CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Yuqing Lu,Lihong Fan,Li-Ye Yang,Fangfang Huang,Xiao-kun Ouyang
Residual diclofenac sodium (DS) in water is a potential hazard. The electrostatic attraction between amino group of adsorbents and carboxyl group of DS under acidic conditions can effectively remove DS from water. Herein, a novel core–shell adsorbent of poly(vinyl alcohol)/chitosan/amino-grafted silica@polyethylenimine (PVA/CS/SAP@PEI) gel bead was prepared to efficiently uptake DS from wastewater. In this study, the gel bead was characterized using FTIR, XPS, SEM, EDS, and 13 C NMR. The experimental data shows that there is a strong correlation between adsorption capacity. The adsorption data fitted well with the Freundlich isotherm model and the pseudo-second-order model. The results of thermodynamics show that the adsorption process is spontaneous, endothermic, and increases entropy. The maximum adsorption capacity for DS was calculated as 493.81 mg/g at pH 5 (308 K). The adsorbent still exhibited excellent adsorption capacity after recycling five times, showing it has excellent potential for practical applications.
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DOI
PubMed
高影响因子
International Journal of Nanomedicine
·
2019
·
IF 4.471
Fei Tong,Xiangyuan Tang,Daojun Liu
Background Hepatic ischemia/reperfusion-induced pancreatic islet injury (HI/RIPII) was an important pathophysiological phenomenon in clinics. In the present study, we observed the effects of phycocyanin on HI/RIPII. However, the half-life of phycocyanin was extremely short and limited its use in vivo.Materials and methods In order to overcome this shortcoming, poly(ethylene glycol)-b-(poly(l-glutamic acid)-g-polyethylenimine) (PEG-b-(PG-g-PEI)) was synthesized and estimated as a nanocarrier for lengthening delivery of phycocyanin through the abdominal subcutaneous injection in rats. Phycocyanin (isoelectric point=4.3) was encapsulated with PEG-b-(PG-g-PEI) via electrostatic interactions at pH 7.4.Results In vitro phycocyanin was fast and efficiently encapsulated and showing efficient loading and sustained release. In vivo the anti-HI/RIPII function of phycocyanin/PEG-b-(PG-g-PEI) complex was surveyed in rats using free phycocyanin as the controls, and the results showed that phycocyanin/PEG-b-(PG-g-PEI) complex reduced HI/RIPII property and enlarged islet functionality.Conclusion These results suggested that PEG-b-(PG-g-PEI) might be treated as a potential phycocyanin nanocarrier.
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Weidong Wang,Ying Gao,Meijie Sun,Zhiqiang Xu,Yanan Tu
Coal gasification fine slag (CGFS) is a solid waste produced during the gasification process, and its high carbon content limits its large-scale utilization. However, the preparation of amine modified hierarchical porous carbon adsorbents (HPCs) from CGFS not only reduces the production costs of matrix materials but also achieves high-value utilization. In this study, the high-carbon component of CGFS was utilized as the raw material to successfully synthesize an amine-modified HPCs for coupled CO 2 capture and mineralization via pre-impurity removal, chemical activation, and amine impregnation. Results demonstrated that HPCs exhibited excellent CO₂ adsorption performance. Specifically, the CO₂ adsorption capacities of 20 % PEI@HPC and 10 % TEPA@HPC with optimal amine loading reached 2.11 mmol/g and 1.62 mmol/g at 298 K, respectively. Both demonstrated outstanding CO₂ adsorption-desorption cycling performance and stability after 10 cycles. Furthermore, the amine-modified HPCs effectively enhanced the carbonation efficiency of desilicated slag, with 20 % PEI@HPC and 30 % TEPA@HPC increasing the mineralization efficiency of the desilicated slag from 28.68 % to 75.01 % and 82.69 %, respectively. Finally, this study elucidated the mechanism of coupled CO₂ capture and mineralization with amine-modified HPCs. The adsorption isotherm models revealed that CO₂ adsorption on the amine-modified HPCs was influenced not only by physical adsorption but also through chemical adsorption dominated by amine functional groups. In this study, a cost-effective CGFS was used as the raw material to synthesize amine-modified HPCs with excellent CO 2 adsorption performance. This approach was expected to address the issues of single-source and expensive matrix materials and had some potential for industrial- scale utilization.
