SusMat
·
2021
·Vol. 1
·期 4
·558-568
·
IF 0
Junyuan Xia,Jincui Gu,Peng Xiao,Chang Zhang,Luke Yan,Tao Chen
Nanofiltration technology has opened an efficient pathway to addressing the grand issue of wastewater purification. Polyethyleneimine (PEI), as a hydrophilic polymer, is a promising material to manufacture separation membranes owing to its superiority. Here, we prepared a hyperbranched PEI-based separation membrane through the supramolecular hydrogen bond interaction for wastewater purification. The amino groups in the PEI molecule were partially oxidized to the nitro groups with sodium hypochlorite (NaClO). Moreover, the PEI molecular chains can be regulated from the hyperbranched state to the internal nucleation state. Molecular dynamics simulation results further indicated the strong hydrogen bonds among the oxidized PEI (O-PEI) molecular chains and the decreased gyration radius of the O-PEI molecule due to the formation of the nitro groups. In addition, the wettability and zeta potential of O-PEI membranes can be controlled by adjusting the molecular weight and oxidation degree of the PEI molecules. Under the collective effect of size screening and charge repulsion, the O-PEI separation membrane displayed a wide range of purification capabilities for contaminations, such as dye molecules and salts. This work may offer a new strategy to fabricate hyperbranched O-PEI membranes for wastewater purification.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
SEPARATION SCIENCE AND TECHNOLOGY
·
2013
·
IF 1.164
Jiahui Shao,Shu Qin,Wenxi Li,Yiliang He
Simultaneous recovery of nickel and cobalt from aqueous solutions by complexation-ultrafiltration process with polyethylenimine (PEI) was studied. Experiments were performed as a function of polymer/metal ratio (P/M), solution pH, and ionic strength. Effects of concentration time on metal rejection and membrane flux were also studied. At optimum experimental conditions of pH 6.0 and P/M 5.0, the nickel removal efficiency reaches at 99.9% and cobalt removal efficiency goes to 96.4%. Both nickel and cobalt removal efficiencies decreased as the adding salt concentration increases. During 12 h of the ultrafiltration process, the decline of membrane flux was less than 16% and the removal efficiencies for both nickel and cobalt were kept almost constant. Diafiltration was further performed to regenerate PEI. The removal efficiencies for both metals using recycled PEI were found to be close to those with the original PEI. Results from the two-step process of complexation-UF and decomplexation-UF separation showed that it could be a promising method for simultaneous recovery of nickel and cobalt from aqueous solutions.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
NANO
·
2020
·
IF 1.566
Dan Wang,Xinfeng Xiao,Bo Han,Weiming Ni,Yu Gao,Lin Li,Jianliang Xue
A series of UiO-66-PEI materials were obtained by impregnating UiO-66 with different amounts of polyethylenimine (PEI) with UiO-66 as the basic skeleton material. The materials were used as adsorbents to remove Ni 2 + and Cu 2 + from water. The prepared UiO-66-PEI-30 had good adsorption capacity on Ni 2 + and Cu 2 + at 30% PEI. The adsorption of Ni 2 + and Cu 2 + with UiO-66-PEI-30 was further studied. The role of eluent types, elution time, concentration and volume on the effect of Cu 2 + elution was investigated. The adsorption of Ni 2 + and Cu 2 + by UiO-66-PEI-30 followed the pseudo-second-order kinetic model and Langmuir adsorption model. The maximum adsorption capacities obtained by Langmuir fitting for Ni 2 + and Cu 2 + were 11.54 mg g − 1 and 24.87 mg g − 1 , respectively. After four desorption/adsorption experiments, UiO-66-PEI-30 still showed good adsorption performance. UiO-66 impregnated with PEI was an adsorbent with adsorption potential.
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 COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Jingli Ren,Ruixia Kong,Yujie Gao,Lianbin Zhang,Jintao Zhu
In this work, we develop a simple yet robust method to fabricate a bioinspired adhesive coating based on polyethyleneimine (PEI) and tannic acid (TA) complexes, exhibiting excellent antifogging, self-cleaning, and antibacterial properties. The polyethyleneimine-tannic acid (PEI-TA) complexes coating combined with the bioinspired adhesive property from TA can be effectively and stably coated onto various substrates through a one-step deposition process , and the hydrophilicity of the coated substrates can be significantly enhanced with their water contact angle less than 10°. The bioinspired adhesive coating endows the coated substrates with outstanding antifogging and self-cleaning performance. Moreover, it is found that the PEI-TA coated safety goggles display excellent durability and antifogging capability compared to the commercial antifogging safety goggles and commercial antifogging agents coated safety goggles under 65 ℃ vapor condition for 2 h. Furthermore, the PEI-TA coatings show superior antibacterial activities for Gram-negative Escherichiak coli and Gram-positive Staphylococcus aureus . The antifogging, self-cleaning, and antibacterial coating provides widely potential application prospects in optical and medical devices .
