SEPARATION AND PURIFICATION TECHNOLOGY
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2018
·
IF 3.927
Xiao He,Ayang Zhou,Chang Shi,Jinli Zhang,Wei Li
A co-crosslinked poly(ether imide) (PEI) material with excellent organic solvent resistance was synthesized using mixed amines of aliphatic ethylenediamine (EDA) and aromatic p-xylylenediamine (XDA), on which the organic solvent nanofiltration (NF) membrane was prepared via the interfacial polymerization between the monomer 1,2,4,5-benzene tetracarbonyl chloride (BTC) and the amine terminals on the co-crosslinked PEI. Structural characterizations indicate that the EDA-XDA co-crosslinking is an effective pathway to modulate the species and the amount of amine terminals on the surfaces, which can in turn affect the toplayer thickness and the surface roughness of the synthesized NF membrane. The results illustrate that the NF membrane prepared on the EDA-XDA (1:1) co-crosslinked PEI (c-P/1E1X) possesses superior separation performance and stability for N,N-dimethylformamide (DMF) solution. Further, the superior solvent resistant NF membrane gly-NF-c-P/1E1X-XDA was synthesized through an additional quick patching-like IP using XDA, with the aid of ethylene glycol filling inside the intermediate pores. The membrane gly-NF-c-P/1E1X-XDA shows the DMF permeance of 6.1 L m −2 h −1 MPa −1 and the Rose Bengal (RB) rejection about 89%, and for a 5 g/L ceftazidime antibiotic DMF solution, the permeance is 4.6 L m −2 h −1 MPa −1 and the ceftazidime rejection is 81%, which is promising to be applied for the recovery of heat sensitivity ceftazidime in DMF solution.
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高影响因子
Materials
·
2018
·Vol. 11
·期 8
·1468
·
IF 2.467
Yun Gu,Le-Qing Fan,Jian-Ling Huang,Cheng-Long Geng,Jian-Ming Lin,Miao-Liang Huang,Yun-Fang Huang,Ji-Huai Wu
Co@NiSe2electrode materials were synthesized via a simple hydrothermal method by using nickel foam in situ as the backbone and subsequently characterized by scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and a specific surface area analyzer. Results show that the Co@NiSe2electrode exhibits a nanowire structure and grows uniformly on the nickel foam base. These features make the electrode show a relatively high specific surface area and electrical conductivity, and thus exhibit excellent electrochemical performance. The obtained electrode has a high specific capacitance of 3167.6 F·g−1at a current density of 1 A·g−1. To enlarge the potential window and increase the energy density, an asymmetric supercapacitor was assembled by using a Co@NiSe2electrode and activated carbon acting as positive and negative electrodes, respectively. The prepared asymmetrical supercapacitor functions stably under the potential window of 0–1.6 V. The asymmetric supercapacitor can deliver a high energy density of 50.0 Wh·kg−1at a power density of 779.0 W·kg−1. Moreover, the prepared asymmetric supercapacitor exhibits a good rate performance and cycle stability.Keywords:Co-doped NiSe2;nanowire;hydrothermal method;pseudocapacitance;asymmetric supercapacitors
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2018
·Vol. 26
·期 33
·33847-33855
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IF 2.8
Wang He-xuan,Zhu Li-nan,Guo Fu-qiao
Atrazine, one of the most widespread herbicides in the world, is considered as an environmental estrogen and has potential carcinogenicity. In this study, atrazine was degraded on boron-fluorine co-doped TiO 2 nanotube arrays (B, F-TiO 2 NTAs), which had similar morphology with the pristine TiO 2 NTAs. The structure and morphology of TiO 2 nanotube samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and UV-visible diffuse reflectance spectroscopy (DRS). It showed that the decoration of fluorine and boron made both the absorption in the visible region enhanced and the band edge absorption shifted. The efficiency of atrazine degradation by B, F-TiO 2 NTAs through photoelectrocatalysis was investigated by current, solution pH, and electrolyte concentration, respectively. The atrazine removal rate reached 76% through photoelectrocatalytic reaction by B, F-TiO 2 NTAs, which was 46% higher than that under the photocatalysis process. Moreover, the maximum degradation rate was achieved at pH of 6 in 0.01 M of Na 2 SO 4 electrolyte solution under a current of 0.02 A and visible light for 2 h in the presence of B, F-TiO 2 NTAs. These results showed that B, F-TiO 2 NTAs exhibit remarkable photoelectrocatalytic activity in degradation of atrazine.
