particles of various diameters. Multi-particle fritted columns offered satisfactory run-to-run and column-to-column reproducibilities for retention factor, plate height and peak area (precisions of 4.1–9.3% for 10 replicated columns, and precisions of 0.9–3.1% for 30 replicated trials). They also had consistent CEC performance (differences of 1.1–3.9% between the first and 31 st day) during a lifetime more than one month. Application examples in packing capillary columns of 75 and 100 μm i.d. and CEC analysis of sixteen polycyclic aromatic hydrocarbons prove the diversity and reliability of the multi-particle fritting in column technology.
研究领域:
分析化学
·
分离科学
·
色谱技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Xiaoman Li,Suran Huang,Han Li,Haiming Huang
The pervasive presence of refractory organic pollutants and phosphorus(P) in wastewater has attracted great attention but lacks efficient treatment technology. Herein, we ingeniously designed FeS nanosheets decorated Fe foam(FFS) as a catalytic filter for the co-removal of organic pollutants and P. The hierarchical porous structure and highly exposed active sites of FFS composites enable high catalytic efficiency for the degradation of different organic pollutants(ciprofloxacin, levofloxacin, amoxicillin, etc.) via the activation of peroxymonosulfate(PMS), and the leached Fe ions removed phosphate simultaneously. 97.2 % ciprofloxacin(CIP) and 73.8 % P were removed synchronously from water within 40 min in the heterogeneous Fenton system(FFS-2/PMS). Scavenging experiments, EPR analysis, and electrochemical analysis results showed that CIP was oxidized into organic intermediates by •O 2 - , •OH, and SO 4 •- , and P was mainly removed by chemical precipitates of Fe(III)-P and adsorption. E.coli and cell survival tests verified the significant toxicity reduction after the reaction. Furthermore, the FFS-based catalytic filter can be engineered for continuous decontamination of combined pollution of P and organic pollutants. The removal rate of CIP and P reached > 90 % and > 80 % over 7 days. The work offers a paradigm for the treatment of multiple contaminants and shows the prospects of Fe foam-based materials for large-scale application water purification.
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
Materials Research Express
·
2020
·Vol. 7
·期 12
·125502
·
IF 1.929
Lei Zhao,Kun Li,Ruian Wu,Hua Zhang,Jiang Jin
The catalytic filter was fabricated by supporting selective catalytic reduction (SCR) catalyst on the low-density ceramic (LDC) for the removal of dust and nitrogen oxides (NOx) in the flue gases at relative low temperature. MnOx–ZrO2/TiO2 catalyst was selected as SCR catalyst. The NOx and dust removal efficiency, filter resistance, regeneration performance and anti-sulfur performance were investigated. The result showed that the NOx removal efficiency at 180°C reached 98.4% (1 m/min filtration velocity) for 6 wt% MnOx–ZrO2/TiO2 catalytic filter with Mn/Zr molar ratio of 2. Furthermore, MnOx–ZrO2/TiO2 catalytic filter performed good anti-sulfur performance. In the presence of 10 vol% water vapor and 100 ppm SO2 at 180 °C, the NOx removal efficiency for MnOx–ZrO2/TiO2 catalytic filter could retain up to 83.2% and it could recover to 91.8% when the water vapor and SO2 were cut off. MnOx–ZrO2/TiO2 catalytic filter showed the high dust removal efficiency of 99.99% and the low filter resistance of less than 200 Pa. The filter resistance of MnOx–ZrO2 /TiO2 catalytic filter could maintain 235.7 Pa after 200 times pulse blowback. The result illustrated that MnOx–ZrO2/TiO2 catalytic filter showed good regeneration performance.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Materials Today Physics
·
2024
·
IF 10
Chen Chen,Wenping Li,Shijun Xing,Junjie Yu,Qingxue Li,Ruizhen Hu,Lihong Liu,Jiazhi Yang,Qiaofeng Han
Air pollution has presented an imminent threat to the world. Multifunctional filters with high filtration efficiency, low pressure drop, moisture resistance, antibacterial properties, and renewability are urgently needed to be developed. In this study, multifunctional wood filters are innovatively designed with a baffle structure combining macroscopic structural design and microscopic in-situ synthesis of silver nanoparticles (Ag NPs). The filter has excellent particle removal efficiency (PM 0.3 , 98.5 %), exceptional volatile organic compounds (VOCs) adsorption efficiency (98.4 % for formaldehyde and 91.7 % for xylene), high sterilization efficiency (99.99 %) and excellent regeneration ability (performance recovery to 98 % of the initial). Furthermore, personal protective masks were assembled by the prepared filters, whose process of replacing element is as simple as replacement of electric mosquito incense tablets. This innovative filter holds promise for applications such as daily protection, sudden accidents and prevention and control of respiratory infectious diseases. We envision that the functionally modified Ag NPs wood filters with a multilayer structure offer a comprehensive solution for more effective air purification in polluted environment.
研究领域:
材料科学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 36
·18955-18962
·
IF 11.301
Hui Liu,Shichao Zhang,Lifang Liu,Jianyong Yu,Bin Ding
Two-dimensional (2D) networks assembled by nanoscale fibers are attractive for the design of equipment for personal and environmental protection, but are limited by insufficient structural and performance control. We report a facile route, based on blend electrospinning/netting technology, for the preparation of a hybrid biologically inspired nanofiber network (nanofiber-net) filter with nanoscale fiber diameters (∼27 nm), a 2D stable spider-web-like structure, and mussel-mimetic wet-adhesive surfaces. Manipulating the formation and phase separation of the charged droplets ejected from a Taylor cone by controlling the mussel-mimetic adhesive molecules, enabled the generation of biomimetic nanofiber-nets on a large scale. The resulting filters show the remarkable nanostructural properties of small pore size (∼0.28 μm), high specific area, enhanced surface adhesion and wettability, high-performance applications in air filtration (>99.99% PM0.3 efficiency under >90% humidity, ∼0.13% of atmosphere pressure) and water purification (>99.9% efficiency, 453 L m−2 h−1 gravity-driven flux). This work offers an innovative design of high-performance nanofiber filters for a broad range of applications.
研究领域:
材料科学
·
环境科学
·
生物仿生学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）