Journal of Central South University
·
2017
·Vol. 24
·期 8
·1727-1735
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IF 0.601
Gao Zheng-cai,Li Li-qing,Li Hai-long,Chen Ruo-fei,Wang S.,Wang Yang-gang
A zeolitic imidazolate hybrid membrane (Co-IM-mIM) containing two imidazolate ligands deposited on a macroporous α-alumina support was prepared by pre-depositing and secondary growth technique. XRD, TGA and SEM characterizations demonstrate that a stable and thin, but dense and pure-phase Co-IM-mIM membrane can be obtained on the macroporous-alumina discs in Teflon-lined autoclave at 120 °C after pre-depositing by dip-coating at room temperature. No visible cracks, pinholes or other defects were observed on the membrane layer. The gas separation studies of Co-IM-mIM membrane were carried out at 25 °C and 1×10 5 Pa, showing ideal selectivity of 6.95, 5.25, 3.40 for H 2 /CO 2 , H 2 /N 2 and H 2 /CH 4 , respectively, and a permeance of 17.37× 10 −6 mol/(m 2 ·s·Pa) for H 2 . The influence of temperature and trans-membrane pressure on hydrogen separation and permeation was also carried out. The gas permeation and selectivity demonstrate that this membrane may have potential applications for efficient H 2 separation.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Dong Huang,Zhifu Liu,Yongxiang Li,Yun Liu
In this study, a colossal permittivity up to 3800 and a low dielectric loss of 0.11 at 1 kHz have been obtained from the (Li, In) co-doped ZnO ceramic [Zn (1−2x) (Li, In) x O] when x was 0.5%. Electric modulus spectroscopy and impedance analysis were used to investigate the origin of its high permittivity. Two relaxation peaks and a dielectric anomaly were observed in the temperature range of 293–363 K. According to the Debye relaxation theory, the low- and high-temperature relaxation peaks with activation energies of 0.09 eV and 0.29 eV, have been attributed to the hopping of singly and doubly charged oxygen vacancies , which are created by lithium and indium ions doping and oxygen deficiency during sintering process. After thermal treatment in an oxidizing atmosphere, the peaks related to the singly and doubly charged oxygen vacancies disappear and the permittivity reduces to ∼460 at room-temperature. From the X-ray photoelectron spectra (XPS), the concentrations of oxygen vacancies decrease after the O 2 -annealing process. The results reveal that the oxygen defects would be the main origin of the colossal permittivity of co-doped ZnO at room-temperature range.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2015
·Vol. 33
·期 1
·312-318
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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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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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JOURNAL OF MEMBRANE SCIENCE
·
2014
·
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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Journal of Materials Chemistry A
·
2013
·Vol. 1
·期 41
·12885-12892
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IF 0
Lian-Kui Wu,Ji-Ming Hu,Jian-Qing Zhang,Chu-Nan Cao
We report a novel silica co-electrodeposition route to prepare highly active nickel films. Firstly, Ni–SiO2 composite film was fabricated on a stainless steel substrate by electrodeposition, and then the SiO2 template was removed in alkaline electrolyte by consecutive cyclic voltammetry scans, leading to the formation of a porous Ni (po-Ni) matrix. The structure and morphology of the obtained films were characterized using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The highly porous property of the po-Ni matrix is believed to be quite favourable for electrochemical applications. The electrochemical properties of the po-Ni film were evaluated by cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) and steady-state polarization curves. The results showed that the porous Ni derived from the Ni–SiO2 composite film exhibits good electrochemical performance for potential use as a supercapacitor material and catalyst for water splitting.