研究领域:
环境科学
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材料科学
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碳捕集与封存
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废弃物高值化利用
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吸附技术
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高影响因子
MONATSHEFTE FUR CHEMIE
·
2023
·Vol. 154
·期 3
·367-377
·
IF 1.8
Guo Xuejing,Zhang Yewen,Peng Yanqing
Application of solar thermal energy relies on photothermal effect is one of the emerging topics in green chemical research. Polyethylenimine-grafted graphene oxide (PEI@GO) can harvest thermal energy directly from visible light and be employed as photothermal catalyst in model reactions. Furthermore, this nanocomposite used in carbon dioxide capture-and-release processes relied on photothermal regeneration. Graphical abstract
研究领域:
材料科学
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纳米技术
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环境科学
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化学工程
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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
·
电气工程
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Ruibin Guo,Wei Guo,Hebing Pei,Bingjie Wang,XuDong Guo,Nijuan Liu,Zunli Mo
Chromium (Cr (VI)) is one of the heavy metals that seriously endanger human health and the environment. It is a huge challenge to develop high-efficiency adsorbents with low cost, simple preparation method and green production technique and zero pollution to the environment. In this work, electrospinning technology was used to prepare polyacrylonitrile/polyethyleneimine (PAN/PEI) electrospinning nanofiber membranes (ENM), and then polyacrylonitrile/polyethyleneimine/polypyrrole (PAN/PEI/Ppy) composite nanofiber membrane (CNM) was successfully synthesized by chemical depositing polypyrrole (Ppy) on the surface of PAN/PEI ENM. PAN/PEI ENM provided a larger specific surface area, which facilitated better and more uniform deposition of Ppy on the surface of nanofiber membranes. Scanning electron microscope (SEM) and transmission electron microscope (TEM) images showed that the prepared PAN/PEI/Ppy CNM looked like "balsam pear", and had high adsorption capacity of Cr (VI), with a maximum adsorption capacity of 368 mg g -1 . After five times of adsorption-desorption, the removal of Cr (VI) reached more than 95%. More importantly, compared to the current complex chemical synthesis of Cr (VI) ion adsorbents and secondary pollution to the environment, electrospinning fully demonstrates the huge technical advantages of industrial applications, including high efficiency, simple preparation, and green (no harmful chemical by-products), low cost, no secondary pollution. PAN/PEI/Ppy CNM will be promising solid adsorbent candidates for the removal of Cr (VI) ions in wastewater.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2025
·
IF 4.6
Jingjing Tian,Mengen Yan,Ran Xu,Jiayang Zhao,Luodan Wang,Weisong Zhang,Yan Guo,Heng Tian,Yonghao Xu
Polymer-based dielectric capacitors are considered as important energy storage components in the electronic devices and power system owing to their high power density, fast charge–discharge speed, and good reliability. However, the increment of leakage current density at elevated temperature and electric field significantly descends the breakdown strength ( E b ) and energy storage density, restricting their application in harsh environments. Herein, we selected ZnO and SnO 2 n-type semiconductors to construct nn-heterojunction ZnO-SnO 2 nanofibers and introduced them into PEI matrix to fabricate the ZnO-SnO 2 /PEI nanocomposite films via solution casting method. By constructing potential barrier at the interface of ZnO and SnO 2 , charge carrier can be captured and constrained in the potential barrier well during the process of carrier transport, effectively hindering the charge conduction in the nanocomposites, and thus suppressing the leakage current density and boosting the E b and energy storage density. As a consequence, nanocomposite film with 0.50 wt% nanofibers demonstrates high E b of 647 MV/m and large discharge energy density ( U d ) of 8.24J/cm 3 at 25 ℃. Even at 150 ℃, superior U d of 6.02 J/cm 3 , high charge–discharge efficiency ( η ) of 83.5 %, high E b of 593 MV/m are realized in the nanocomposite, which are significantly enhanced than that of pure PEI ( U d ∼ 1.98 J/cm 3 , η ∼ 57.5 %, E b ∼ 438 MV/m). The work provides a novel and feasible strategy for developing high-performance polymer-based dielectric capacitors at elevated temperature.
