CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jinqiang Wang,Zhaoyang Su,Nigel J.D. Graham,Hongkai Liu,Kai Sun,Wenzheng Yu
This paper focuses on the functionalization of double positively charged polyethylenimine (PEI)/Zr 4+ -polyamide (PA) nanofiltration (NF) membrane by connecting Zr 4+ with positively charged PEI-PA NF membrane surface. In particular, the properties of prepared PEI/Zr 4+ -PA NF membrane, performance on removing aquatic contaminants (Cr 3+ and trimethoprim), and its antifouling ability were evaluated in detail. In this regard, zirconium acetate was successfully adopted as the zirconium source for stable membrane surface charge control. Zr 4+ loading increased the hydrophilicity of the PEI-PA NF membrane, improved permeate flux, and enhanced the removal behavior of PEI/Zr 4+ -PA NF membrane especially when exposed to Cr 3+ and trimethoprim at high concentrations. Furthermore, effectiveness of PEI/Zr 4+ -PA NF membrane was not affected by high filtering degree, filtration cycle, and negatively charged macromolecules, such as bovine serum albumin (BSA). Also, antifouling ability of PEI/Zr 4+ -PA NF membrane could be further improved by continuously loading Zr 4+ .
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yanjun Zhang,Yu Yang,Satoshi Takizawa,Keisuke Kuroda,Zhiqian Jia,Peijuan Liu,Huangzhao Wei,Nigel J.D. Graham
The simultaneously efficient removal of radionuclides and heavy metals is an important and challenging topic for aquatic environmental protection. In this work, molybdenum disulfide (MoS 2 ) with heavy metal ion adsorption capacity and positively charged polyethyleneimine (PEI) were used to fabricate a novel layer-by-layer (LbL) self-assembly composite membrane by a simple alternating immersion method. The unique structure with positive charge ensures high removal for toxic metals (R Cs(I) = 99.83 %, R Sr(II) = 100 %, R Hg(II) = 99.2 %, R Pb(II) = 98.13 %, R As(III) = 98.5 %). The inherent low resistance channels in MoS 2 provided the optimized composite membrane an elevated water flux. Long-term experiments and membrane regeneration also demonstrated that the membrane possesses exceptional stability and reusability in removing low levels of radionuclides Cs(I) and Sr(II) from water. This study confirms the feasibility of the MoS 2 -PEI composite membrane for the treatment of contaminated waters containing radionuclides and heavy metals.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Xiaohuan Liu,Wenwu Cheng,Yangmi Yu,Shengtao Jiang,Yuzhi Xu,Enmin Zong
A novel adsorbent of ZrO 2 /PEI/Fe 3 O 4 functionalized MWCNTs composite (MWCNTs@Fe 3 O 4 @PEI-Zr) possessing a high affinity to phosphate and easily separated from aqueous solution was proposed in this work. The ZrO 2 and PEI modified on the surface act as active sites for the removal of phosphate, while the Fe 3 O 4 allows for the easy separation by applying an external magnetic field . Compared to traditional separation like centrifugation, magnetic separation markedly reduces energy consumption and provides more possibilities for application. The composite exhibits a relatively high surface area of 162.9 m 2 g -1 with a larger number of mesopores. As-prepared MWCNTs@Fe 3 O 4 @PEI-Zr is found to have a relatively high phosphate adsorption capacity of 21.14 mg P g −1 and it can be recovered rapidly from water under an external magnetic field . Moreover, MWCNTs@Fe 3 O 4 @PEI-Zr exhibits an outstanding anti-interference capability in terms of the coexisting ion and ionic strength of solutions. Importantly, the dissolution of Zr and Fe are negligible (less than 0.015 mg L −1 ) over a wide pH range of 4.04–9.98, indicating that the MWCNTs@Fe 3 O 4 @PEI-Zr is a structurally stable hybrid composite particle with strong interaction. Furthermore, it shows a good reusability and 86.2% removal efficiency of phosphate remains after three consecutive cycles. Both the ligand exchange and the electrostatic attraction are mainly responsible for phosphate removal by MWCNTs@Fe 3 O 4 @PEI-Zr. This work demonstrated that the highly efficient, easy separable, high stability and reusability MWCNTs@Fe 3 O 4 @PEI-Zr composite has the potential for phosphate removal.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
·
2014
·
IF 3.432
Miao-Miao Xun,Yan-Hong Liu,Qian Guo,Ji Zhang,Qin-Fang Zhang,Wan-Xia Wu,Xiao-Qi Yu
Routine clinical implementation of human gene therapy requires safe and efficient gene delivery methods. Linear biodegradable polyesters with carbon–carbon double bonds are prepared from unsaturated diacids and diols . Subsequent appending of low molecular weight PEI by Michael addition gives target cationic polymers efficiently. Agarose gel retardation and fluorescence quenching assays show that these materials have good DNA binding ability and can completely retard plasmid DNA at weight ratio of 0.8. The formed polyplexes have appropriate sizes around 275 nm and zeta-potential values about +20–35 mV. The cytotoxicities of these polymers assayed by MTT are much lower than that of 25 kDa PEI. In vitro transfection toward 7402, HEK293 and U-2OS cells show that polymer P1 may give dramatically higher transfection efficiency (TE) than 25 kDa PEI, especially in U-2OS cells, suggesting that such polymer might be promising non-viral gene vectors .
研究领域:
生物材料学
·
基因治疗
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 64
·33866-33873
·
IF 3.708
Zheng-Yong Chen,Hong-Wen Gao,Jia-Xiang Yang
The PEI@Mg2SiO4 hybrid composite is readily synthesized for adsorbing carbon dioxide (CO2) and nitrophenol compounds (NACs), in which more than 11% PEI is embedded. By the removal rate of 4-nitrophenol (10 mg L−1) and the capture capacity of CO2, the Mg2+ : PEI : SiO32− optimal mole ratio of the PEI@Mg2SiO4 is 1 : 0.6 : 1.5. The composite shows the highest adsorption amounts of 0.94 mmol g−1 CO2 at 50 °C. The heat treatment regeneration exhibits a good stability, e.g. the CO2 capture capacity decreases by only 20% after four cycles, and the desorption rate of CO2 remains more than 91%. It also exhibites a fast adsorption and high capacity for 4-nitrophenol (NP), 2,4-dinitrophenol (DNP) and 2,4,6-trinitrophenyl group (TNP). The adsorption capacity of NP, DNP and TNP is 2.40 mmol g−1, 2.66 mmol g−1 and 4.85 mmol g−1 respectively, which is more than that of the conventional sorbents. This work presents the higher capacity and eco–friendly sorbent for CO2 and nitrophenol compounds.
