JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Shuaijun Yu,Hao Qian,Junbin Liao,Jun Dong,Lu Yu,Chunhong Liu,Jiangnan Shen
Recovery of sulfuric acid from industrial wastewater via electrodialysis (ED) has become a hot topic recently. Since the commercially used anion exchange membranes (AEM) generally lead to the severe proton leakage during ED process, the efficiency of the acid recovery was seriously affected. In this work, a series of proton blockage cross-linking AEM has been prepared by modifying poly(vinylidene fluoride- co -hexafluoropropylene) (PVDF- co -HFP) with 1-vinylimidazole, followed by crosslinking with 1,4-dibromobutane. Our investigation demonstrates that the as-prepared PVDF- co -HFP-based AEM has the observable asymmetric structure on the two sides of the AEM with a smooth and dense surface and a rough and porous surface. The asymmetric structure and the hydrophobicity of the fluorinated backbone of AEM render the improved proton blocking performance, and the increased electrical efficiency and reduced energy consumption of acid recovery. For example, the optimized AEM (AEM-0.5) exhibits the acid concentration with the values of c H + = 2.04 M (initial proton concentration: 1.0 M) in concentrate cell during 12 h-ED process at current density of 20 mA cm −2 and low energy consumption of 1.75 kw·h·kg −1 relative to the commercial NEOSEPTA® AHA and proton blockage ACM AEM. It is believed that this study can provide a guideline for designing advanced proton blocking AEMs.
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高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2019
·Vol. 34
·期 1
·e5266
·
IF 3.259
Birong Zeng,Rong Hu,Ruirui Zhou,Hong Shen,Xinyu Liu,Guorong Chen,Yiting Xu,Conghui Yuan,Weiang Luo,Lizong Dai
A metal-doped organic and inorganic hybrid polyhedral oligomeric silsesquioxanes (POSS) with a titanium atom in the POSS cage and an ethanolamine substitute group in the corner, namely MEA-Ti-POSS, was synthesized through simple condensation reaction and substitute reaction. It was blended with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) to form a kind of blending-type flame retardant system for the modification of epoxy resins. The thermal stability, flame retardancy and mechanical properties of cured epoxy resin composites were studied. Comparing with pure epoxy resin, the LOI value of EP/MEA-Ti-POSS/DOPO composites was raised from 25.2% to 32.7%, and the UL-94 grade reached V-0 level at a loading of the mixture of 5% MEA-Ti-POSS and 5% DOPO. In addition, the cone calorimetry results showed that the heat release rate, total heat release and total smoke production as well as smoke production rate were all reduced during the combustion of EP/MEA-Ti-POSS/DOPO composites. The residual char analysis revealed that carbon residues of EP/MEA-Ti-POSS/DOPO composite served as a physical protective layer to insulate the oxygen and combustible gases to reduce the ablation of the matrix. It was concluded that the mixture of MEA-Ti-POSS and DOPO not only effectively raised the thermal stability and flame retardancy of epoxy composited materials, but also improved their mechanical properties, which expanded a promising application of the metal-POSS derivatives as non-halogen additives in the flame retardant polymers.