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高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
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2019
·Vol. 17
·期 1
·1-12
·
IF 5.345
Zhao Bin,Zhao Penghe,Jin Zhaokui,Fan Mingjian,Meng Jin,He Qianjun
Background To improve the outcome of cancer treatment, the combination of multiple therapy models has proved to be effective and promising. Gas therapy (GT) and chemodynamic therapy (CDT), mainly targeting the mitochondrion and nucleus, respectively, are two emerging strategy for anti-cancer. The development of novel nanomedicine for integrating these new therapy models is greatly significant and highly desired. Methods A new nanomedicine is programmed by successive encapsulation of MnO 2 nanoparticles and iron carbonyl (FeCO) into mesoporous silica nanoparticle. By decoding the nanomedicine, acidity in the lysosome drives MnO 2 to generate ROS, ·OH among which further triggers the decomposition of FeCO into CO, realizing the effective combination of chemodynamic therapy with gas therapy for the first time. Results Acidity in the TEM drives MnO 2 to generate ROS, ∙OH among which further triggers the decomposition of FeCO into CO, realizing the effective combination of CDT and CDGT. The co-released ROS and CO do damage to DNA and mitochondria of various cancer cells, respectively. The mitochondrial damage can effectively cut off the ATP source required for DNA repair, causing a synergetic anti-cancer effect in vitro and in vivo. Conclusions The combination of CDT and CDGT causing a synergetic anti-cancer effect in vitro and in vivo. The proposed therapy concept and nanomedicine designing strategy might open a new window for engineering high-performance anti-cancer nanomedicine.
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高影响因子
MICROCHEMICAL JOURNAL
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2018
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IF 2.746
Bingru Liu,Xiaohua Li,Sumin Liu,Xu Hun
In this work, a chemiluminescence (CL) aptasensor was designed for detection of microcystin-RR (MC-RR) by introducing Cu/Co nanorods acting as CL catalyzer. Cu/Co nanorods were firstly synthesized throughout a hydrothermal method . Then the thiolated MC-RR aptamer was immobilized on the surface of Cu/Co nanorods, which was employed for recognizing of MC-RR target. In the presence of MC-RR, the conformational change of MC-RR aptamer was happened via recognizing between MC-RR and its aptamer. The luminol CL was catalyzed by Cu/Co nanorods that influenced by conformational change of MC-RR aptamer. The formed MC-RR/aptamer composite prevented the diffusion channel of luminol substrate toward the Cu/Co nanorods surface and restrained the Cu/Co nanorods catalyzing luminol CL. And the intensity of CL depended on the concentration of MC-RR. Under optimal condition, the CL aptasensor had a linear range in 0.1 to 70 nM and a low detection limit of 3.3 × 10 −11 M for MC-RR. This study provided a significant method for MC-RR detection in real samples with excellent selectivity.
