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
ATMOSPHERIC ENVIRONMENT
·
2022
·
IF 5.755
Jingrong He,Li Li,Yunxiang Li,Mei Huang,Ying Zhu,Shihuai Deng
In this work, six aromatic organosulfates (phenyl, 2-/3-/4-methylphenyl, benzyl and phenethyl sulfates) were synthesized, with the purpose to obtain the standards and apply them to quantify the organosulfates in ambient aerosols. The purity of the synthesized organosulfates was determined by high performance liquid chromatography/ultraviolet detector (HPLC/UV). Meanwhile, the organosulfate standards and atmospheric PM 2.5 samples were measured by high performance liquid chromatography/electrospray ionization/tandem mass spectrometry (HPLC/ESI/MS/MS). The characteristic ion fragments were phenolate anion m/z 93 for phenyl sulfate, creylate anion m/z 107 for methylphenyl sulfate, sulfate radical anion ·SO 4 − ( m/z 96) for benzyl sulfate, and hydrogen sulfate anion HSO 4 − ( m/z 97) for phenethyl sulfate. The characteristic fragment ions used for quantification can improve the identification of target compounds in chromatograms, obtain lower detection limits, and will minimize analytical errors caused by the introduction of surrogates. The concentrations of phenyl, methylphenyl, benzyl and phenethyl sulfates in winter PM 2.5 in Wenjiang District of Chengdu were 0.58 ± 0.56, 2.37 ± 3.59, 1.79 ± 3.51, 0.04 ± 0.08 ng/m 3 , respectively.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ATMOSPHERIC ENVIRONMENT
·
2019
·
IF 4.012
Changkun Xie,Lubing Yan,Anze Liang,Shengquan Che
The PM on plant surface being washed into soil during the rain is one of the key processes for plants to reduce atmospheric PM . This study attempted to explore the PM 2.5 washoff processes from different tree leaves during rain events (<16 mm/h) using an artificial rainfall simulation experiment. We aimed to improve our knowledge of processes associated with PM 2.5 reduction and to provide a basis for accurately evaluating the ability of plants to reduce PM 2.5 . This is the first study showing that the PM 2.5 washoff processes from leaves follow quartic functions and 4 pattern curves under different conditions were categorized. They respectively explained the PM 2.5 washoff processes in broad-leaved trees with large leaves and simple crowns (bimodal curved), in conifer species with small leaves and complex crowns under high rainfall intensity (unimodal curved), in trees with extremely complex crowns under high rainfall intensity (continually-rising curved), and in conditions under which extremely high water interception efficiency but rather low water storage capacity occur (U-shaped curved). These curves indicate that the amount of PM 2.5 on leaves was not necessarily reduced in rainfall events. The general ranking of the average values of PM 2.5 number on leaves surface during rain events was Cedrus Deodara (40.3 × 10 3 /cm 2 ), Japanese Maple (33.0 × 10 3 /cm 2 ) > Dragon Juniper (14.7 × 10 3 /cm 2 ), Dawn Redwood (12.6 × 10 3 /cm 2 ) > Common Boxwood (6.4 × 10 3 /cm 2 ), Lotus Magnolia (4.1 × 10 3 /cm 2 ). The cycles of PM 2.5 accumulation and removal on broad-leaved trees might be shorter than that of conifers, meaning that they may have a better PM 2.5 washoff efficiency during rain, which is opposite to the PM 2.5 deposition efficiency. Higher rainfall intensity can reduce the cycle length and enhance the PM 2.5 washoff efficiency.
研究领域:
生态学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Yanhao Zhang,Zifang Peng,Peiru Luo,Lin Zhu,Qingyun He,Congcong Pei,Dan Yin,Wenfen Zhang,Shusheng Zhang,Zongwei Cai
The broad application of various pesticides guarantees the development of agriculture all over the word but has ultimately led to their ubiquitous release into the environment as hazardous chemical residues. Diamide insecticides (DAIs) are regarded as new choice for prevention and protection of agricultural crops and city landscaping plants from the pests in more and more countries. However, their presence in fine particulate matter (PM 2.5 ) and associated health risks have not been studied. We reported for the first time the extensive distributions of PM 2.5 -bound DAIs in rural and urban areas of China, one of the world’s largest agricultural countries. Eight DAIs were analyzed, and five were consistently detected in PM 2.5 samples at concentrations primarily of pg m −3 level. Evident spatial/temporal variations were observed, with generally more serious DAIs’ contamination and long-term health risks in rural areas during spring, summer and autumn. The first exploration of DAIs’ toxicities on human bronchial epithelial cells discovered their capability of inhibiting cell viabilities, further demonstrating the potential detrimental effects of these emerging pollutants in PM 2.5 . This study confirms the widespread appearance of DAIs in PM 2.5 , emphasizing the need and urgency for concern about their pollution in both rural and urban air.