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高影响因子
MODERN PHYSICS LETTERS B
·
2024
·
IF 1.8
Li Liu,Qifu Bao,Tiangui Zhao,Kun Liu,Detai Shi,Siyu Li,Wei Zhu,Xiaolong Li,Jianer Zhou
A series of Zn 1 − x Fe x O ( x = 0 , 0.015, 0.045, 0.075) nanoparticles were synthesized using the solution co-precipitation method, and their structural and property characteristics were investigated. X-ray diffraction (XRD) analysis revealed that all Zn 1 − x Fe x O samples exhibited a hexagonal wurtzite crystal structure with the P63mc space group. The introduction of Fe doping led to a slight lattice distortion in the samples. The morphology of the nanoparticles, including polydispersion and agglomeration, as well as the presence of the second phase ZnFe 2 O 4 , was examined by scanning electron microscope (SEM) and transmission electron microscope (TEM). UV–Vis diffuse reflectance spectroscopy demonstrated that the band gap of Zn 1 − x Fe x O lies between 3.152 and 3.163 eV. With the increase in Fe ion doping, the band gap shows a slight decreasing trend. Mössbauer spectroscopy revealed that iron ions in the nanoparticles existed in a trivalent state and exhibited two different configurations: One involved iron replacing zinc without creating a vacancy, while the other involved iron substituting zinc with a vacancy. The ferromagnetic nature of the Fe-doped samples can be attributed to the exchange interaction between two Fe 3 + ions mediated by the F-center mechanism.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Yao Huang,Shufeng Zhao,Hui Liu,Rong Chen,Lei Zhao,Shan Liu
Abiotic Fe (II) oxidation widely occurs in the natural subsurface environment and engineered dynamic processes, which possibly impacts the growth of indigenous microbes. As previously discovered, the oxidation of aqueous Fe 2+ at neutral pH effectively inactivates iron-reducing bacteria Shewanella oneidensis strain MR-1 (MR-1). Herein, the impacts of co-existing iron mineral on the oxidation of aqueous Fe 2+ and the subsequent disinfection activity on MR-1 were investigated with siderite selected as a representative iron mineral in the subsurface environment. The oxidation rate of aqueous Fe 2+ and the amount of generated OH radical increased as the content of siderite increased, while the MR-1 inactivation was alleviated. An initial concentration of 2.0 × 10 6 CFU/mL MR-1 was inactivated by about 2.7 orders of magnitude during oxidation of 0.2 mM FeSO 4 alone for 30 min, which was reduced to only about 0.6 orders of magnitude in the presence of 4.3 mM co-existing siderite. ROS scavenging results confirmed that the OH radical generated in the bulk solution was not the leading role for the inactivation of MR-1. Morphological changes of the cells observed by SEM demonstrated that the disruption of the cell membrane was alleviated by siderite, which was further supported by the XRD and FTIR spectra. The underlying mechanism was proposed to be the reduced contact time of Fe 2+ and MR-1 cells due to the accelerated oxidation. This work provides new insights into the disinfection behavior of heterogeneous Fe (II) oxidation on iron cycling bacterial in the natural environment.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Jin Song,Fenglong Wu,Yulun Lu,Xinyan Zhang
Doping as a common mean to generate defects to boost the catalytic performance of metal oxide semiconductor-based materials has aroused great interest. However, doping usually requires high temperatures and is time consuming. Herein, we report a facile strategy for the preparation of F doped CeO 2 (F–CeO 2 ) with assistance of the electrostatic attraction between F − and CeO 2 with oxygen vacancies at room temperature , then F–CeO 2 acts as superior support of metal Co nanoparticles (NPs) for efficient hydrolysis of NH 3 BH 3 under light irradiation . The activity of Co/F–CeO 2 is significantly enhanced and Co/F–CeO 2 -0.6 exhibited highest catalytic activity with TOF value 92.8 min −1 which increases 47% compared with Co/CeO 2 . Experimental and characterization results show the enhanced performance attributes to high efficiency photogenerated carrier separation and boosting adsorption capacity of H 2 O and NH 3 BH 3 over Co/F–CeO 2 due to F doped into CeO 2 crystallites . Furthermore, theory calculations further confirm that the band gap of F–CeO 2 becomes smaller and F–CeO 2 is more favorable the adsorption for H 2 O and NH 3 BH 3 than pure CeO 2 . This work offers a facile and time efficiency strategy to realize controllable element doped in metal oxide under ambient, and gives deep insights into the structure–activity relationship of catalyst between defect engineering and photocatalytic performance.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 39
·33205-33211
·
IF 3.289
Qianqian Li,Fang Yuan,Chunyun Yan,Jianjie Zhu,Jin Sun,Yijun Wang,Jun Ren,Xilin She
