CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Zhiqiang Zhang,Yongpeng Xu,Wenxin Shi,Wei Wang,Ruijun Zhang,Xian Bao,Bing Zhang,Li Li,Fuyi Cui
The Pd–Cu/γAl 2 O 3 catalysts were prepared by impregnation method and introduced into the cathode chamber of a divided electrochemical denitrification cell with two graphite plates as the cathode and anode, to enhance the nitrate removal efficiency and N 2 selectivity. The Pd–Cu/γAl 2 O 3 catalysts were characterized by transmission electron microscope (TEM), X-ray diffraction (XRD), specific surface area measurements (BET) and inductively coupled plasma-atomic emission spectrometry (ICP-AES). In the rationally designed electrochemical-catalytic (ECC) system, the as-prepared catalyst could significantly enhance the nitrate degradation rate to 1.08 mg/L at current density of 10 mA/cm 2 , which was approx. 2.5 times compared with the electrochemical (EC) system without catalysts adding in. Additionally, a higher nitrogen selectivity of 80.37% was obtained under the same experiment condition. The improved performances were likely due to the presence of a catalytic reduction reaction of nitrate with the appropriate amount of hydrogen generated by electrolysis as reductant. Significantly, the current efficiency was calculated and enhanced value of 20–40% (depended on current density) was obtained in the ECC process with a catalyst content of 1.0 g/L.
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JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 8
·4088-4095
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IF 2.302
Zhao Xiong-wei,Zang Chong-guang,Ma Qing-kun,Wen Yu-quan,Jiao Qing-jie
In this paper, (3-mercaptopropyl)trimethoxysilane (MPTS)- and copper-coated carbon fiber (M–Cu-CF) was obtained by electroless plating method. The M–Cu-CF was evaluated by FTIR, XRD, TGA, and SEM. It was found that the MPTS and Cu were coated on the fiber surface successfully. The M–Cu-CF was utilized as a conductive filler in silicone rubber (SR) for thermal and electrical conductivity applications and exhibited good dispersion and compatibility with the matrix. The effect of M–Cu-CF content on the thermal conductivity and volume resistivity of silicone rubber composites was investigated. The results showed that the thermal conductivity of the M–Cu-CF/SR composites reached 1.99 W (m K) −1 with only 4.0 wt% filler loading, approximately 2.10 times higher than that of raw-CF/SR composites at the same loading. And with the increase of M–Cu-CF loading, the least volume resistivity of M–Cu-CF/SR composites was 3.5 × 10 3 Ω cm.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Lifang Zhang,Peng Dou,Wenjing Wang,Jiao Zheng,Xinhua Xu
The novel Sn-Cu nanotubes enveloped in three-dimensional (3D) hierarchical polyaniline (PANI) hydrogel (Sn-Cu/PANI) were successfully prepared as a high performance anode for lithium-ion battery. The binder-free electrode exhibits reversible capacity of 548 mA h g −1 after 500 cycles and admirable rate capacity even up to 5000 mA g −1 . The exceptional electrochemical performance of Sn-Cu/PANI hydrogel could be attributed to the unique structure: (1) The inactive Cu matrix in binary Sn-Cu compounds and the tubular construction conduce to relieve the volume swing; The high porosity originated from galvanic replacement reaction accelerates ions transmission, which contributes to rapid charging and discharging. (2) The 3D porous PANI framework offers a continuous electron and lithium ions transport network among the whole electrode; the hierarchical PANI serves as mechanical support to accommodate the stress related to the large volume change of Sn-Cu nanotubes, thus reducing the risk of electrode pulverization.