研究领域:
材料科学
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高分子物理
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介电材料
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能源存储
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纳米复合材料
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电子器件
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DOI
高影响因子
RARE METALS
·
2020
·Vol. 40
·期 5
·1099-1109
·
IF 2.161
He Bao-Shan,Li Jia-Wen
CoSe 2 nanosheet materials with a wrinkled sheet structure and large surface area were synthesized via a simple hydrothermal method. Then polyethyleneimine (PEI) was used to functionalize wrinkled CoSe 2 (w-CoSe 2 ) to make gold nanocubes (AuNCs) uniformly anchored onto the surface of PEI-w-CoSe 2 via Au–N bonds. And its application in electrochemical immunosensors for the detection of dipropyl phthalate (DPrP) was studied. The obtained material was characterized by the Fourier transform infrared spectroscopy (FTIR), transmission electron microscope (TEM), energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD) and Raman spectroscopy. The effective surface area and conductivity of the electrode were enhanced by the introduction of AuNCs/PEI-w-CoSe 2 nanocomposite. Cyclic voltammetry (CV), differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS) were used to characterize the performance of immunosensor. After DPrP binds to antibodies via the antigen–antibody interaction, [Fe(CN) 6 ] 3-/4- was used as a signal probe to monitor the change of oxidation current of different DPrP concentrations. Under optimal conditions, the electrochemical responses of the prepared immunosensor were linear when the DPrP concentrations ranged from 1 × 10 −11 to 1 × 10 −5 mol·L −1 , with a detection limit of 1.39 × 10 −12 mol·L −1 . The coefficient of determination ( R 2 ) is 0.995, indicating that the degree of fitting is good. Besides, the constructed immunosensor exhibited acceptable reproducibility, selectivity, and stability. Therefore, it may be found that the composite material has good application prospects in the electrochemical sensors field.
研究领域:
分析化学
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环境科学
·
纳米材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
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
·
材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
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
·
电气工程
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DOI
高影响因子
Materials Today Energy
·
2026
·
IF 8.1
Siyu Zhang,Tianran Zhang,Mengfan Song,Siyuan Li,Lixue Zhang,Jiping Wang
Polymer dielectrics are widely used due to their ultra-high breakdown strength and low dielectric loss. However, mitigating the significant reduction in breakdown strength and energy storage efficiency caused by increased conductive loss at high temperatures remains a major challenge. In this study, a ternary composite dielectric is synthesized via the introduction of nano core-shell fillers SiC@SiO 2 and ferroelectric polymer P(VDF-HFP) into polyetherimide (PEI). This compositional design not only enable P(VDF-HFP) to form an "island-like" phase separation structure but also facilitate the spontaneous segregation of SiC@SiO 2 in P(VDF-HFP) phase. Consequently, self-assembled hierarchical SiC@SiO 2 /P(VDF-HFP)/PEI interfaces are constructed in PEI matrix. Experimental results demonstrate that this dielectric maintains a low leakage current density over a wide temperature range, from room temperature to 150 °C. The introduction of two fillers creates more charge traps at the self-assembled hierarchical interface, effectively inhibiting the conductive loss mechanism. Finally, under 150 °C and 750 MV/m, the optimized dielectric achieves a discharge energy density of 10.10 J/cm 3 , an ultra-high energy storage efficiency (96.7%), and an excellent figure of merit (∼306.06). This work provides certain theoretical support for the construction of hierarchical interfacial modulation of carrier transport and the optimization of high-temperature polymer-based energy storage.
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高影响因子
危险品化学品经营许可证（带存储）