Germanium and phosphorus co-doped carbon nanotubes (Ge–P-CNTs) were prepared by a simple and scalable approach. The morphology and structure of the Ge–P-CNTs was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The ORR electrocatalytic performances were evaluated by exchange current density, reaction pathway selectivity, on-set potential, kinetic current density and H2O2 yields from rotating ring-disk electrode (RRDE) measurements, indicating that the co-doped GeP2C2, GeP3C and GeP4 + PC3 microstructures in Ge–P-CNTs are crucial to improving the ORR catalytic performance. In fact, the electrochemical performance enhancement results from the synergistic effects by the appropriate proportion of Ge and P atoms. The ORR catalytic synergistic effect has also been verified by calculating the work function based on density functional theory (DFT). Because of these outstanding features, it is expected that the Ge–P-CNTs materials will be a very suitable catalyst for fuel cells and metal–air batteries.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2014
·Vol. 38
·期 12
·5957-5963
·
IF 3.159
Limei Chen,Xiujuan Jiang,Xiu Wang,Li Long,Jiayao Zhang,Xiaoming Liu
A water-soluble diiron hexacarbonyl complex, [Fe2{μ-SCH2CH(OH)CH2(OH)}(CO)6] (1), was employed as a carbon monoxide releasing molecule (CO-RM). The CO release was initiated via substitution of the bound CO by amino acids. The kinetics of the decomposition of complex 1 was a first-order process with respect to both the complex and amino acids. Its rate of CO release varies with the amino acids. Six amino acids were examined – L-cysteine ethyl ester hydrochloride, alanine, γ-aminobutyric acid, L-histidine, L-proline and sodium glutamate – as CO release promoters. Among the examined promoters, sodium glutamate shows the highest efficiency in promoting CO release from complex 1. The overall CO release involves multiple steps with different mechanisms, with an initially slow CO releasing process followed by a much faster one. The duration of the slow process is solvent-dependant. In D2O and physiological saline (in D2O), this slow process lasted much longer compared to that in DMSO. Cytotoxic assessments of the systems containing glutamate and L-cysteine ethyl ester hydrochloride suggest that the examined amino acid and amino acid derivative showed stronger cytotoxicities than cysteamine.
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高影响因子
Nanoscale
·
2012
·Vol. 4
·期 24
·7832-7841
·
IF 5.914
Hongwen Huang,Liqiang Zhang,Kewei Wu,Qing Yu,Ru Chen,Hangsheng Yang,Xinsheng Peng,Zhizhen Ye
A controllable synthesis of various morphologies of CuO nanostructures with tuning by hetero-metal cations has been developed in aqueous solution at room temperature. The morphologies of CuO can be engineered from nanosheets to nanoparticles with different length ratios of the long axis to the short axis. The formation of many metal–ion complexes plays an important role in slowing the release rate of OH− and affects the reaction kinetics further. We found that the effect of hetero-metal cations on the final morphology of the CuO nanostructures was the same as that of the cooling temperature. A series of temperature-controlled experiments demonstrated this. Furthermore, among all the synthesized CuO nanostructures, the fascinating colloidal mesoporous CuO quasi-monocrystalline nanosheets prepared at 25 °C with a thickness of ca. 10 nm and large specific surface area of 80.32 m2 g−1 is investigated intensively. These CuO nanosheets demonstrate a superior catalytic activity for CO oxidation, with features of high CO conversion efficiency (47.77 mmolCO g−1CuO h−1 at 200 °C), which is close to that reported for previously investigated supported-CuO catalysts, and a low apparent activation energy Ea (53.3 kJ mol−1).
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PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 90
·86889-86903
·
IF 3.289
H. L. Pan,Q. Q. Liu,Y. H. Zhang,H. T. Wu
Wolframite structure Zn1−xCoxZrNb2O8 (x = 0, 0.02, 0.04, 0.06, 0.08, 0.10) ceramics were prepared by the conventional solid state method. The crystal structures were studied via X-ray diffraction, and lattice vibrational modes were obtained by Raman spectroscopy. It could be found that all the A-site (Zn2+/Co2+, Zr4+) and B-site (Nb5+) cations were octahedrally coordinated with oxygen anions from the diagrammatic sketch of the crystal structure. Rietveld refinement was used to analyze the crystal structure and the lattice parameters were obtained. Based on the complex chemical bond theory and lattice parameters, intrinsic factors such as the bond ionicity, lattice energy, bond energy and coefficient of thermal expansion were calculated. Based on the results, Nb–O bonds played an important role in affecting the microwave dielectric proprieties of Zn1−xCoxZrNb2O8 ceramics. Co2+ substitution would affect the crystal structure and influence the microwave dielectric properties. The tendency of the dielectric constant (εr) could be predicted by the polarizability and bond ionicity of Nb–O bonds, and the εr showed the same tendency with Raman shifts of Nb–O vibration modes. The variation of the quality factor (Qf) could be explained by the change of the lattice energy of Nb–O bonds and the full width at half maximum (FWHM) values of Nb-site Raman modes. The temperature coefficient of resonant frequency (τf) showed the same tendency with the bond energy, octahedral distortion and bond valence of Nb–O bonds, and the opposite tendency with the thermal expansion coefficient.
