SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Li Nan Xu,Yu Xiang Liu,Ya Yuan Zhang,Na Qin,Peng Xiang,Xiong Huang,Jian Hua Chen,Qian Yang
Covalent Organic Frameworks (COFs), with their high porosity, low mass density, excellent thermal stability, and tunable structures, exhibit immense potential in the field of membrane separation. However, the porous structure of COFs and their negatively charged nature result in suboptimal performance in dye/salt separation. Tetrakis(hydroxymethyl)phosphonium chloride (THPC), a zwitterionic liquid, contains a central phosphorus atom and numerous hydroxyl groups, offering the dual optimization characteristics of balancing membrane surface charge and optimizing membrane pore structure. In this study, we first modified polyethersulfone (PES) with p-phenylenediamine to prepare an amino-functionalized NH 2 PES support membrane. Subsequently, we synthesized the COFs selective layer on the NH 2 PES surface via interfacial polymerization to obtain the COFs-NH 2 PES composite membrane. Then, we employed polyethyleneimine (PEI) to modify the COFs-NH 2 PES membrane surface through a polyelectrolyte-mediated assembly strategy, forming the PEI/COFs-NH 2 PES composite membrane. Finally, we conducted THPC modification to prepare the THPC-PEI/COFs-NH 2 PES composite nanofiltration membrane. Zeta potential analysis indicated that the surface charge of the THPC-PEI/COFs-NH 2 PES composite nanofiltration membrane was essentially neutral, favoring dye/salt separation. Dye/salt separation experiments demonstrated that the THPC-PEI/COFs-NH 2 PES composite nanofiltration membrane exhibited excellent separation performance, with a CR rejection rate and dye/salt separation factor reaching up to 99.5 % and 181.2, respectively, and a flux of 211.36 L m −2 bar -1 h −1 . Additionally, by adding THPC, the membrane surface was exposed to a greater number of hydroxyl functional groups, which improved the anti-fouling and stability of the THPC-PEI/COFs-NH 2 PES composite nanofiltration membrane over time.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2024
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IF 8.3
Jingyu Lin,Junhao Jiang,Yukang Zhou,Qianqian Fan,Qixin Zhuang,Puke Mi,Wei Yin,Peiyuan Zuo
Mixing fillers featured with wide band gaps in polymers can effectively meet the requirement of higher energy storage densities. However, the fundamental relationship between the crystal structures of fillers and the dielectric properties of the corresponding nanocomposites is still unclear. Accordingly, we introduced ultralow contents of the synthesized cubic Hafnium dioxide (c-HfO2) or monoclinic Hafnium dioxide (m-HfO2) as deep traps into poly(ether imide) (PEI) to explore their effects on dielectric properties and the charge-blocking mechanism. m-HfO2/PEI showed better charge trapping due to the higher electron affinity and deeper trap energy. At room temperature, the 0.4 vol % m-HfO2/PEI maintains an ultralow dielectric loss of 0.008 while obtaining a dielectric constant twice that of pure PEI at 1 kHz, simultaneously outperforming in terms of leakage current density, breakdown strength (452 kV mm–1), discharge energy density (Ud, 5.03 J cm–3), charge–discharge efficiency (η, 92%), and dielectric thermal stability. At 125 °C, it exhibits a considerable Ud of 2.48 J cm–3 and a high η of 85% at 300 kV mm–1, surpassing the properties of pure PEI. This promising work opens up a new path for studying HfO2-derived dielectrics with unique crystal structures.