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高影响因子
JOURNAL OF FOOD SCIENCE
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2018
·Vol. 84
·期 1
·111-120
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IF 2.018
Weijun Chen,Mingming Zou,Xiaobin Ma,Ruiling Lv,Tian Ding,Donghong Liu
Although different delivery systems have been developed to overcome the limits of Epigallocatechin-3-gallate (EGCG) and quercetin in food application, none have referred to their simultaneous encapsulation. In this study, these two polyphenols were successfully co-loaded into liposomes. Under the optimal conditions (lecithin-total polyphenols ratio 25:1, lecithin-cholesterol ratio 6:1, lecithin-Tween 80 ratio 8:1 and ultrasonic time 2 min), the mean size, polydispersity index (PDI) and zeta potential of liposomes were 111.10 ± 0.52 nm, 0.259 ± 0.006 and –19.83 ± 0.45 mV, with an encapsulation efficiency of 64.05 ± 1.56% and 61.73 ± 2.55% for EGCG and quercetin, respectively. After 30-day storage, an increase of 4.05% was observed in the mean size with no significant change ( P ≥ 0.05) in the PDI and zeta potential. Moreover, 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay revealed a synergistic antioxidant effect of the two compounds in liposomal system. These results demonstrated that co-encapsulation of EGCG and quercetin enhances their effectiveness. Practical Application EGCG and quercetin are natural polyphenols abound in the human diet with diverse biological activities. These two polyphenols were successfully co-encapsulated into a homogeneous and stable liposomal system. Interestingly, a synergistic antioxidant effect of the two polyphenols was observed due to co-encapsulation. This indicated that the simultaneous delivery of EGCG and quercetin was an attractive approach to improve their functionality for expanding their application in food, cosmetic and pharmaceutical industries.
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高影响因子
ELECTROCHIMICA ACTA
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2018
·
IF 5.116
Jing Chen,Huanming Wei,Haijun Chen,Wenhao Yao,Hualin Lin,Sheng Han
The N/P co-doped hierarchical porous carbon materials are synthesized by SiO 2 -template approach following potassium phosphate activation. Polyvinylidene fluoride is used as the carbon source, melamine as the nitrogen source and potassium phosphate as the phosphorus source and activator. The obtained porous carbon materials exhibit a hierarchical pore structure (∼0.6 and ∼4 nm), a large specific surface area (1431 m 2 g −1 ) and a high nitrogen and phosphorus content. These predominant characteristics enable the CNP-5-800 sample to exhibit a superior specific capacitance of 337 F g -1 at 0.5 A g −1 and outstanding cycling stability of 97.8% retention after 10000 cycles in a three-electrode system. Even in the two-electrode system (an all-solid-state symmetric capacitor), this kind of materials still can deliver an energy density of 23.1 W h kg −1 to 12.4 W h kg −1 at power densities of 720.4 W kg −1 to 13950 W kg −1 , respectively, and a cycling property of 98.7% maintenance after 5000 cycles. Therefore, the practicable synthetic method and excellent electrochemical performance make CNP- x - y materials a potential candidate in supercapacitor application.
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高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
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2015
·Vol. 33
·期 1
·312-318
·
IF 1.166
Wang Ye,Li Guobing,Chen Song,Si Rongshuang,Fan Jiangyang
Monodisperse micron-size poly(styrene-co-divinylbenzene) (PST-DVB) microspheres were successfully prepared by vibration dispersion. A vibrator was used to generate a controlled vibration to jet from a single nozzle of 200 µm to produce uniform droplets. The effects of variations in selected process parameters upon the droplets formation and the diameter of the microspheres were investigated. It was demonstrated that changes in the velocity of oil phase, drive frequency and destabilization amplitude have significant effects on the formation of uniform droplets and the average diameter of the microspheres. Rational polynomial regression equations of the above parameters were established. Based on these equations, we could calculate the operation conditions to produce uniform droplets with the desirable diameter.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2014
·
IF 4.908
Hongyan Yao,Yunhe Zhang,Yu Liu,Kaiyuan You,Ningning Song,Baijun Liu,Shaowei Guan
A series of pendant-group cross-linkable sulfonated co-polyimides (SPIs) with high degree of sulfonation were synthesized via a one-pot poly-condensation reaction from 1,3-bis(2-trifluoromethyl-4-aminophenoxy)-5-(2,3,5,6-tetrafluoro-4-vinylphenoxy)benzene (6FTFPB), 1,4-bis(4-amino-2-trifluoromethylphenoxy)benzene (6FAPB), 4,4′-diamindodiphenyl ether-2,2′-disulfonic acid (ODADS) and 1,4,5,8-naphthalene tetracarboxylic dianhydride (NTDA). Tough and flexible membranes were obtained from the SPIs by a solvent casting method. The cross-linking reaction of the pendant tetrafluorostyrol groups in the SPIs was performed at 260 °C. During the thermal treatment, no loss of the sulfonic acid groups was observed. The performance of the membranes was significantly enhanced after curing reaction. For instance, the proton conductivity, water uptake, swelling ratio and methanol permeability of the Cured-SPI-20 at room temperature were 85 mS cm −1 , 33.3%, 8.9% and 4.93×10 −7 cm 2 s −1 , respectively. Moreover, the cross-linked membranes also exhibited improved chemical resistance, oxidative stability and mechanical property. This investigation demonstrates that the pendant cross-linked polyimide membranes with high degree of sulfonation may be promising for proton exchange membrane fuel cell technology.