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Peiwen Wang,Congjin Chen,Yingjie Li,Jinrou Wei,Zuqiang Huang
Lignin, as a by-product produced in the biological refining and papermaking processes, is often discarded or burned, resulting in environmental pollution and resource waste. Herein, a novel environmental-friendly ternary hybrid foams adsorbent (SLS/PEI/ZIF-8) was designed for effectively removal TC from aqueous solution. The adsorption properties of the adsorbent were systematically studied. The results show that the adsorption process for TC were fitted well by the pseudo-second-order kinetics model and the Langmuir isotherm model, respectively. The maximum Langmuir monolayer adsorption capacity of SLS/PEI/ZIF-8 for TC was calculated as 1098 mg/g at 30 °C, which was superior to most reported adsorbents. Thermodynamic analysis indicated the adsorption process for TC was spontaneous and endothermic. Moreover, the electrostatic interactions, hydrogen bonding interactions and π–π interactions were proposed as the possible adsorption mechanism. The adsorbent still maintained superior adsorption capacity for TC in ions solution, HA solution and actual water samples, and had good reusability. Therefore, it is a promising adsorbent for the removal of TC from wastewater.
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
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2013
·Vol. 160
·期 6
·D289
·
IF 2.588
X. G. Zheng,Y.-N. Shi,K. Lu
To minimize pores or voids that left after electro-healing by plain solution without additives, controllable electro-healing was investigated in pure Ni plates with a through-thickness crack in a Watts bath by adding polyethyleneimine (PEI) and saccharin. Controllable electro-healing means that the growth velocity of healing crystals from crack tips is much faster than that from sidewalls of the crack, which reduces the number of pores owing to depletion of healing solution. Rotating disk electrode (RDE) was introduced to evaluate the electrochemical behavior in crack tips and crack center. Voltammograms and galvanostatic measurements indicated that PEI exhibits a convection-dependent inhibition effect on Ni deposition. The addition of saccharin will much enhance the inhibition behavior of PEI, controllable electro-healing was achieved with the presence of both PEI and saccharin.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2017
·
IF 5.651
Yuanji Shi,Tao Zhang,Hongqiang Ren,Andrea Kruse,Ruofan Cui
An adsorbent hydrochar was synthesized from corn cobs and modified with polyethylene imine (PEI). The hydrochars before and after modification were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis. FTIR and XPS revealed that the PEI was grafted onto the hydrochar via ether and imine bonds formed with glutaraldehyde. The maximum adsorption capacities for Cr(VI) (33.663 mg/g) and Ni(II) (29.059 mg/g) on the modified hydrochars were 365% and 43.7% higher, respectively, than those on the unmodified hydrochar. A pseudo-second-order model described the adsorption of Ni(II) and Cr(VI) on all the adsorbents. The adsorption of Cr(VI) was endothermic, spontaneous, increased disorder, and obeyed the Langmuir model. By contrast, the adsorption of Ni(II) was exothermic, spontaneous, decreased disorder, and obeyed the Freundlich model. XPS confirmed that the adsorption sites and mechanisms for Ni(II) and Cr(VI) on the modified hydrochars were different.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 7
·3997-4008
·
IF 5.044
Hu Die,Zhang Tingting,Zhang Song,He Jinxin,Dong Xia
The adsorption and diffusion behavior of polyethyleneimine with different molecular weights on cotton fibers was evaluated at a typical concentration of 1 g/L in textile industry by titration and fluorescence labeling techniques. Directly observing the penetration extent of fluorescently labelled polyethyleneimine inside the pore structure of cotton fiber by fluorescent microscopy provided the underlying mechanism for the traditional titration methods. The adsorption behavior of polyethyleneimine was shown to be highly dependent on its molecular weight. Polyethyleneimine with molecular weight of 10,000 was limited to the outermost surface of the yarn, and polyethyleneimine with molecular weight of 1800 uniformly adsorbed on the single fiber with few of them diffusing inside the fiber, while polyethyleneimine with molecular weight of 600 easily penetrated into the pores throughout the fiber cell wall. Additionally, extending the time, increasing the temperature, adjusting the pH and increasing the PEI concentration can also promote the diffusion of PEI into the fiber to a certain extent. Graphic abstract The distribution of labelled PEI on the cotton yarn
研究领域:
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2014
·
IF 2.703
Shuai Han,Feng Liu,Jiang Wu,Yu Zhang,Yujie Xie,Wenyu Wu,Weisheng Liu,Qin Wang,Yu Tang
Palygorskite (Pal), a natural clay mineral, grafted by functional macromolecule polyethyleneimine (PEI) via the coupling grafting method, has further been modified by introducing both fluorescein isothiocyanate (FI) and folic acid (FA), with the aim of specifically targeting and detecting cancer cells. The formed Pal-PEI–FI–FA nanocomposite was nontoxic up to a concentration of 300 μg·mL − 1 , and further could be specially taken up by HeLa cells via FA receptor-mediated endocytosis as shown by confocal microscopy and inductively coupled plasma optical emission spectroscopy (ICP-OES) data. Therefore, it is concluded that the novel Pal-based nanocomposite has great potential for biomedical sensing, diagnosis, and therapeutics.