研究领域:
材料科学
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电气工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Shiwei Tian,Yaqi Zhang,Qiankun Sha,Xingxiang Zhang,Tian Yang,Xuhuan Yan,Na Han
Polyphenylene sulfide (PPS) microporous membranes have garnered extensive research enthusiasm concerning their outstanding permeation performance and separation accuracy in treating oily wastewater. Nevertheless, the inherent hydrophobic chemical structure, along with the noticeable concentration polarization effect, predisposes them to severe membrane contamination during the separation process. Accordingly, it is desirable to design a PPS self-cleaning membrane with superior anti-fouling capability, fast transport, and remarkable flux recovery. This study marks the first combination of PPS membrane materials with the photo-Fenton process. In detail, the polyphenol (tannic acid, TA)-polycation (polyethyleneimine, PEI)-metal ion (Fe 3+ ) double cross-linking coatings were first assembled on the PPS substrate surface. Subsequently, β-FeOOH photocatalysts were synthesized through in-situ mineralization to further strengthen the hydrophilicity of the membranes. The obtained PPS/TA-PEI/β-FeOOH composite membrane achieved exceptional separation of diverse oil-in-water (O/W) emulsions. The PPS/TA-PEI/β-FeOOH membranes exhibited in-air superhydrophilic and under-water superoleophobicity, exhibiting under-water oil contact angles greater than 151° for diverse oil agents. The fabricated composite membranes displayed high permeability (a flux of the petroleum ether-in-water (P/W) emulsion reached 3400.5 L m −2 h −1 bar −1 driven by a pressure of 0.05 MPa) along with ideal oil rejection (98.6 %). Significantly, the PPS/TA-PEI/β-FeOOH membrane possessed powerful photo-Fenton self-cleaning capability, and its flux recoveries of the contaminated membrane exceeded 90.3 % for varied O/W emulsions after being cleaned by visible light for 10 min. We believe that our research presents a novel approach for the exploitation of PPS-based photo-Fenton self-cleaning membranes, which also exhibit great applicative potential in oily wastewater treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Shuyang Zhou,Hang Zhao,Na Zhang,Lei Yin,Jinbo Bai
With the rapid development of electric vehicles, aerospace technology, and other emerging applications, the demand for polymer film capacitors capable of operating under extreme conditions is increasing rapidly. However, the significant rise in conduction losses at high temperatures and high electric fields results in substantial deterioration in energy storage performance of polymer dielectrics. Thus, designing composite dielectrics in structural to effectively mitigate their conduction losses remains a critical challenge. This study introduces a typical sandwich-structured high-temperature polymer-based composite dielectric, incorporating surface-charged kaolinite nanosheets (KLNS) and the organic molecular semiconductor 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA) with high electron affinity in different polyetherimide (PEI) layers, respectively. This construction introduces differential charge traps into the composites to modulate charge migration and capture the charges that injected from electrodes or excited in the dielectric. Experimental results demonstrate that this construction effectively reduces leakage current caused by Poole-Frenkel emission and hopping conduction, thereby suppressing the conduction losses of composites at high temperatures. Consequently, the sandwich-structured composite exhibits an excellent high-temperature stability in electrical properties and the optimized composite filled with 0.2 wt% KLNS in the middle layer and 0.5 wt% NTCDA in the outer layers achieves an ultrahigh discharged energy density ( U e ) of 5.0 J/cm 3 and a high efficiency ( η ) of 88.7 % at 150 °C, representing improvements of 163 % and 41 % compared with pure PEI ( U e ∼ 1.9J/cm 3 , η ∼ 62.8 %), respectively. This study presents an effective strategy for designing composites with enhanced energy storage capabilities under high-temperature and high-electric-field conditions.
研究领域:
材料科学
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电气工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Bing Liu,Dan Li,Jie Yao,Hao Sun
This study demonstrated a new method for simultaneously improving the interfacial morphology and gas separation properties of mixed matrix membrane by designing a new type of nanocomposite filler (UiO-66-PEI@[bmim][Tf 2 N]). Nano-sized UiO-66 particle was post-synthetically modified with branched polyethyleneimine (PEI) and then was decorated with ionic liquid. The abundant amino groups in UiO-66-PEI improve the gas separation properties of the MMM due to the affinity between PEI and CO 2 . The ionic liquid acts as a lubricant agent, which is coated on the crystal surface improves the interface morphology of the MMM. Compared to pristine 6FO and MOF/6FO membrane, MOF@IL/6FO membrane has higher gas separation performance. Characterization and gas separation results indicated the UiO-66-PEI@ILs particles were homogeneous dispersed in 6FDA-ODA and promoted CO 2 transport by reversible reaction with amine groups. Consequently, the membrane sample containing 15 wt% loading of the UiO-66-PEI@[bmim][Tf 2 N] filler displayed an optimum CO 2 /CH 4 selectivity of 59.99 for CO 2 and CH 4 mixture gas.
研究领域:
材料科学
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膜技术
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气体分离
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纳米复合材料
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化学工程
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DOI
高影响因子
MICROCHEMICAL JOURNAL
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2023
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IF 4.8
Xiaohu Ma,Congcong Lv,Peiyu Jiang,Jingbo Geng,Yanli Guo,Yu Zhang,Yuchuan Liu,Yan Jin,Baoxin Li,Wei Liu
The trace acetone determination in breath can be regarded as a noninvasive method for diagnostic of diabetes. There is an urgent demand to develop a simple method for acetone detection which can be easily performed at home. Here, UiO-66-NH 2 @PEI with the appropriate aperture size combined with the hand-held sensor was used to construct the adsorption–desorption sensing platform for separation and enrichment of acetone in exhaled breath (EB). UiO-66-NH 2 @PEI can realize the selective adsorption, desorption and separation for acetone in EB. The flameless combustion hand-held sensor can sensitively respond to acetone in the range of 0.2–12.0 ppm and it can achieve the accurate determination of acetone content in EB of diabetic patients. The hand-held sensor is inexpensive, lightweight and easy to operate, which has great application prospects for the widespread use for diabetic patients in family life.