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DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 19
·6425-6432
·
IF 4.029
Yuling Liu,Qingsheng Wu,Yaping Zhao
1D Ag3PO4-NPs/Cu-NWs have been constructed to enhance visible-light-driven photocatalytic activity via biomimetic synthesis. Cu nanowires (NWs) were synthesized by a facile hydrothermal method. During the process of biomimetic synthesis, the porous PTFE film, which can mimic the transport process of cell membranes, plays an important role in controlling the transport speed of silver ions (Ag+) to decrease the reaction speed. Thus inhibition of the replacement reaction of Ag+/Cu and the uniform growth of Ag3PO4 nanoparticles (NPs) with a diameter of about 10 nm on Cu-NWs can be realized simultaneously. The diameter of Ag3PO4-NPs/Cu-NW is about 70 nm. Owing to the high electron transport of single crystal Cu-NWs, the free electrons in Ag3PO4 are transferred out to promote photogenerated electron–hole pair separation. The stability of Ag3PO4 NPs of the Ag3PO4-NPs/Cu-NWs was improved and the photodecomposition no longer occurred. Meanwhile, the band-gap of Ag3PO4 decreased to 2.07 eV after being coated on Cu-NWs and expanded the absorption scope of visible-light. In addition, the active species-trapping experiments indicated that the holes and ˙O2− play important roles in the photocatalytic reactions. The novel Ag3PO4-NPs/Cu-NWs were used for the degradation of ciprofloxacin (CPFX) for the first time and showed high photocatalytic degradation performance. After visible-light irradiation for 15 min, the degradation rates of CPFX with pure Ag3PO4 NPs and AC0.3 as catalysts were about 27% and 53%. In the end, the degradation efficiency of Ag3PO4-NPs/Cu-NWs was 6.07 times that of the pure Ag3PO4 NPs.
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PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 11
·6605-6614
·
IF 3.108
Ce Gao,Qingda An,Zuoyi Xiao,Shangru Zhai
Nowadays, processing of ultra-low sulfur fuel oil has been a hot topic of research all over the world; hence, an efficient adsorption process to tackle this issue is eliciting increasing attention. However, the preparation of high-performance adsorbents is still a challenge. Herein, zirconium-substituted mesoporous SBA-15 with highly dispersed active Cu(I) species has been successfully synthesized by our group at 493 K via a mild vapor-reduction method. The as-prepared material was characterized by powder X-ray diffraction (XRD), nitrogen adsorption and desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV-vis diffuse reflectance (DRUV) spectroscopy. All characterization methods demonstrated that the Cu(I) species were highly dispersed in an ordered mesoporous framework with short channels rather than piled on the surface. The as-prepared materials also exhibited an excellent adsorption capacity for thiophene (up to 29.86 mg g−1 at 323 K). Pseudo-second-order kinetics model and Freundlich isotherm can well describe the adsorption kinetics and isotherm data, respectively. More remarkably, an ultrasound-assisted treatment can be effectively employed to regenerate adsorbent, with only a slight reduction in the adsorption capacity after five cycles.
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ENERGY & FUELS
·
2017
·
IF 3.091
Rong Deng,Yongli Sun,Hanrong Bi,Haozhen Dou,Huawei Yang,Baoyu Wang,Wenjun Tao,Bin Jiang
In the petrochemical industry, it is critical to separate the light olefins/paraffins mixtures via an efficient and economic method. In this work, a series of deep eutectic solvents (DESs) (choline chloride (ChCl)-glycerol (G), ChCl-ethylene glycol (EG), 1-butyl-3-methylimidazolium chloride ([Bmim][Cl])-G, and [Bmim][Cl]-EG) dissolving CuCl were used as novel membrane liquids to fabricate supported liquid membranes (SLMs) for the C2H4/C2H6 mixture separation. Interactions based on a hydrogen bond network in different DESs were characterized by time-of-flight mass spectroscopy (TOF-MS), nuclear magnetic resonance (1H NMR), and Fourier transform infrared (FT-IR) spectroscopy. Moreover, by absorption experiments, the Cu+ activity was quantitatively described based on a first-order equilibrium model. The effects of DESs species, CuCl concentration, transmembrane pressure, temperature, and time on separation performances were investigated by C2H4/C2H6 mixture permeation experiments. CuCl/ChCl-EG-based SLMs possessed good permeability and comparable permslectivity, as well as good long-term stability, surpassing the reported polymeric membrane upper bound. Systemic study demonstrated that the strength of the hydrogen bond networks in DESs could be tailored by optimizing the combinations of the HBAs and HBDs, and eventually improved the separation performances of the CuCl/DES-based SLMs.