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高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 3
·期 6
·2978-2984
·
IF 0
Xiang-Jun Huang,Yi-Guo Tang,Long-Fei Yang,Ping Chen,Qing-Sheng Wu,Zhen Pan
An excellent CMK3/graphene-N-Co (CMK3/G-N-Co) catalytic system was firstly prepared by a simple procedure. It shows excellent catalytic ability in alkaline media for the oxygen reduction reaction (ORR) and the half-peak potential is only 27 mV less than that of the commercial 20% Pt/C catalyst. The product revealed superior stability and tolerance to methanol poisoning effects compared to the commercial 20% Pt/C catalyst. The excellent performance is probably attributed to the doping of the nitrogen and cobalt elements in the CMK3/G, formation of a three-dimensional nanoporous network structure by combining graphene with CMK3 and the promoted charge transfer across the carbon–Co interface and conductivity of the nanocomposite. Since graphene oxide (GO) and CMK3 are commercially available materials, the CMK3/G-N-Co catalytic system for the ORR is a promising alternative to Pt in the practical application of fuel cells. The product may also have potential applications in the fields of metal–air batteries, lithium-ion batteries, supercapacitors, sensors and so on.
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SYNTHETIC METALS
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2014
·
IF 2.222
Ting Zhou,Yong Qin,Juan Xu,Yongxin Tao,Mohong Lu,Yong Kong
A simple method to synthesize Zn 2+ doped poly(aniline- co - m -aminophenol) (PANMA), Zn-PANMA, for supercapacitors is reported. Capacitive behaviors of the copolymer based supercapacitor in 1 M H 2 SO 4 electrolyte were examined by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and galvanostatic charge/discharge. The morphological characteristics of Zn-PANMA and PANMA doped with Fe 3+ and Cu 2+ were investigated by field emission scanning microscopy (FESEM), explaining the different capacitive behaviors of these transition metal ions doped PANMA. A specific capacitance of Zn-PANMA as high as 631 F g −1 was achieved at a current density of 0.5 A g −1 , due to the enhancement of the electrochemical properties of the copolymer by Zn 2+ doping. Moreover, the specific capacitance still remained 71.7% after cycling for 800 times, exhibiting a good cycling performance and structure stability of Zn-PANMA.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2014
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IF 4.908
Yan Lv,Hao-Cheng Yang,Hong-Qing Liang,Ling-Shu Wan,Zhi-Kang Xu
Novel composite nanofiltration membranes (NFMs) were simply fabricated via co-deposition of mussel-inspired polydopamine (PDA) and polyetheylenimine (PEI) followed by glutaraldehyde (GA) crosslinking. A uniform, robust and defect-free selective layer was generated on the hydrolyzed polyacrylonitrile (HPAN) ultrafiltration membrane substrate, endowing the composite NFMs with high separation performance for multivalent ions. Zeta potential measurements indicate these NFMs are slightly positively charged, resulting in a salts rejection sequence of MgCl 2 >CaCl 2 >MgSO 4 >Na 2 SO 4 >NaCl at pH 5.5. The nanofiltration performance can be tuned by changing the co-deposition time and the mass ratio of dopamine/PEI. A mass ratio of 2/2 with 4 h co-deposition is the optimum protocol for the membrane performances including surface hydrophilicity, water flux and salt rejection. Moreover, the composite NFMs show a good structural stability for immersing in ethanol or for long-term nanofiltration process.
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高影响因子
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