JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
He Zhang,Jun-Ru Liu,Guo-Hua Zhang
In this paper, excellent performance W-Cu-Ni-Fe alloys with the addition of Ni and Fe (total content: 5 wt%) were successfully prepared by low temperature liquid-phase sintering, using the raw material of ultrafine W-Cu-Ni-Fe composite powder. Ultrafine W-Cu-Ni-Fe composite powder with high sintering activity and uniform composition distribution was prepared by a two-stage reduction method consisting of carbothermal reaction and hydrogen deep deoxidation. Additions of Ni and Fe not only improved the wettability between W and Cu two phases, but also improved the bonding strength of two-phase interface. All sintered samples had higher relatively densities to ensure that the samples have great comprehensive properties. When Ni and Fe were co-added in appropriate proportions, the highest tensile strength and elongation of W-Cu-Ni-Fe alloy samples were 497 MPa and 9.12 % for the composition: W-3.5 wt%Ni-1.5 wt%Fe-25 wt%Cu, respectively. Meanwhile, with increasing Ni content from 0 wt% to 5 wt%, the compressive strength and failure strain of alloy samples increased from 1160 MPa to 2376 MPa and from 53 % to 98 %, respectively. In addition, with the enhancement of the solid solution strengthening effects of Ni and Fe on Cu matrix, the bending strength and microhardness of the alloy samples increased to 1174 MPa and 361 HV for composition: W-3.5 wt%Ni-1.5 wt%Fe-25 wt%Cu, respectively. Although the additions of Ni and Fe made the Cu matrix network structure have a uniform distribution, it led to a decrease in the electron transfer ability of the alloy, and thus, there was a decrease in electrical conductivity .
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ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Fuad Abduro Bushira,Shimeles Addisu Kitte,Yong Wang,Haijuan Li,Ping Wang,Yongdong Jin
In this study, an effective oxygen vacancy (Ov)-involved luminol-dissolved oxygen (O2) electrochemiluminescence (luminol-DO ECL) system was developed and exploited for ECL sensing applications through significant plasmon enhancement of the Ov-involved weak luminol-DO ECL signals by the combined use of Cu-doped TiO2 oxygen vacancy and a Au@SiO2 nanomembrane. The results disclosed that the ECL response of the corresponding system could be synergistically boosted, and the plausible underlying mechanism has been discussed. Furthermore, for the first time, the developed system has been successfully applied for the highly sensitive detection of alkaline phosphatase with a low limit of detection of 0.005 U/L, with an excellent linear range from 0.005 to 10 U/L, as well as good stability and reproducibility.
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ACS Applied Nano Materials
·
2021
·
IF 5.097
Sellan Premkumar,Zhouzheng Jin,Dan Liu,Devaraj Nataraj,Bhekie B. Mamba,Alex T. Kuvarega,Jianzhou Gui
Improving charge transport properties between the quantum dots (QDs) and reducing the non-radiative recombination have been attempted on silver bismuth iodide (Ag2BiI5) perovskite QDs using oleylamine–sulfide passivation. Herein, we have prepared Ag2BiI5 silver bismuth iodide QDs via a simple ligand-assisted reprecipitation method, and the samples were passivated with the oleylamine–sulfide complex. The absorption and emission profiles were red-shifted, which implies that the overall size of the QDs has increased after the passivation. An increase in the emission intensity confirmed the reduction of non-radiative recombination and an increase in excited-state carrier lifetime, as observed from the time-correlated single-photon counting-lifetime measurements. Further, the photocurrent devices were fabricated and generated high-magnitude photocurrent values in the ranges of ∼1.1 to 1.8 μA (bare Ag2BiI5) and ∼0.27 to 0.54 μA (oleylamine–sulfide-passivated Ag2BiI5) for the biasing voltages of 0.1 and 0.2 V, respectively. Surprisingly, the oleylamine–sulfide-passivated Ag2BiI5 sample exhibited a sharp rise in the photocurrent value with a high on/off ratio. In addition, the bare and oleylamine–sulfide-passivated QDs were further applied for the fluorescence detection of copper Cu(II) ions in drinking water samples for the first time.