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Inorganic Chemistry Frontiers
·
2017
·Vol. 5
·期 1
·258-265
·
IF 4.036
Lili Tan,Yanhong Liu,Baodong Mao,Bifu Luo,Guan Gong,Yuanzhi Hong,Biyi Chen,Weidong Shi
The development of single-component photocatalysts with narrow bandgaps (2.0–3.0 eV) has been one of the most important goals for photocatalytic H2 production, for which I–III–VI multinary sulfides play an important role due to their widely tunable composition-dependent bandgap. However, simultaneous bandgap narrowing and photocatalytic activity enhancement in the I–III–VI sulfides are often difficult to achieve due to increased defect states. Here, a series of Cu–In–Zn–S quantum dots (QDs) were synthesized by a facile hydrothermal method focusing on a more profound understanding of bandgap tuning and the subsequent effect on the photocatalytic process by controlling the Cu content. The bandgap of the QDs can be effectively tuned from 2.90 eV to 1.98 eV with an increasing Cu : In ratio from 0.05 : 10 to 2.5 : 10 and a color change from light yellow to dark red. The QDs show photocatalytic H2 production activity even without any cocatalyst, but it quickly starts to decrease with the Cu/In ratio over 0.1 : 10 (bandgap of 2.59 eV), which highly limits the potential for visible light photocatalysis. Interestingly, Pt-loading effectively enhanced not only the tolerance of Cu incorporation, but also enabled a high H2 production activity even with further bandgap narrowing down to ∼2 eV. The best photocatalytic performance of 456.4 μmol h−1 g−1 was achieved for the Cu : In : Zn ratio of 1 : 10 : 5 with a bandgap of 2.27 eV. This increased tolerance of Cu content may result from a combined effect of charge separation by Pt as the cocatalyst that alleviated the Cu-induced charge recombination. The enhanced charge separation was proved by the photoluminescence quenching of the QDs with the cocatalyst. Electrochemical impedance spectroscopy was further used to study the charge separation properties of this photocatalytic system. This is the first observation of the cocatalyst-enhanced tolerance of Cu resulting from the competition of cocatalyst-induced charge separation and defect-induced charge recombination in multinary sulfides, which provides an interesting view and design guideline for the development of narrow bandgap photocatalysts.
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Energy & Environmental Science
·
2016
·Vol. 9
·期 12
·3736-3745
·
IF 25.427
Haihua Wu,Haobo Li,Xinfei Zhao,Qingfei Liu,Jing Wang,Jianping Xiao,Songhai Xie,Rui Si,Fan Yang,Shu Miao,Xiaoguang Guo,Guoxiong Wang,Xinhe Bao
A coordinatively unsaturated copper–nitrogen architecture in copper metalloenzymes is essential for its capability to catalyze the oxygen reduction reaction (ORR). However, the stabilization of analogous active sites in realistic catalysts remains a key challenge. Herein, we report a facile route to synthesize highly doped and exposed copper(I)–nitrogen (Cu(I)–N) active sites within graphene (Cu–N©C) by pyrolysis of coordinatively saturated copper phthalocyanine, which is inert for the ORR, together with dicyandiamide. Cu(I)–N is identified as the active site for catalyzing the ORR by combining physicochemical and electrochemical studies, as well as density function theory calculations. The graphene matrix could stabilize the high density of Cu(I)–N active sites with a copper loading higher than 8.5 wt%, while acting as the electron-conducting path. The ORR activity increases with the specific surface area of the Cu–N©C catalysts due to more exposed Cu(I)–N active sites. The optimum Cu–N©C catalyst demonstrates a high ORR activity and stability, as well as an excellent performance and stability in zinc–air batteries with ultralow catalyst loading.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2012
·
IF 0.826
Huiling CHEN,Shuanjin WANG,Min XIAO,Dongmei HAN,Yixin LU,Yuezhong MENG
The 0.4 nm molecular sieve supported Cu-Ni bimetal catalysts for direct synthesis of dimethyl carbonate (DMC) from CO 2 and CH 3 OH were prepared and investigated. The synthesized catalysts were fully characterized by BET, XRD (X-ray diffraction), TPR (temperature programmed reduction), IR (infra-red adsorption), NH 3 -TPD (temperature programmed desorption) and CO 2 -TPD (temperature programmed desorption) techniques. The results showed that the surface area of catalysts decreased with increasing metal content, and the metals as well as Cu-Ni alloy co-existed on the reduced catalyst surface. There existed interaction between metal and carrier, and moreover, metal particles affected obviously the acidity and basicity of carrier. The large amount of basic sites facilitated the activation of methanol to methoxyl species and their subsequent reaction with activated carbon dioxide. The catalysts were evaluated in a continuous tubular fixed-bed micro-gaseous reactor and the catalyst with bimetal loading of 20% (by mass) had best catalytic activities. Under the conditions of 393 K, 1.1 MPa, 5 h and gas space velocity of 510 h −1 , the selectivity and yield of DMC were higher than 86.0 % and 5.0 %, respectively.