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
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Shichen Zeng,Xu Liang,Mingang Zhao,Yanxiong Ren,Hanze Ma,Ziting Zhu,Yuhan Wang,Shaoyu Wang,Junyi Zhao,Guangzhaoyao Yang,Xuerui Wang,Fusheng Pan,Guangwei He,Zhongyi Jiang
Covalent organic frameworks (COF) are deemed as disruptive membrane materials owing to their versatile functionalities, high stability and ordered nanochannels. However, the size mismatch between the COF intrinsic pore and gas molecules becomes a grand challenge when using COF membrane for carbon capture. Herein, we propose a new type of polymer-functionalized COF laminar membranes through grafting CO 2 -phlic polyethyleneimine (PEI) polymer onto carboxylic acid COF (cCOF) laminar membranes. The cCOF nanosheets with high density of carboxyl groups are prepared via modified single phase solution method and then assembled to fabricate membranes. Further, the cCOF membranes are functionalized with PEI using 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide/N-Hydroxysuccinimide (EDC/NHS) coupling chemistry. The introduction of abundant amino groups from PEI afford the affinity of membranes toward CO 2 . Meanwhile, the graft of the PEI polymers reduces the defects or pinholes on the membrane surface. As a result, the PEI functionalized cCOF membranes exhibit a high CO 2 permeance of 1004 GPU and a CO 2 /N 2 selectivity of 33.7, which reach the carbon capture target performance and show great prospect for treating real flue gas. Our approach of functionalizing cCOF membranes with tailored functionalities may inspire the design of molecule-selective COF membranes.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Xiaoting Zhang,Runping Han
ABSTRACT A novel film adsorbent (PVDF-PEI) was prepared by simple blending polyethyleneimine and polyvinylidene fluoride for efficient uptake Cu(II) and Pb(II) from solution. The characterization of PVDF-PEI was investigated by Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy. Moreover, the effect about adsorbent mass, solution pH, salinity, contact time, temperature and initial Cu(II) and Pb(II) concentrations was researched by batch experiments, respectively. The adsorption quantity of Cu(II) and Pb(II) was to 81.3 and 178 mg g –1 from Langmuir model under the solid-liquid ratio was 0.5 g L –1 for 8 h at 303 K. Freundlich model and Koble–Corrigan mode well predicted the adsorption isotherms while pseudo-first-order and Elovich models appropriately described the adsorption kinetic curves. The thermodynamic parameters illustrated that both processes were endothermic and spontaneous reactions with increased entropy. Cu-loaded PVDF-PEI and Pb-loaded PVDF-PEI were better regenerated by using 0.1 mol L –1 HCl and HNO 3 , respectively. The mechanisms were both complexation and ion exchange. Overall, it is referred that PVDF-PEI be promising for eliminating Cu(II) and Pb(II) from wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ORGANIC & BIOMOLECULAR CHEMISTRY
·
2012
·Vol. 11
·期 7
·1242-1250
·
IF 3.696
Miao-Miao Xun,Xue-Chao Zhang,Ji Zhang,Qian-Qian Jiang,Wen-Jing Yi,Wen Zhu,Xiao-Qi Yu
Non-viral gene vectors play an important role in the development of gene therapy. In this report, different hydrophobic chains were introduced into low molecular weight (LMW) PEI-based biodegradable oligomers to form a series of lipopolymers (LPs), and their structure–activity relationships were studied. Results revealed that the nine polymers can condense plasmid DNA well to form nanoparticles with appropriate sizes (120–250 nm) and positive zeta-potentials (+25–40 V). In vitro experiments were carried out and it was found that LP2 showed much higher transfection efficiency both in the presence and in the absence of serum under the polymer/DNA weight ratio of 0.8 in A549 cells.
研究领域:
生物技术
·
基因治疗
·
药剂学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 50
·26309-26315
·
IF 3.708
Zheng-Yong Chen,Ya-Yuan He,Hong-Wen Gao
A “dissolving and rebuilding” method was applied to prepare a diatomiteethyleneimine–polymer (PEI) hybrid composite, and its structure and topography were characterized by XRD, SEM, TEM, FTIR, DTG, elemental analysis and ζ-potential. The results indicated that the PEI was efficiently assembled into the SiO2 framework formed from diatomite. Attempts were made to use the composite to remove phenolic pollutants, e.g. phenol, o-chlorophenol and bisphenol A (BPA), from aqueous solution. These adsorptions were to be in accordance with lipid–water-partition law, and their Kaw values were calculated to be 79.1 L kg−1 for phenol, 37.3 L kg−1 for o-chlorophenol and 24.2 L kg−1 for BPA.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Huanhuan Wu,Haoyue Zhao,Yakai Lin,Xin Liu,Lin Wang,Hong Yao,Yuanhui Tang,Lixin Yu,Haihui Wang,Xiaolin Wang