研究领域:
环境科学
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毒理学
·
公共卫生
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES COMMUNICATIONS
·
2020
·
IF 4.915
Andong Zhang,Heping Li,Aohua Zhang,Jun Zhou,Youwei Yan
Polymer nanofibers have a great potential in PM 2.5 filtration, but they generally cannot remove particulate matter (PM) particles directly from high-temperature sources due to their vulnerable structure. Polysulfonamide (PSA)/polyacrylonitrile (PAN) composite nanofibers that can withstand a temperature up to 400 °C, were fabricated by a simple electrospinning method. The interactions between PSA and PAN defined the resulting microarchitecture and shape of the nanofibers when suffering heating. The PSA/PAN composite nanofibers exhibited above 99.7% removal efficiency for the PM 2.5 . More importantly, such a high PM 2.5 removal efficiency was well retained even after heating the nanofibers at temperatures ranging between 100 °C and 400 °C. The nanofiber air filter could continuously work for 100 h in an environment with the concentration of PM 2.5 approaching 380 μg/m 3 . The good thermal stability and high filtration efficiency of PSA/PAN nanofibers make them attractive in various applications, especially when high-temperature bearable polymer components are needed.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Hengzhang Dai,Xuan Liu,Chaoran Zhang,Kuang Ma,Yafei Zhang
Particulate matter (PM) pollution can severely affect human health. Currently, the most dangerous air pollutant is PM 2.5 which refers to particles with a diameter less than 2.5 μm. In order to mitigate the detrimental effects of PM 2.5 , there is an urgent demand for an air filter with improved performance. In this study, graphene oxide (GO), polyacrylonitrile (PAN), and polyimide (PI) are combined to prepare PAN/GO/PI nanofibrous membranes for efficient air filtration via electrospinning. The as-prepared PAN/GO/PI-6 nanofibrous membranes demonstrate high filtration efficiency (99.5%), low pressure drop (92 Pa), remarkable thermal stability (300 °C), and excellent mechanical strength. Built upon the above merits, this kind of nanofibrous membrane can account for widespread utilization in both industrial applications and civil health warrants.
研究领域:
材料科学
·
环境科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Xiu Dai,Xu Li,Xinlong Wang
In this work, the nanoparticles of zeolitic imidazolate framework-8 (ZIF-8) are incorporated into poly (lactic acid) (PLA) to prepare porous electrospun membranes. The morphology, mechanical property as well as the PM capture process and capacity of the membranes are studied using scanning electron microscopy (SEM), BET test, X-ray diffraction (XRD), tensile test, Fourier infrared spectra (FT-IR), UV–visible spectra, thermogravimetric analyses (TGA) and photoelectron spectroscope (XPS), systematically. The results demonstrate that the diameter and nanoscale porous structure of fibres can be successfully controlled by changing the content ZIF-8. The PLA/ZIF-8 membranes show better mechanical property compared with pure PLA membrane. The PM capture measurement demonstrates that the PLA/ZIF-8 porous membranes exhibit significantly enhanced PM2.5 removal efficiency compared to that of the pure PLA membrane. The prepared porous membranes also show low pressure drops and good recycling performance.
