Journal of CO2 Utilization
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2021
·
IF 7.132
Bowen Lu,Yongqing Xu,Zewu Zhang,Fan Wu,Xiaoshan Li,Cong Luo,Liqi Zhang
Cu-based catalysts had been widely used in CO 2 hydrogenation process for their excellent performance and high selectivity. Micron-sized Cu powder obtained by ball milling exhibited poor CO 2 activity for its large particle size and small specific surface area, limited its catalytic application. In this work, micron Cu powder was modified with CeO 2 species synthesized from different cerium precursor salts via a solution auto-combustion method to investigate CO 2 hydrogenation activity. This work revealed that CeO 2 species formed from cerium acetate precursor salt achieved excellent CO 2 performance (1.64 mol/g cat .h at 400 °C), which was 3.8 times and 6000 times higher than that from cerium nitrate salt or cerium chloride salt, respectively. Interestingly, a thick dense CeO 2 shell would be formed on micron Cu generated from cerium(III) chloride precursor salt, which inhibited CuO x reduction and had the opposite effect for RWGS reaction. In addition, the CuO x species in CeO 2 @Cu synthesized from cerium chloride salt resulted in the CH 4 selectivity. The enhancement performance of the CeO 2 @Cu prepared from cerium acetate salt and cerium nitrate salt could be attributed to the oxygen defects formed around the Cu-Ox-Ce interface area and metallic Cu in the RWGS reaction. Cerium precursor salts enhanced the structural integrity of CeO 2 @Cu and played a vital role in RWGS reaction. These results will support a new direction for exploring micron Cu powder in Cu-based catalysts for CO 2 utilization.
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SOLID STATE IONICS
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2021
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IF 3.785
Yawen He,Zhongbin Ye,Mohamad Chamas,Moulay Tahar Sougrati,Pierre-Emmanuel Lippens
The silicon based composite Si/Cu-Zn(ox)/C was prepared by ball milling from Si microparticles , Cu-Zn nanopowder heated at air and carbon black. The composite is formed by Si submicrometer particles, Cu-rich Cu x Zn, CuO , ZnO and C nanoparticles . The two oxides are electrochemically active during the first discharge, improving the nanostructuration of the composite and providing Cu nanoparticles that enhance the electronic conductivity with Cu x Zn and C. The nanostructuration helps to buffer the volume variations due to Li-Si alloying reactions during cycling. The composite is further nanostructured during the first cycles as shown by XRD and electrochemical measurements. The material was tested as anode material for Li-ion batteries, providing a reversible capacity of 800 mAh.g −1 during 100 cycles at current of 300 mA.g −1 and a good rate capability. The reversible capacity is mainly due to Li-Si alloying reactions and is stable after few cycles while the solid electrolyte interphase is stabilized after about ten cycles as shown by electrochemical impedance spectroscopy .