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MATERIALS LETTERS
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2021
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IF 3.423
Zelong Wang,Dajun Hou,Jungang Yi,Ning Cai,Jia Guo
The application of polymer for thermal interface materials is limited by its low thermal conductivity. In this work, barium titanate coated Cu core–shell particles were prepared and then employed as thermal conductive fillers to reinforce epoxy matrix. The results indicate that thermal conductivity of the Cu@BaTiO 3 /epoxy composites reaches 1.09 W m -1 K −1 at 10 vol% loading, achieving 580% elevation on neat epoxy matrix. Meanwhile, the composites retain high electrical insulation (7.90 × 10 13 Ω·cm) due to the existence of insulative BaTiO 3 layer on Cu surface. This study will provide a novel insight of the design of functionalized core–shell thermal conductive fillers and construction of high-performance thermal interface materials.
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JOURNAL OF SOLID STATE CHEMISTRY
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2021
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IF 3.498
Juncheng Zhou,Yuhao Chen,Shuang Xian,Yicun Liang,Guojia Huang,Lian Wang,Xiaozhan Yang
A novel europium metal-organic frameworks (Eu-MOFs), based on 1,3,5-benzotricarboxylic acid (H 3 BTC), 4,4′-azopyridine (4,4′-AZ) and N , N -dimethyllformamide (DMF), was synthesized by the solvothermal method . The crystal structure, thermal stability, morphology and luminescent properties are characterized by the X-ray diffraction (XRD), thermogravimetry (TG), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and optical spectroscopic techniques. The Eu-MOFs display a unique luminescence quenching effect to nitrobenzene (NB) and copper (Cu 2+ ) ions. The turn-off luminescence can be induced by 210 ppm NB or by 1000 μM Cu 2+ ions. Furthermore, the high sensitivities ( K SV = 0.039 ppm −1 for NB, and K SV =0.029 μM −1 for Cu 2+ ) and low detection limits (0.656 ppm for NB, and 1.395 μM for Cu 2+ ) are obtained. The sensing mechanisms are reasonably explained based on the electron and energy transfer. The experimental results show that the Eu-MOFs can be used as a potential sensing luminescence quenching probes for NB and Cu 2+ ions.
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Catalysis Science & Technology
·
2021
·Vol. 11
·期 22
·7467-7474
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IF 6.119
Yangfan Ming,Gang Li
When Cu–TEPA (Cu2+ coordinated with tetraethylenepentamine) is used as a template in the one-pot synthesis of Cu–SSZ-13, Cu2+ will be reduced to Cu0, resulting in a too high Cu content in the product. Herein, by adding iron complexes to the precursor, the reduction of Cu2+ could be inhibited and FeCu–SSZ-13 samples with rational Cu and Fe contents were prepared by a simple one-pot strategy. Although these samples show high activity in the NH3-SCR at low temperature, their high temperature performance is poor due to the lack of strong NH3 adsorption sites such as Brønsted acid sites. Meanwhile, different iron complexes were used as iron sources to synthesize FeCu–SSZ-13, and among them the sample with sodium nitroprusside shows the highest activity. Due to the large ionic radius of K+, it is easily retained which blocks the pores, so the performance of the samples synthesized with a K-type iron source is poorer than that of their Na-type counterparts. Moreover, the activity of the catalyst synthesized with an Fe3+ source is higher than that synthesized with an Fe2+ source because the valence state of Fe sources has a great influence on the Fe chemical state in the catalysts.