研究领域:
生物医学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2018
·
IF 3.789
Mei Liu,Jiao Li,Baoxin Li
Polyethylenimine (PEI) has antimicrobial activity against Gram-positive (Staphylococcus aureus, S. aureus) and Gram-negative (Escherichia coli, E. coli), bacteria but is highly cytotoxic, and the selective antimicrobial activity against S. aureus is obviously better than that against E. coli. To reduce the cytotoxicity and improve the antibacterial activity against E. coli, we modified PEI with d-mannose through nucleophilic addition between primary amine and aldehyde groups to get mannose-modified polyethylenimine copolymer particles (Man-PEI CPs). The use of mannose may provide good targeting ability toward E. coli pili. The antibacterial activity of Man-PEI CPs was investigated. Man-PEI CPs shows specific and very strong killing capability against E. coli at a concentration of 10 μg/mL, which is the highest antimicrobial efficiency compared to that of unmodified PEI (220 μg/mL). The antibacterial mechanism demonstrated that the enhancement in antibacterial activity is due to specific recognition of the mannose and destroying the cell wall of the bacteria by PEIs. Importantly, the Man-PEI CPs show less cytotoxicity and excellent biocompatibility. The results indicate that Man-PEI CPs have great potential as novel antimicrobial materials to prevent bacterial infections and provide specific applications for killing E. coli.
研究领域:
材料科学
·
微生物学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2021
·Vol. 22
·期 9
·2440-2446
·
IF 2.153
Ju Lin-Xin,Li Fan,Ning Xin,He Hong-Wei,Zhou Rong
As a natural cellulose fiber, kapok fiber is much easier to degrade due to its thin wall structure of fiber in the process of storage and use. In this work, a finishing modification was designed and developed to prevent kapok fiber from degradation. Dopamine was polymerized in situ and deposited on the surface of kapok fiber, which was operated in the mixed solvents of ethanol:water (1:1 in volume) to overcome the strong buoyancy. Polyethyleneimine (PEI) was introduced to assist dopamine polymerization and improve the load rate. An optimum dosage, 1.0 g/ l of PEI could afford the highest loading rate of 32.1% of polydopamine (PDA), and remarkably improve loading fastness. As a multi-amino polymer, PEI could reduce Ag + and chelate with metal silver (Ag). The PDA/Ag covered kapok fiber and nonwovens showed good antibacterial activity and better mechanic strength, which would be more suitable for durable oil absorption and sound absorption materials than pure kapok fiber.
研究领域:
材料科学
·
纺织工程
·
生物学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 53
·33202-33207
·
IF 3.361
Wen Wen,Zhongping Li,Xu Wang,Xiaoyan Du,Guangming Wen,Li Li
Metal nanoclusters (NCs) have recently emerged as a novel class of luminescent nanomaterials and held significant potential in analytical chemistry. In this work, novel polyethyleneimine stabilized palladium nanoclusters (PEI–Pd NCs) were synthesized by chemical reduction at 60 °C for 6 h, and used as a fluorescent nanosensor for the detection of oxytetracycline (OTC). The spectral characteristics, surface structure and morphology of the Pd NCs were studied. The selectivity and stability of the nanosensor were also investigated. The experimental results showed that the Pd NCs had good biocompatibility, stability and photobleaching resistance in aqueous solution. The fluorescence quenching effect showed a good linear relationship with the degree of fluorescence quenching of Pd NCs and OTC in the range of 25–440 nM, with a correlation coefficient of 0.99. The limit of detection (LOD) of the proposed nanosensor for OTC was calculated to be 22 nM. The mechanism of determination was thought to be an inner filter effect (IFE) between OTC and Pd NCs. Based on this, we have established a new nanosensing analysis method for detecting OTC.
研究领域:
分析化学
·
纳米材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）