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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2019
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IF 4.081
Ni Xiong,Rui Bao,Jianhong Yi,Jingmei Tao,Yichun Liu,Dong Fang
Carbon Nanotubes (CNTs)/Cu-Ti composites with strong interfacial bonding were successfully prepared by Molecular Level Mixing (MLM) combined with Spark Plasma Sintering (SPS) method. The relationship between interface evolution and mechanical properties was carefully investigated by High Resolution Transmission Electron Microscopy (HRTEM). It was found that three typical transition interfaces (Ti 8 C 5 , Ti 8 C 5 +TiC, TiC) were formed between the CNTs and the Cu-Ti matrix when 0.3 wt% CNTs/Cu-Ti composite powder was sintered at 1073 K for 10min, 20min and 30min respectively. Strong interfacial bonding and well-preserved CNTs structure were simultaneously realized in the sample which was sintered at 1073 K for 10min. The interface evolution phenomenon of the Ti 8 C 5 to the TiC interface transition phase and a parallel orientation relationship ((219) Ti8C5 //(111) TiC ) were observed under a sintering time of 20 min at 1073 K. The 0.3 wt% CNTs/Cu-Ti composites sintered at 1073 K for 10 min exhibited yield strength of 368 MPa and tensile strength of 512 MPa, which were 59% and 51% higher than that of unreinforced Cu-Ti, 27% and 25% higher than that of 0.3 wt% CNTs/Cu composites without alloying. This study provides some new insights into the interfacial regulation of the CNTs/Cu composites with strong interfacial bonding and reinforcing effects.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
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2019
·Vol. 20
·期 6
·1469
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IF 4.183
Xuerong Zhou,Ling Zhao,Jie Luo,Huaqiao Tang,Min Xu,Yanyan Wang,Xiaoyu Yang,Helin Chen,Yinglun Li,Gang Ye,Fei Shi,Cheng Lv,Bo Jing
Research has shown that nano-copper (nano-Cu) can cause damage to the spleen and immune system yet their mechanisms of cytotoxicity are poorly understood. Our aim is to explore the potential immunotoxicity in the spleen of rats after nano-Cu exposure. The results of hematologic parameters, lymphocyte subsets, immunoglobulins, and histopathology indicated that copper obviously changed the immune function of the spleen. The levels of antioxidants (SOD, CAT, GSH-Px), oxidants (iNOS, NO, MDA), and anti-oxidative signalling pathway of Nrf2 (Nrf2 and HO-1) were strongly induced by nano-Cu. The expression of mRNA and protein of pro-/anti-inflammatory (IFN-γ, TNF-α, MIP-1α, MCP-1, MIF, IL-1/-2/-4/-6) cytokines were increased by nano-Cu. The expression of regulatory signal pathways, MAPKs and PI3-K/Akt were activated, which might be involved in the inflammatory responses and immunomodulatory processes of sub-acute nano-Cu exposure. The immune function of the spleen was repressed by nano-Cu induced oxidative stress and inflammation.Keywords:nano-Cu;rats;spleen injury;immune system;oxidative stress
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高影响因子
JOURNAL OF CATALYSIS
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2019
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IF 7.723
Xin Chen,Rong Chen,Xun Zhu,Qiang Liao,Yuxin Zhang,Dingding Ye,Biao Zhang,Youxu Yu,Jinwang Li
In this work, a solar responsive photocathode with the CuS/Cu 2 O/Cu cubic nanoparticles was developed to facilitate the separation of the electron/hole pairs so as to enhance the photoelectrochemical activity. The EIS and LSV results indicated the developed CuS/Cu 2 O/Cu photocathode showed better photoelectrochemical activity toward the oxygen reduction reaction than the Cu 2 O/Cu photocathode. Good stability of the developed CuS/Cu 2 O/Cu photocathode was confirmed by the photocurrent vs time measurement. Besides, the developed CuS/Cu 2 O/Cu photocathode was also assessed by incorporating it into a photocatalytic fuel cell with the lateral design for simultaneous wastewater treatment and electricity generation. It was shown that higher cell performance was achieved than the Cu 2 O/Cu photocathode. The performance of the photocatalytic fuel cell with the developed photocathode was then studied under various operating conditions. Experimental results indicated that increasing the light intensity and the Na 2 SO 4 electrolyte concentration and decreasing the liquid flow rate in the testing range could improve the cell performance. This study provides a new photocathode design for the photocatalytic fuel cell applications and other photoelectrochemical systems.