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JOURNAL OF MOLECULAR LIQUIDS
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2021
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IF 6.165
Bingqiao Yang,Pengliang Huang,Qing An
A small molecular triazole derivative called AMT (3-amino-5-mercapto-1,2,4-triazole) was explored as a novel and efficient chalcopyrite depressant in the preferential flotation of chalcopyrite from molybdenite. The flotation performances were comprehensively investigated via micro-flotation tests of singe and mixed minerals with and without Cu collector. The adsorption mechanisms were determined in terms of contact angle, adsorption capacity, and zeta potential, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and DFT calculations. Single mineral flotation results illustrated that the AMT selectively depressed chalcopyrite over a wide range of pH values. Particularly, AMT was able to depress chalcopyrite even in the presence of sodium isobutyl xanthate (SIBX). The contact angle, adsorption capacity, zeta potential, and FTIR results suggested that AMT was preferentially adsorbed on chalcopyrite surface, but it barely interacted with molybdenite. XPS tests and DFT calculations demonstrated that AMT was chemically adsorbed on chalcopyrite surface through the hybridization of S (1) and N (1) 2p orbitals of AMT with the Cu (1) 3d orbital. The bonding between S (1) atom and Cu (1) was much stronger than that between N (1) and Cu (1). Thus, AMT exhibited good potential as a novel depressant due to its excellent selectivity and practicability.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Wei Liu,Taixin Liang,Jiangbo Zhang,Fei Xiao,Houhe Chen
Intermolecular energetic materials (IEMs) have become the focus of attention due to their excellent performance in combustion, ignition, energy release and sensitivity. In this paper, two IEMs were successfully designed and prepared by the self-assembly of 5-aminotetrazole (5-ATZ) and transition metal ions on the surface of ammonium perchlorate (AP) particles. The scanning electron microscope, infrared spectroscopy, powder X-ray diffraction, thermogravimetric analyses, and differential thermal analyses were employed to characterize the prepared samples. The results show that the surface of AP particles is completely covered by a uniform and dense M(5-ATZ) 4 Cl 2 (M = Cu, Co) self-assembled layer. Thermal analyses show that the high-temperature decomposition peak temperatures of AP/Cu(5-ATZ) 4 Cl 2 (10 wt%) and AP/Co(5-ATZ) 4 Cl 2 (10 wt%) are decreased by 93.3 °C and 127.1 °C compared to the case of pure AP, while the heat releases of them are increased by 539 J∙g −1 and 580 J∙g −1 . In addition, the burning rates of AP/Cu(5-ATZ) 4 Cl 2 /Al (10 wt%) and AP/Co(5-ATZ) 4 Cl 2 /Al (10 wt%) are increased by 6.8 mm∙s −1 and 7.8 mm∙s −1 compared with the case of AP/Al. Moreover, the hygroscopicity tests show that the prepared samples do not agglomerate aftter being placed in the atmosphere with a relative humidity of 79% for 66 h. This research shows considerable application prospects in improving the combustion and energy performance of solid propellants, it is also a reference for the design and preparation of other novel IEMs.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 40
·19032-19042
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IF 3.591
Chengmin Hou,Hanxiao Ma,Congjun Cao,Xiaojian Ding,Jingting Duan
The composite particles (St/Fe3O4) of starch and Fe3O4 were prepared by a co-precipitation method. Then AA and HEMA were grafted and cross-linked on St/Fe3O4 by a one-step method to obtain St/Fe3O4-g-p(AA-r-HEMA). The effects of the adsorbent dosage, pH value, initial Cu(II) concentration, time and temperature on adsorption were studied. Experiments showed that St/Fe3O4-g-p(AA-r-HEMA) showed a good adsorption performance for Cu(II), with a unit adsorption capacity of 75.5 mg g−1 and a maximum removal rate of 95.0%. The adsorption process followed the Langmuir model and the pseudo-second-order kinetic model, was dominated by chemical adsorption, and belonged to single-layer adsorption. Renewable performance studies showed that after 8 adsorption cycles, 91.2% of the first adsorption effect was still retained.