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
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Shan Huang,Qicong Song,Weiwei Hu,Bin Yuan,Junwen Liu,Bin Jiang,Wei Li,Caihong Wu,Fan Jiang,Wei Chen,Xinming Wang,Min Shao
Atmospheric amines have attracted increasing attention due to their significant impact on new particle formation, particle hygroscopicity and particle optical properties . In this study, four low-molecule-weight amines were detected from PM 2.5 filter samples collected at an urban site of Pearl River Delta (PRD) region of China in 2018 autumn. During the campaign, the mass concentrations of ambient particulate methylamine (MA, CH 3 NH 2 ), dimethylamine (DMA, (CH 3 ) 2 NH), trimethylamine (TMA, (CH 3 ) 3 N), and diethylamine (DEA, (C 2 H 5 ) 2 NH) were quantified at daily or 12-h resolution using an optimized Ion Chromatograph (IC) method. The total measured amine concentration was 297 ± 209 ng/m 3 , which can account for 0.76 ± 0.33% of PM 2.5 mass concentrations. The particulate amines in PRD urban area were dominated by MA (243 ± 179 ng/m 3 ), accounting for over 80% of total amines, then followed by DMA (49 ± 30 ng/m 3 , 16.5%), TMA (4 ± 2 ng/m 3 ) and DEA (1 ± 1 ng/m 3 ). Based on the correlation analysis, MA and DMA mainly presented as nitrate and sulfate salts. We speculate the amines tend to react with gas-phase HNO 3 or particle-phase nitrate to form particulate amine salts via local process in Guangzhou. As the relative humidity (RH) increased, enhanced partitioning of amine towards the particle phase was observed. Using approach of multiple linear regression, 71% of the particulate amines in PRD urban site could be explained by acid-base process and the rest by primary emissions from combustion sources (29%).
研究领域:
环境科学
·
大气化学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 24
·16828-16834
·
IF 3.9
Hangdong Chen,Xun Sun,Ying Wang,Lixian Shi,Xuan Liu,Nantao Hu
Particulate air pollution is a global environmental problem, with PM2.5 being the primary pollutant. One of the most effective ways to remove particles from the air is through filtration. Therefore, high-performance air filters are urgently needed to combat the harm caused by PM2.5. This study uses an electrospinning technique to prepare high-efficiency polyvinylidene fluoride/graphene oxide/polyimide nanofiber membranes. These composite nanofiber membranes demonstrate high filtration efficiency (99.6%), low pressure drop (123 Pa), remarkable thermal stability (450 °C), and excellent mechanical strength (7 MPa). Considering the advantages, these highly efficient nanofiber membranes can find advanced applications in industrial and civil infrastructures.
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
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Rong-Rong Cai,Shu-Zheng Li,Li-Zhi Zhang,Yang Lei
Airborne particulate matter (PM) pollution has raised serious concerns over both the global climate and public health. Therefore, there is an urgent need for air filters of high-efficiency and energy-saving. Pore structure optimization and electret enhancement are feasible means to improve their filtration performance. Herein, a novel sandwich-structured electret composite filter with a low pressure drop and robust filtration stability was successfully designed and fabricated. The composite filter was composed of fluffy PS microfibers with large electric resistivity and high porosity, and PAN nanofibers with high polarity and small pore size. Benefiting from the fluffy structure constructed by electrospinning at the right humidity, the tortuous pore channels created by the appropriate mixing of microfibers and nanofibers, and the abundant static charges generated by the hybrid of polar and nonpolar polymer materials, the PS/PAN/PS composite filter possessed a high filtration efficiency of 99.96% for particles of 0.30 μm, a low pressure drop of 54 Pa and a satisfactory quality factor value of 0.1449 Pa −1 at an airflow velocity of 5.3 cm/s. In particular, the composite filter exhibited better electret stability and PM 2.5 loading performance than the commercial ones, which guarantees its long-term storage and usage.
研究领域:
环境科学
·
材料科学
·
纳米技术
·
空气净化技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Hao Chang,Xi Zhang,Zhonghua Lu,Biling Gao,Heqing Shen
Many environmental toxicants can cause systemic effects, such as fine particulate matter (PM 2.5 ), which can penetrate the respiratory barrier and induce effects in multiple tissues. Although metabolomics has been used to identify biomarkers for PM 2.5 , its multi-tissue toxicology has not yet been explored holistically. Our objective is to explore PM 2.5 induced metabolic alterations and unveil the intra-tissue responses along with inter-tissue communicational effects. In this study, following a single intratracheal instillation of multiple doses (0, 25, and 150 μg as the control, low, and high dose), non-targeted metabolomics was employed to evaluate the metabolic impact of PM 2.5 across multiple tissues. PM 2.5 induced tissue-specific and dose-dependent disturbances of metabolites and their pathways. The remarkable increase of both intra- and inter-tissue correlations was observed, with emphasis on the metabolism connectivity among lung, spleen, and heart; the tissues’ functional specificity has marked their toxic modes. Beyond the inter-status comparison of the metabolite fold-changes, the current correlation network built on intra-status can offer additional insights into how the multiple tissues and their metabolites coordinately change in response to external stimuli such as PM 2.5 exposure.
研究领域:
环境科学
·
毒理学
·
代谢组学
✓ 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
危险品化学品经营许可证（带存储）