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OPTICS COMMUNICATIONS
·
2015
·
IF 1.449
Yibing Lin,Yu Lin,Yongming Meng,Yongguang Tu,Xiaolong Zhang
SnO 2 nanoparticles were synthesized by hydrothermal method and applied to photo-electrodes of quantum dots-sensitized solar cells (QDSSCs). After sensitizing SnO 2 films via CdS quantum dots , CdSe quantum dots was decorated on the surface of CdS/SnO 2 photo-electrodes to further improve the power conversion efficiency. CdS and CdSe quantum dots were deposited by successive ionic layer absorption and reaction method (SILAR) and chemical bath deposition method (CBD) respectively. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) were used to identify the surface profile and crystal structure of SnO 2 photo-electrodes before and after deposited quantum dots. After CdSe co-sensitized process, an overall power conversion efficiency of 1.78% was obtained in CdSe/CdS/SnO 2 QDSSC, which showed 66.4% improvement than that of CdS/SnO 2 QDSSC.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Xing Jiang,Dongxu Zhou,Xueliang Huang,Weifeng Zhao,Changsheng Zhao
In this study, we provided a facile method to prepare adsorbents with high content of amino groups for bilirubin removal. Poly (glycidyl methacrylate- co -N-vinylpyrrolidone) particle adsorbents were prepared through free radical solution copolymerization followed by a phase inversion technique. Amino groups were further introduced onto the particles by grafting 1,6-hexanediamine molecules. The porosity and specific surface area of the functional particles were 92.9% and 11.8 m 2 /g, respectively. Flourier transform infrared spectroscopy and elemental analysis confirmed the successful functionalization of polymeric particles. The cross-linker content and N-vinylpyrrolidone ratios had significant influence on the pore structure of the polymeric particles, as observed by scanning electron microscopy. Batch adsorption experiments were performed to verify bilirubin adsorption behavior of the particles, and a particle column was fabricated to further study the bilirubin removal. The particles exhibited good adsorption capacity of bilirubin without procoagulant activity , and had great potential to be used in hemoperfusion. The study opens a new route to fabricate functional polymer adsorbents.
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PubMed
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
·
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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OPTICAL MATERIALS
·
2017
·
IF 2.238
Qiang Liu,Zhengfa Dai,Dariusz Hreniak,Shanshan Li,Wenbin Liu,Wei Wang,Wei Luo,Chaoyu Li,Jiawei Dai,Haohong Chen,Huamin Kou,Yun Shi,Yubai Pan,Jiang Li
Ytterbium doped scandium oxide (Yb:Sc 2 O 3 ) nano-powders were synthesized by a co-precipitation method. Ammonium hydrogen carbonate (NH 4 HCO 3 ) and ammonia sulfate ((NH 4 ) 2 SO 4 ) were used in the precipitation process as the precipitant and dispersing agent, respectively. Structural properties and morphology of the precursor and nano-powders were investigated by BET, XRD , and SEM measurements. Ultra-fine and low agglomerated 5 at%Yb:Sc 2 O 3 powders with the average particle size of 86 nm were obtained after calcination of the precipitate at 1100 °C for 5 h, that was found to be the optimal temperature for preparation of 5 at%Sc 2 O 3 powders for further sintering. 5 at%Yb:Sc 2 O 3 transparent ceramics with in-line transmittance of 73.9% at 1100 nm and average grain size of 182 μm were fabricated by vacuum sintering of the optimal powder at 1850 °C for 10 h. The microstructure, the spectroscopic properties and the gain characteristics of obtained 5 at%Yb:Sc 2 O 3 ceramics were also studied and discussed.
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JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Xinru Li,Jiale Li,Zhichao Liu,Can Liu,Yafei Guo,Tianlong Deng
The effective removal of strontium (Sr) from radioactive wastewater is essential for human health and ecological sustainability. However, due to the existence of a large number of coexisting ions, the selective removal of Sr 2+ from it remains a significant challenge. Herein, three novel metal-doped sodium vanadosilicates were developed by structural regulation. It was found that Co-doping can not only significantly reduce the dissolution loss of vanadosilicate (NaVOSi) from the adsorbent in extreme environments by adjusting the orbital energy distribution, energy band structure, bond length, and bond energy of sodium vanadosilicate crystals, but also further enhance the adsorption performance by reducing its zeta potentials and agglomeration phenomenon. The maximum adsorption capacity of the developed adsorbent (Co-NaVOSi) was up to 319.10 mg·g −1 within 5 min. When applied to Sr 2+ removal from simulated wastewater, the distribution coefficients of Sr 2+ reached 2943.15 mL·g −1 , and the separation coefficients between Sr 2+ and coexisting ions were above 64. DFT calculations further revealed the highly selective removal mechanism of Sr 2+ from wastewater. In addition, NaNO 3 was proved to be an efficient eluent. The excellent properties above make NaVOSi an excellent candidate for effectively removing Sr 2+ from wastewater.
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