Positively charged nanofiltration membrane has gained significant interest in magnesium and lithium separation due to its separation mechanism, especially in salt lake-based lithium industry. To obtain a high-density positive charged surface and high Li + /Mg 2+ selectivity, a novel thin-film nanocomposite (TFN) nanofiltration (NF) membrane for recovery of Li + from Mg/Li mixtures with Mg 2+ /Li + ratios of 20 was successfully prepared by using polymeric amine polyethyleneimine (PEI) and monomeric amine silane coupling agent (3-diamino-methyl-cyclohexyl triethoxysilane, DTES). Then the effect of DTES on the surface properties and performance of the prepared DTES/PEI/TMC TFN membranes were investigated. Chemical composition analysis revealed that DTES not only hydrolyzed to Si–OH and then self-polymerized to Si–O–Si, but also reacted with the self-carrying acyl chloride of 1,3,5-benzene trichloromethane (TMC). Moreover, SiO 2 nanoparticles were in-situ generated from DTES inside the PA layer with high compatibility. Due to the compatible properties with the positively charged PEI polymer, the reacted DTES was distributed uniformly in the formed TFN selective layer with no noticeable aggregation. The doping of SiO 2 into the polyamide network gave rise to the enlargement of the membrane pore size, enhanced the surface hydrophilicity, and reinforced the surface positive charges. The water flux of the DTES/PEI/TMC membrane improved from 36.9 L m −2 h −1 to 49.58 L m −2 h −1 compared to the PEI/TMC membrane. Additionally, the Mg 2+ and Li + rejection of the optimized membranes was 91.46% and −10.5%, respectively, with permeability and selectivity (S Li, Mg = 12.95) superior to that of the commercial NF membranes. Considering the commercial availability of DTES, this study not only offers a high-performance nanofiltration membrane for recovering lithium from brines but also provides a feasible strategy for industrial separation of other monovalent and divalent ions.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2014
·Vol. 2
·期 12
·1667-1672
·
IF 0
Yan-Zhi Tian,Yan-Li Li,Zhi-Fei Wang,Yong Jiang
In this paper, a DNA–PEI microcapsule with novel nuclease-responsive controlled release properties was demonstrated. This microcapsule was constructed by the self-assembly of native DNA and PEI, and can work as a dual carrier for both DNA in the capsule shell and drugs inside the capsule. The controlled release behavior of the model drug BSA–FITC was studied using fluorescence microscopy and UV spectroscopy, and the results show that the synergetic controlled release can be triggered very well by a bio-stimulus, DNA nuclease recognition capsule decomposition, as well as the pH value and salt concentration. The therapeutic effects of the drug are enhanced due to the bio-stimuli responsive properties and the synergetic release of DNA and the drug together.
研究领域:
生物医学工程
·
药物递送系统
·
分子生物学
·
材料科学
·
转化医学
✓ 已验证
DOI
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zhongyang Chu,Weizhen Li,Shiqiang Song,Weichao Yuan,Shuangbao Zhu,Wenjun Gan
It is critically desired to integrate high in-plane thermal conductivity (TC) and distinguished electric insulation for thermal conductive film in modern electronic devices. Herein, integration of high TC and electric insulation in sandwich-like BNNSs@MWCNTs/PEI (S-BNNSs@MWCNTs/PEI) composite film has been successfully achieved by layer-by-layer spin coating and hot pressing inspired by highly ordered structure of natural nacre . The covalently bonded connections between BNNSs and MWCNTs are beneficial to create more efficient heat conduction path, which can partly decrease the interfacial thermal resistance and phonon scattering. The resultant S-BNNSs@MWCNTs/PEI composite films possess a high in-plane TC of 6.88 W m −1 K −1 . Meantime, benefiting from the alternating multilayer structure, the composite films exhibit satisfactory reliable dielectric performances with flexibility, which shows great potential in ceramics-filled polymer composite TIMs.
研究领域:
材料科学
·
电子工程
✓ 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）