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RSC Advances
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2019
·Vol. 9
·期 14
·7786-7794
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IF 3.049
Zhuang Xu,Wenjing Lou,Gaiqing Zhao,Dongdong Zheng,Junying Hao,Xiaobo Wang
Tungsten disulfide–polydopamine–copper (WS2–PDA–Cu) nanocomposites were first prepared by a green and effective biomimetic strategy and then used as a lubricant additive in polyalkylene glycol (PAG). The biomimetic strategy is inspired by the adhesive proteins in mussels. WS2 nanosheets were decorated by uniformly dispersed Cu nanoparticles (Cu NPs). The WS2–PDA–Cu nanocomposites with good dispersion stability, showed better friction reducing and anti-wear properties than WS2, Cu NPs and WS2–Cu dispersed in PAG base oil. The average friction coefficient and wear volume were reduced by 33.56% and 97.95%, respectively, at 150 °C under a load of 100 N for the optimal concentration of 0.9 wt%. The lubrication mechanism was discussed.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
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2019
·Vol. 21
·期 2
·1-12
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IF 2.009
Xia Xiaoxiao,Li Wei,Li Song
Ionic liquids/metal-organic framework composites are recognized as promising adsorbents for CO 2 capture due to the outstanding adsorption performance, whereas their water stability, which is critical for the real application of ILs/MOF composites, has not been taken into consideration. In this work, the water stability of two ILs/Cu-BTC composites, i.e., 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF 4 ]) /Cu-BTC and 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF 6 ]) /Cu-BTC, were investigated. We found that the loading of ILs does not impose remarkable impacts on the crystalline structure of Cu-BTC upon water exposure; whereas the thermal stability and surface area of Cu-BTC were decreased by the incorporation of ILs, thereby leading to the reduced CO 2 uptake in spite of the enhanced CO 2 heat of adsorption. Furthermore, it was revealed that the decomposition of Cu-BTC occurred within the first hour of water exposure. Nevertheless, the loading of ILs retarded the decomposition of Cu-BTC according to the variations in BET surface area upon water exposure.
Graphical abstract
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Nana He,Lili Li,Panpan Wang,Junhao Zhang,Jiaqi Chen,Jie Zhao
Herein, titanium dioxide/chitosan/poly(lactide-co-caprolactone) (TiO 2 /CS/P(LLA-CL)) composite membranes with highly efficient adsorption of copper ions (Cu(II)) in aqueous solution were developed, through a facile electrospinning method. First, TiO 2 nanoparticles were ultrasonically dispersed in CS/P(LLA-CL) solution to get a uniform suspension. Afterwards, the mixture was applied for electrospinning to generate the smooth and bead-free composite membranes. The high adsorption capability of the composite membranes on Cu(II) was mainly attributed to the combination of TiO 2 nanoparticles, CS/P(LLA-CL) matrix and nanosized membrane. Among those, the TiO 2 /CS/P(LLA-CL) composite membrane with 2% TiO 2 content demonstrated the maximum adsorption capability (˜190.5 mg g −1 ) for Cu(II) from aqueous solution. Their adsorption behaviors were well conformed to pseudo-second-order kinetic model and Langmuir isotherm model. Moreover, FTIR and XPS results confirmed the existed chelation and ion exchange between the membrane and the Cu(II) during adsorption process. Due to its simplicity, effectiveness and stability in water, this type of composite membrane may serve as a promising environmentally-friendly and non-toxic adsorbent for removal of Cu(II) in aqueous.
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CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Quanfa Zhong,Qintie Lin,Runlin Huang,Hengyi Fu,Xiaofeng Zhang,Haoyu Luo,Rongbo Xiao
A nitrogen and copper codoped biochar (N-Cu/biochar) material was prepared and used to activate persulfate (PS) for tetracycline (TC) degradation. The material was characterized by SEM, FT-IR, XRD and XPS. The results showed that the N-Cu/biochar had a flaky carbon structure with urchin-like copper growing on the carbon surface, a large specific surface area of 352.43 m 2 /g that provided sufficient active sites for catalytic reaction, and abundant functional groups. Quenching experiments and electron paramagnetic resonance (EPR) experiments verified the reaction pathway mechanisms. The main free radical in the system was HO ; another possible mechanism is the nonradical pathway of electron transfer between TC and PS on the surface of the catalyst, and this electron transfer could lead to TC degradation. All the TC was removed within 120 min at a catalyst dosage of 200 mg/L, PS dosage of 0.5 mM, and pH of 7.0. Chloride and bicarbonate ions had little effect on the degradation of TC. HPLC-MS was used to investigate the main degradation intermediates and the possible transformation pathways were proposed. The toxicity of TC and its intermediates were evaluated by bioluminescence inhibition method. The high catalytic efficiency and low consumables of the N-Cu/biochar/PS system could provide a new strategy for the remediation of wastewater.