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ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Yanchun Yang,Gang Wang,Wangen Zhao,Qingwen Tian,Lijian Huang,Daocheng Pan
Solution deposition approaches play an important role in reducing the manufacturing cost of Cu2ZnSnSe4 (CZTSe) thin film solar cells. Here, we present a novel precursor-based solution approach to fabricate highly efficient CZTSe solar cells. In this approach, low-cost elemental Cu, Zn, Sn, and Se powders were simultaneously dissolved in the solution of thioglycolic acid and ethanolamine, forming a homogeneous CZTSe precursor solution to deposit CZTSe nanocrystal thin films. Based on high-quality CZTSe absorber layer, pure selenide CZTSe solar cell with a photoelectric conversion efficiency of 8.02% has been achieved without antireflection coating.
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PubMed
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ELECTROANALYSIS
·
2014
·Vol. 26
·期 11
·2534-2540
·
IF 2.502
Shenyu Lan,Ya Xiong,Shuanghong Tian,Lianpeng Sun,Tianyao Xie,Xin Wang,Lingjun Kong
A method of capillary electrophoresis (CE) with capacitively coupled contactless conductivity detector (C 4 D) was developed to detect Cu-EDTA and its degradation intermediates simultaneously. The target compounds included oxalic acid, EDTA, Cu-EDTA, glyoxylic acid, iminodiacetic acid, formic acid and copper ion. The optimum electrophoretic conditions were determined by varying the running solution, injection voltage, injection time, and separation voltage. The anions in the reaction solution were separated and detected successfully under the conditions of 20 mmol L −1 acetate acid, electrokinetic injection of −13 kV×10 s, and separation voltage of −15 kV. Furthermore, copper ion was detected when 20 mmol L −1 acetate acid solution, electrokinetic injection of +11 kV×6 s and separation voltage of +13 kV were applied. The detection method was verified to track the degradation of Cu-EDTA with H 2 O 2 /UV.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2014
·Vol. 97
·期 9
·2897-2902
·
IF 2.428
Tianshuai Lv,Xuhui Xu,Xue Yu,Hongling Yu,Dacheng Zhou,Jianbei Qiu
A series of copper species, Tb 3+ , Mn 2+ single- and co-doped oxyfluoride glasses were synthesized by a melt-quenching method. The photoluminescence properties of the glasses containing copper species were demonstrated. Results indicate that the blue-green emission band peaking at 440 nm was observed, which was ascribed to the photoluminescence of Cu + ions rather than the emissions of Cu 2+ cations or Cu nano-particles (Cu NPs) induced by local field effect (LFE) enhancement through surface plasmon resonance (SPR). The interaction mechanisms between Cu + and Tb 3+ /Mn 2+ have been systematically investigated, and significant enhancement of Cu + emission and the energy-transfer (ET) efficiencies of Cu + →Tb 3+ and Cu + →Mn 2+ were observed in glasses doped with SnO reducing agent. Furthermore, a wide-range-tunable emission and ideal white-light fluorescence were realized in Cu + /Tb 3+ /Mn 2+ -coactivated glasses by utilization of Cu + cations as dual ET contributors from deep-UV-source to multiactivators. Our research further extends the understanding of the interactions between Cu + and Tb 3+ /Mn 2+ in amorphous materials.
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