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Shuai Ding,Yanchen Zhu,Haonan Zhang,Yajun Fu,Hao Ren,Huamin Zhai
Cr (VI) accumulates in an aqueous environment and exhibits huge harm to human health and the ecological system. Developed lignin biomass materials are complicated to prepare and have limited properties, and advances in lignin phenolic modification are lacking. Herein, an aminated poplar lignin-pyrogallol (PLP-PEI) with a simple design and adjustable phenolic hydroxyl content was developed using the acid hydrolysis-phase separation (AH-PS) method, and modified by the atom transfer radical polymerization (ATRP) strategy. Through diverse characterization analysis, the structural changes of PLP-PEI in the step-by-step synthesis process were monitored. An effective biomass capture system (Bio-Cap) was shown via systematically investigating the adsorption behaviors of Cr (VI) on PLP-PEI under various environmental conditions. Benefiting from introducing phenolic hydroxyl and amino groups, PLP-PEI demonstrated efficient adsorption capacity (598.80 mg/g for Cr (VI)). Additionally, the material also exhibited advantages, including monomeric chemisorption properties, strong reduction capability, and stable regeneration properties. Multiple driving forces were involved in the capture and removal process of Cr (VI), including complexation and electrostatic interaction. The low-cost natural biomass resources supported the industrial-scale synthesis and practical application of advanced aminated lignin polyphenol material, which showed outstanding advantages and enormous potential in the field of water environmental restoration.
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产品关联
DOI
PubMed
高影响因子
LANGMUIR
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2023
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IF 3.9
Xiaoya Meng,Maosheng Sang,Qi Guo,Zhongyu Li,Quanlong Zhou,Xia Sun,Wenping Zhao
Herein, a sensitive and selective electrochemical sensor based on aptamer folding was constructed to detect aflatoxin B1 (AFB1) in peanuts. Specifically, polyethylenimine-functionalized multiwalled carbon nanotubes modified with molybdenum disulfide (MoS2@MWCNTs–PEI) were used as the electrode matrix to enable a large specific surface area, which were characterized by the Randles–Sevcik equation. Additionally, AuNPs were used to immobilize the aptamer via the Au–S covalent bond and provide a favorable microenvironment for signal enhancement. Methylene blue (MB) was modified at the proximal 3′ termini of the aptamer as the capture probe, while the signal transduction of the sensor was obtained through changes in conformation and position of MB induced by the binding between AFB1 and the probe. Changes in spatial conformation could be recorded by electrochemical methods more readily. This electrochemical aptasensor demonstrated remarkable sensitivity to AFB1 with an extensive detection range (1 pg/mL to 100 ng/mL) and a lower limit detection (1.0 × 10–3 ng/mL). Moreover, using the constructed aptasensor, AFB1 was identified successfully in peanut samples, with recoveries ranging from 95.83 to 107.53%, illustrating its potential use in determining AFB1 in food.
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DOI
PubMed
高影响因子
BIOMATERIALS
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2014
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IF 8.312
Xiuli Bao,Wei Wang,Cheng Wang,Yu Wang,Jianping Zhou,Yang Ding,Xiaoyi Wang,Yuting Jin
A multifunctional copolymer–anticancer conjugate chitosan-graft-polyethyleneimine-candesartan (CPC) containing low molecular weight chitosan (CS) backbone and polyethyleneimine (PEI) arms with candesartan (CD) conjugated via an amide bond was fabricated as a targeted co-delivery nanovector of drug and gene for potential cancer therapy. Here, CD was utilized to specifically bind to overexpressed angiotensin II type 1 receptor (AT 1 R) of tumor cells, strengthen endosomal buffering capacity of CPC and suppress tumor angiogenesis . The self-assembled CPC/pDNA complexes exhibited desirable and homogenous particle size, moderate positive charges, superior stability, and efficient release of drug and gene in vitro . Flow cytometry and confocal laser scanning microscopy analyses confirmed that CD-targeted function and CD-enhanced buffering capacity induced high transfection, specific cellular uptake and efficient intracellular delivery of CPC/pDNA complexes in AT 1 R-overexpressed PANC-1 cells. In addition, CPC/wt-p53 complexes co-delivering CD and wild type p53 (wt-p53) gene achieved synergistic angiogenesis suppression by more effectively downregulating the expression of vascular endothelial growth factor (VEGF) mRNA and protein via different pathways in vitro , as compared to mono-delivery and mixed-delivery systems. In vivo investigation on nude mice bearing PANC-1 tumor xenografts revealed that CPC/wt-p53 complexes possessed high tumor-targeting capacity and strong anti-tumor activity. Additional analysis of microvessel density (MVD) demonstrated that CPC/wt-p53 complexes significantly inhibited tumor-associated angiogenesis. These findings suggested that CPC could be an ideal tumor-targeting nanovector for simultaneous transfer of drug and gene, and a multifunctional CPC/wt-p53 co-delivery system with tumor-specific targetability, enhanced endosomal buffering capacity and synergistic anti-angiogenesis efficacy might be a new promising strategy for effective tumor therapy.