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SENSORS
·
2018
·Vol. 18
·期 7
·2151
·
IF 2.475
Fei Qu,Jingwen Li,Wenli Han,Lian Xia,Jinmao You
Both adenosine triphosphate (ATP) and glucose are important to human health, and their abnormal levels are closely related to angiocardiopathy and hypoglycaemia. Therefore, the simultaneous determination of ATP and glucose with a single test mode is highly desirable for disease diagnostics and early recognition. Herein, a new fluorescence on/off switch sensing platform is developed by carbon nanodots (CNDs) to detect ATP and glucose simultaneously. The fluorescence of CNDs can be quenched by Cu2+and hydrogen peroxide (H2O2), due to the formation of hydroxyl radicals (·OH) produced in the Cu-Fenton reaction. Based on the high affinity of Cu2+with ATP, the fluorescence of CNDs will recover effectively after adding ATP. Additionally, glucose can be efficiently catalyzed by glucose oxidase (GOx) to generate H2O2, so the platform can also be utilized to analyze glucose. Under optimum conditions, this sensing platform displays excellent sensitivity and the linear ranges are from 0.1 to 7 μM for ATP with a limit of detection (LOD) of 30.2 nM, and from 0.1 to 7 mM for glucose with a LOD 39.8 μM, respectively. Benefiting from the high sensitivity and selectivity, this sensing platform is successfully applied for simultaneous detection of ATP and glucose in human serum samples with satisfactory recoveries.Keywords:simultaneous detection;Cu-Fenton reaction;carbon nanodots;adenosine triphosphate;glucose;satisfactory recoveries
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Yimeng Song,Donghui Yang,Shengnan Yu,Xinsheng Teng,Ze Chang,Fusheng Pan,Xianhe Bu,Zhongyi Jiang,Baoyi Wang,Sheng Wang,Xingzhong Cao
Tailoring the interface between the polymer matrix and filler to probe the structure-performance relationship is one of the critical research issues in hybrid membranes. In this study, metal organic framework (MOF) incorporated hybrid membranes are fabricated with polydimethylsiloxane (PDMS) as the matrix and Cu(II) loaded UiO-67-bpydc (bpydc refers to 2,2′-bipyridine-5,5′-dicarboxylic acid) as the filler, which are utilized for removing thiophene from model gasoline. The structure-performance relationship of the resultant membranes was investigated. The flux of the hybrid membrane shows a remarkable increase while avoiding obvious loss of selectivity. The loading of Cu(II) onto UiO-67-bpydc effectively tailors the interface between the polymer matrix and filler, which enhances the membrane separation performance. This study may offer a new example for designing MOF-based hybrid membranes towards efficient molecular separation.
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JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 54
·期 6
·5136-5148
·
IF 2.993
Zou Faxing,Chen Heng,Chen Shaojun,Zhuo Haitao
Shape-memory polymers with supramolecular switch have received increasing attention. This study reports the synthesis and characterization of supramolecular shape-memory polyurethane based on Cu(II)–pyridine coordination, obtained by mixing pyridine containing polyurethane with CuCl 2 . The results show that there are strong metal–ligand coordination interactions formed between Cu(II) and the pyridine ring in a series of CuCl 2 -doped polyurethane samples. The Cu(II)–pyridine coordination plays a crucial role in the enhanced physical netpoints for outstanding shape-memory properties. Indeed, the so-synthesized CuCl 2 -doped polyurethane exhibits not only a rapid tensile shape recovery but also excellent crimp shape recovery. The CuCl 2 -doped polyurethane containing suitable metal–ligand coordination interactions shows more than 99% shape fixation and more than 95% shape recovery. Our findings promote further applications of shape-memory polymers in multiple engineering fields.
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