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高影响因子
Reaction Chemistry & Engineering
·
2020
·Vol. 6
·期 1
·112-118
·
IF 3.441
Renjie Huang,Yanxin Wang,XiXi Liu,Peng Zhou,Shiwei Jin,Zehui Zhang
The selective hydrogenation of nitro compounds into their corresponding azo compounds is challenging in organic synthesis. In this study, we have developed a facile and efficient catalytic system for the transformation of nitro compounds into azo compounds under mild conditions over a heterogeneous cobalt catalyst (Co–Nx/C-800-AT). The Co–Nx/C-800-AT catalyst was found to be highly active for the reductive-coupling of nitro compounds into azo compounds in ethanol at 110 °C and 2.5 bar H2 pressure with the addition of NaOH as an additive, affording structurally-diverse azo compounds with satisfactory yields (70.4–98.3%). The developed method demonstrated several advantages such as high catalytic activity and high selectivity with tolerance to other functional groups and high stability.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Ni Wang,Wenbin Li,Guiqiang Cao,Ruixian Duan,Jingjie Pei,Penghui Luo,Jianhua Zhang,Jingjing Wang,Xifei Li
ABSTRACT The “shuttle effect” caused by polysulfide (LiPSs) dissolution and diffusion is a great challenge for sulfur (S) cathode in lithium-sulfur batteries (LSBs). Herein, we have successfully constructed Co/CoV 2 O 6 tandem catalytic heterostructure anchored by N-doped carbon (Co/CoV 2 O 6 /NC) via an impregnation-assisted pyriaolysis method. The “adsorption-transfer-conversion” tandem catalytic mechanism for LiPSs is realized by utilizing the three behaviors of the strong chemical adsorption of CoV 2 O 6 to LiPSs, the strong conversion of Co to LiPSs, and the transport effect of CoV 2 O 6 ←Co interfacial built-in electric field to polysulfide ions. This can effectively suppress the “shuttle effect” by separating the adsorption and conversion process of LiPSs at different active sites. The tandem catalytic characteristic coupled with the interfacial Co-N and V-N bonds among Co, CoV 2 O 6 and NC, the high electrical conductivities of metal Co and NC conducting network, the hierarchical porous structure of polyhedral framework, collectively endow Co/CoV 2 O 6 /NC@S cathode with strong structural stability, weak electrochemical polarization, good electrochemical reversibility and fast electrochemical kinetics. As a result, Co/CoV 2 O 6 /NC@S cathode presents the significantly enhanced electrochemical performance with a high capacity of 558.4 mAh g -1 at 0.2 C after 100 cycles and a low-capacity decay rate of 0.123% per cycle during 300 cycles at 1 C.
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高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2014
·Vol. 30
·期 1
·150-156
·
IF 0.886
YANG Bing-Jian,WANG Hong,Li Lei,HUANG Bo-Wen,LIAO Xiao-Zhen,HE Yu-Shi,MA Zi-Feng
The development of low-cost and effective electrocatalysts for air electrodes is critical for practical applications of lithium/oxygen batteries. In the present work, phenanthroline (phen) was used as a ligand to prepare a Co(phen)2 complex. The Co(phen)2 complex
was coated on BP2000 and then heat treated at 600, 700, 800, and 900 , to obtain carbon-supported Co-N (Co-N/C) catalysts. The catalytic activities in oxygen reduction reaction/oxygen evolution reaction (ORR/OER) of the prepared catalysts were measured and compared with those of a typical
carbon-supported cobalt tetramethoxyphenylporphyrin (CoTMPP/C) catalyst. The influence of the calcination temperature on the composition and structure of the Co-N/C catalysts was investigated. Electrochemical tests showed that the Co-N/C catalysts prepared at 700 and 800 gave better performances,
comparable to that of the CoTMPP/C catalyst. The superior electrochemical performance of the prepared Co-N/C catalysts and the low cost of the phenanthroline chelating agent make Co-N/C a promising cheap catalyst for lithium/oxygen batteries.
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高影响因子
危险品化学品经营许可证（带存储）