研究领域:
药剂学
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分子生物学
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肿瘤学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Yunwu Yu,Yan Wu,Zhenchun Li,Yan Wang,Peng Liu,Lihua Wang,Changwei Liu,Ye Wan,Xiaowei Sun,Wenhao Pan
In order to improve both pure water flux and retention rate of the cross-linked ultrafiltration membranes based on phenolphthalein-based poly(ether ether ketone) (PEEKWC) and polyethyleneimine (PEI), poly(ethylene glycol) (PEG) and polyvinylpyrrolidone (PVP) were used as polymeric additives in non-solvent-induced phase separation process. The characterizations, separation effectiveness, and anti-fouling performance of membranes were investigated. Compared with n-butanol additive, the PEG and PVP could accelerate the phase separation rate and form thinner and denser skin layer, and then that led to an increase in the fluxes of pure water and better dye retention performance. In addition, the impact of variable additive dosage on the pure water flux and retention for dye solutions was investigated, and the pure water flux of membranes could reach 3270.8 L·m −2 ·h −1 and 2494.5 L·m −2 ·h −1 at a PEG or PVP concentration of 0.5 wt%, respectively. These membranes also exhibited excellent retention performance for Coomassie brilliant blue and Congo red greater than 98%. The simultaneous improvement of pure water flux and retention performance also could be related to the more efficient water transmission channel forming which was investigated by atomic force microscope phase images. In anti-fouling performance tests , the membranes demonstrated effective anti-fouling properties with a high flux recovery ratio after external cleaning with water only.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
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IF 5.2
Qingguo Chi,Limeng Xu,Changhai Zhang,Yue Zhang,Yongquan Zhang,Chao Tang,Tiandong Zhang
Dielectric film capacitors are a highly ubiquitous and indispensable electronic component, serving a crucial role in a wide array of electronic devices and power systems. Despite their extensive use, polymer film capacitors are often hampered by the conduction loss that ensues when they are subjected to high electric fields and temperatures. As a result, this leads to a significant reduction in energy density and charge-discharge efficiency. To solve this issue, magnetron sputtering technology was used to create a sandwich structure made of polyetherimide (PEI) thin films with lead zirconate titanate (PZT) inorganic layers coated on both sides. This remarkable innovation has successfully introduced the high dielectric PZT layer in the PEI film/metal electrode, substantially augmenting the barrier height at the dielectric/polymer interface. This has also resulted in a marked decrease in conduction loss, as conclusively validated by the experimental findings. At 150 °C and with charge-discharge efficiency above 90%, the maximum discharged energy density is 3.26 J/cm 3 , which is increased by 263% compared to the pristine PEI films (1.24 J/cm 3 at 290 MV/m and 150 °C). This study designed a unique inorganic barrier layer of PZT to increase the energy storage capability of polymer dielectric films in high-temperature environments.
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DOI
高影响因子
DESALINATION
·
2023
·
IF 9.9
Qingyi Wang,Yuyang Wang,Yangxiang Huang,Huimin Wang,Yang Gao,Mingyu Zhao,Longdou Tu,Lixin Xue,Congjie Gao
To effectively separate Mg 2+ and Li + from high Mg 2+ /Li + ratio salt lake brine, positively charged thin film composite polyamide (TFC-PA) nanofiltration (NF) membranes were prepared by the interface polymerization involving polyethyleneimine (PEI) with benzenetricarbonyl chloride (TMC). In this work, the structures and performances of PEI based TFC-PA NF membrane prepared on polysulfone (PSF) ultrafiltration substrates from the normal interface polymerization process PSF(NIP), was compared with those on the same substrates from the reverse-phase interface polymerization (RIP) process PSF(RIP), and those on polyethylene substrates from RIP process PE(RIP). Results showed that PSF(RIP) showed improved Mg 2+ /Li + separation factor S Li/Mg from PSF(NIP) with an increased surface positive charge, but with greatly reduced water flux values due to reduced surface roughness , increased surface hydrophobicity , and decreased MWCO Stokes pore radius. PE(RIP) NF membrane showed not only higher Mg 2+ /Li + separation factor S Li/Mg , but also higher water flux values due to increased surface roughness, decreased PA cross-linking degree, reduced PA separation layer thickness, and increased MWCO Stokes pore radius. PE(RIP) NF membrane also showed high rejection rates to a variety of divalent metal salts with high separation factors S Li/Mg of 40–49, high brine permeability values of 10.5 L·m −2 ·h −1 ·bar −1 , and excellent chemical and operational stability.
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）