RSC Advances
·
2016
·Vol. 6
·期 88
·85545-85550
·
IF 3.289
Zhiqiang Cheng,Yingying Zhang,Zhaolian Han,Liying Cui,Lijuan Kang,Fanli Zhang
A novel 3D filtration medium for airborne particles was prepared using an electrospinning technique, wherein PVA and PAN were used as a reinforcing agent and a bulk material for the filtration membrane, respectively. In order to improve the filtration efficiency and mechanical property of the membrane, the membrane was modified by a certain concentration mixture of GA, acetone and acetic acid, which could reduce the number of hydroxyl groups, promote its stability and increase the compactness via a bond between fibers. Simultaneously, the mechanical property of the membrane was measured by a tensile tester, and the results demonstrated that the maximum strain and toughness reached 144.58% and 5.33 J g−1, respectively. After that, the membrane was used as an air purification material for testing air particles content and the particles intercept principle has been discussed. The filtration performance of the membrane demonstrated that the membrane possessed excellent removing efficiency for air suspension with lower pressure drop compared with commercial masks under the same testing conditions. The filtration efficiency for the particles, sized 0.3 to 7 μm, was found to be approximately 99%. Furthermore, we also developed an effective avenue to fabricate a filtration medium based on the a steel wire for applications in ultra condition.
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
CHEMOSPHERE
·
2018
·
IF 4.427
Peng Liu,Xiangyu Wang,Jun Ma,Huiling Liu,Ping Ning
To provide superior substrates and determine the specific species of immobilized nano zero-valent iron (NZVI) system, polyacrylonitrile (PAN) membrane was functionalized by bio-inspired polydopamine (PDA) and poly( l -DOPA) (PDOPA) for efficient immobilization of NZVI. The synthesized composites were denoted as PAN/PDA-NZVI (PPN) and PAN/PDOPA-NZVI (PON), respectively. Analyses of XRD, SEM/EDS and XPS show that the aggregation and release of iron nanoparticles had been successfully controlled by improving membrane hydrophilcity and iron-chelating capacity via the graft of functionalized groups (i.e. OH and COOH) of PDA and PDOPA on PAN membrane. Both PPN and PON composites exhibited superior reactivity for Cr(VI) removal (Cr(VI) removal efficiency and reaction rate were 2.21–2.22 and 9.90–10.14 times higher than that of bare NZVI, respectively). The stability and recyclability of PPN and PON composites could be maintained over repeated cycles. Further analyses indicate that PON is more capable for Cr(VI) elimination than PPN due to the proprietary carboxyl of l -DOPA. With the addition of 1,10-phenanthroline, membrane-chelated Fe(II) was determined to be the major species in Cr(VI) removal system, accounting for 56.9% and 53.8% with regard to PPN and PON composites, and Fe 0 was responsible for the reduction of residual Cr(VI). Analyse of reacted composites revealed that Cr(VI) was completely converted into Cr(III), followed by formation of dominant Cr(III)/Fe(III) (oxy)hydroxides and partial desorption from NZVI reactive sites. This study suggested that both synthesized PPN and PON composites have potentials for Cr(VI)-contaminated wastewater treatment .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
IONICS
·
2023
·Vol. 29
·期 11
·4669-4679
·
IF 2.8
Tang Liping,Wu Yankang,Lei Zhiqiang,He Yu,Chen Jian
An in situ–grown TiO 2 membrane was prepared by an electrospinning method using polyacrylonitrile as the spinning precursor, combined with the TiO 2 hydrolysis mechanism. The performance of tetrabutyl titanate and isopropyl titanate as two titanium source precursors hydrolyzed under the inhibition of acrylic acid to produce TiO 2 with different contents for lithium-ion batteries was compared. The experimental results showed that when both titanium sources were prepared at 3 wt%, the comprehensive performance of the separator manufactured with tetrabutyl titanate as the titanium source (PAN/TBT-3) and isopropyl titanate as the titanium source (PAN/TPT-3) was finest than that of the Celgard 2400 and the composite membrane with direct TiO 2 addition (PAN/TiO 2 -3). The tensile strength of PAN/TPT-3 and PAN/TBT-3 membranes were 7.82 MPa and 4.03 MPa higher than that of Celgard 2400, and 17.03 MPa and 13.29 MPa higher than that of PAN/TiO 2 -3 separator, respectively. PAN/TPT-3 and PAN/TBT-3 membranes exhibited a discharge capacity of 107.72 mAh/g and 115.79 mAh/g at 2 C, and both the capacity retention rate was above 99.5% higher than 80.5% for Celgard 2400.
研究领域:
材料科学
·
纳米技术
·
储能
·
电化学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Liyun Zhang,Yi He,Pingya Luo,Lan Ma,Shuangshuang Li,Yiling Nie,Jing Yu,Xiao Guo
Considering the emulsified oil and water-soluble dyes in wastewater, the exploitation of easy-manufacturing, energy-saving and high-efficiency separation materials is urgently required. In this work, integrating the positively charged polyethyleneimine (PEI) with negatively charged CNTs-COOH constructed the superhydrophilic Cassie–Baxter structure onto the electrospun polyacrylonitrile (PAN) membrane surface by ultrasonic, electrostatic interaction and thermal treatment. Based on it, the PEN@CNTs membrane achieved efficient separation for surfactant-free, tween 80-stabilized, SDS-stabilized, and CTAB-stabilized emulsions (the fluxes reached 508–3158 L m −2 h −1 , the separation efficiency reached 99.42%) by the splendid water-penetration and oil-repellency, electrostatic interaction, and “aperture sieve”. Moreover, because of the porosity and strong charged surface of PEN@CNTs membrane, the anionic dyes can be quickly removed by one-step filtrate method (∼403 L m −2 h −1 ). Meanwhile, the PEN@CNTs membrane also achieved synchronous and efficient remediation for oil/dye mixture emulsions after many cycles. More importantly, facing the complex physical and chemical environments, the combination of the stabilized PEN membrane, inactive CNTs-COOH layer, and the bond of embedding method between CNTs-COOH and PEN nanofibers made the PEN@CNTs membrane demonstrated robust stability and durable separation capability.
研究领域:
环境科学
·
材料科学
·
水处理
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）