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Journal of Environmental Chemical Engineering
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2021
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IF 5.909
Yuting Hu,Shixing Wang,Libo Zhang
A novel Cu-based bisligand metal organic framework adsorbent (Cu-BMOF) was prepared by hydrothermal method using 5-methyl-2-thiophenecarboxylic acid and 4,4-azopyridine as organic linkers. The samples were analyzed by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and zeta potentiometry (Zeta). To investigate the adsorption performance of Cu-BMOF for Au(III), the effects of pH, temperature, adsorption time and initial concentration were explored. At 298 K and pH = 2, the maximum adsorption capacity of Cu-BMOF for Au(III) is 933 mg/g. Langmuir and quasi-second-order models can describe the adsorption process well. Au(III) adsorption on Cu-BMOF is a monolayer and irreversible chemisorption process. Thermodynamic studies show that the adsorption process of gold on Cu-BMOF is exothermic and spontaneous. The response surface method (RSM) was applied to optimize the adsorption efficiency. Under optimal conditions, the adsorption rate was 99.64%. X-ray photoelectron spectroscopy (XPS) results show that the adsorption mechanism of Cu-BMOF is the binding between Au (III) and the N, and S functional groups of Cu-BMOF. In addition, the affinity of Cu-BMOF for Au(III) is superior compared with that of coexisting ions in water. Cu-BMOF have promising applications in environmental protection and water purification .
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Journal of Cleaner Production
·
2021
·
IF 9.297
Huanting Hu,Kangkang Miao,Xiaolin Luo,Sifan Guo,Xueqin Yuan,Fei Pei,Huaming Qian,Guodong Feng
Effective treatment for industrial wastewater that contains high concentration of chlorophenols is urgent and indispensable for environmental governance and human health due to their nonbiodegradable, carcinogenic and cytotoxic properties. Four kinds of Cu-containing mesoporous silica materials were utilized to catalyse Fenton-like treatment of high-concentration chlorophenols wastewater (1.0 g L −1 ). All of chlorophenols in various water matrices could be oxidatively decomposed in 35 min with the catalysis of Cu-doped SBA-15. Cu-doped SBA-15 with a Cu/Si molar ratio of 0.133 had the best catalytic activity in the oxidative degradation of 4-chlorophenol with an apparent reaction rate constant of 0.170 min −1 which was 1.3–3.6 times higher than those with other Cu-containing catalysts. After 300 min reaction, total organic carbon content of 4-chlorophenol solution declined continuously to 23.8% with an advisable utilization efficiency of H 2 O 2 of 26.5%–68.4%. Electron spin resonance tests and quenching experiments demonstrated that Cu-doped SBA-15 had a selective catalytic activity in the decomposition of H 2 O 2 into hydroxyl radicals which dominated the degradation of chlorophenols in wastewater. The redox of Cu(II)/Cu(I) in Cu-doped SBA-15 occurred efficiently, which could be attributed to chemical adsorption and electron transformation of organic molecular fragments onto Lewis acidic sites formed by the incorporation of Cu 2+ ions in SBA-15. The biological toxicity of the treated 4-CP wastewater declined significantly in comparison with that of the original wastewater. Our work provided an effective way of the heterogeneous treatment of high-concentration chlorophenol wastewater.
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APPLIED CATALYSIS A-GENERAL
·
2021
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IF 5.706
Yankai Liu,Ruinian Zhou,Jianyu Qu,Feng Han,Shuai Zhang,Xingliang Xu
Upgrading carbon dioxide (CO 2 ) into valuable products is a highly promising strategy of artificial carbon cycle. In this study, a series of in situ reduced CuMgAl layered double hydroxides (R-CuMgAl-LDHs) composites were synthesized, in which Cu nanoparticles were effectively dispersed and anchored on MgAl-LDHs with formation of Cu + and Cu 0 species. The optimized R-Cu 1.5 Mg 1.5 Al 1 -LDH exhibited excellent catalytic performance for the carboxylative cyclization of 2-methyl-3-butyn-2-ol with CO 2 (turnover number of 243) under mild conditions. The layered structure of LDH stabilized the active Cu species with high dispersion, enhancing the catalytic efficiency of this carboxylative cyclization reaction. Simultaneously, the dual-activation of both CO 2 and propargylic alcohol by Cu 0 /Cu + species generated on the surface of LDH contributed significantly to the catalytic efficiency enhancement. Furthermore, R-Cu 1.5 Mg 1.5 Al 1 -LDH catalyzed the reaction of a wide range of terminal or internal propargyl alcohols with CO 2 , yielding various functionalized α-alkylene cyclic carbonates. Finally, a reasonable reaction mechanism was put forward according to the comprehensive analysis.
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