Materials
·
2019
·Vol. 12
·期 11
·1769
·
IF 2.972
Wenchao Chi,Jiawei Zou,Fanrong Ai,Yanjun Lin,Wenchao Li,Chuanliang Cao,Kang Yang,Kui Zhou
Copper is an indispensable micronutrient in human health, which has important effects on the promotion of angiogenesis and thus contributes to bone formation and antimicrobial activity. We used ion exchange and pneumatic printing methods to prepare hydroxyapatite (HA) microspheres with different copper content. The microspheres were characterized by scanning electron microscope (SEM), X-ray diffractometry (XRD) and X-Ray photoelectron spectroscopy (XPS). Considering the resistance of hydroxyapatite to biodegradation in vivo, the degradation rate of microspheres in modified simulated body fluids was studied. In addition, cell proliferation and antibacterial experiments were carried out to study the biological properties of microspheres. HA-1.5MCu microbeads treated by 1.5 mol/L CuSO4curing solution have good performance on degradation, antibacterial properties and cell survival rate on day 7. The results showed that HA-1.5MCu microbeads may be used as a good repair material for bone defects.Keywords:hydroxyapatite;microbeads;copper;biological performance
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Shenghua Chen,Wenhai Chu,Hongbin Wei,Hongying Zhao,Bin Xu,Naiyun Gao,Daqiang Yin
Haloacetamides (HAcAms), a class of highly toxic nitrogenous disinfection by-products (N-DBPs), have been widely detected in drinking water . The control of DBPs is an important measure to ensure the safety of drinking water. Due to the presence of residual chlorine and organic compounds that failed to be effectively removed, HAcAms could be formed in the finished drinking water distribution systems. In the study, Cu/Fe bimetal with different molar ratios of Cu to Fe was synthesized. This study reported that Cu/Fe bimetal reduced trichloroacetamide (TCAcAm) to dichloroacetamide (DCAcAm) and monoacetamide (MCAcAm), and the reduction ability of Fe was greatly improved due to the incorporation of Cu. The optimal HAcAm removal was achieved when the molar ratio of Cu to Fe was 2.0%, Cu/Fe bimetal could reach complete degradation of TCAcAm within 1 h. With the increase of Cu/Fe bimetal dose or the decrease of solution pH, the reduction ability of Cu/Fe bimetal for HAcAm removal also increased. The calculated integrated toxicity values from HAcAms, which was used to reflect the comprehensive control effect of Cu/Fe bimetal for HAcAms, were also reduced with the decrease of solution pH and the increase of bimetal dose. The release of Cu 2+ was not detected during the whole treatment process, Cu/Fe bimetal may be an excellent material for controlling DBPs as the end – control methods in tap water.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Sibo Chen,Xin Li,Wuyi Zhou,Shengsen Zhang,Yueping Fang
Carbon-coated Cu-TiO 2 nanocomposite (Cu-TiO 2 @C) was constructed using one-step method of thermal reduction. Their photocatalytic activity for hydrogen production from methanol aqueous solution was investigated. Under UV–vis light irradiation, the hydrogen yield of the 10 mg optimal Cu-TiO 2 @C reached 269.1 μmol h −1 , which was very close to that of Pt@TiO 2 (290.8 μmol h −1 ). The Cu-TiO 2 @C also displayed much higher photocatalytic stability in comparison with Cu-TiO 2 without coated carbon layer. The nano-Cu as photocatalytic active site improve the efficiency of photoinduced carrier separation. The carbon layer with the ability to transfer photogenerated electrons faster and to adsorb hydroxyl radicals more easily, leading to a very significant increase the reaction rate. In addition, the carbon layer can also provide a chemical protection to the Cu nanoparticles and increase the stability of the photocatalysts. The Cu-TiO 2 @C photocatalyst with the low cost, enhanced photostability and photocatalytic activity is expected to be an excellent nanocomposite t in reforming of biomass or bio-derivatives field.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2019
·
IF 3.973
Lingyan Yang,Liliang Chen,Yi-Chun Chen,Lei Kang,Jiantao Yu,Yuhang Wang,Chengjia Lu,Tsutomu Mashimo,Akira Yoshiasa,Chia-Hua Lin
Immiscible bimetallic Ag–Cu system has been synthesized by the pulsed plasma in liquid method with a graph of one pulse duration. Herein, by combining X-ray power diffraction, K-edge X-ray absorption near edge structure and high-resolution transmission electron microscopy, our results indicate that homogeneously alloyed Ag–Cu nanoparticles (Ag–Cu NAs) have the average diameter about 2.1 nm, composed by 48.5 at% Ag and 51.5 at% Cu with chemical analysis and the estimated lattice parameter was 3.873 Å. The antibacterial property of Ag–Cu NAs was detected against E. coli and S. aureus strains according to the colony formed abilities of bacteria on agar plates covered with the nanoparticles. With very short incubation period, Ag–Cu NAs completely inhibited the E. coli and S. aureus growth at an ultralow concentration. The mechanism of antibacterial property of Ag–Cu NAs was performed by the inductively coupled plasma-atomic emission spectrometry and the plane wave pseudopotential method implemented in the CASTEP package based on the density functional theory. The Ag + dissolution is correlated with antibacterial activity for Ag–Cu NAs-assisted antibacterial treatment. These findings obtained revealed that our Ag–Cu NAs could be served as a containing material of numerous bacteria-free products in order to avoid their bacterial contamination.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 16
·15492-15506
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IF 2.8
Li Junfei,Xie Yingying,Lu Guining,Ye Han,Yi Xiaoyun,Reinfelder John R.,Lin Zhang,Dang Zhi
Schwertmannite, a Fe(III)-oxyhydroxysulfate mineral formed in acidic (pH 3~4), iron- and sulfate-rich acid mine drainage (AMD) environments, tends to undergo phase transformations with changes in pH and redox condition, which may depend on the presence of various trace anions and cations. In the present study, the effects of Cu(II) on the stability of arsenate-, chromate-, and molybdate-substituted schwertmannite were investigated. The release of Fe(III) and sulfate from schwertmannite seems to be accelerated in the presence of Cu(II) at pH ~ 3, while Cu(II) retarded the dissolution of schwertmannite at pH ~ 5. XRD and SEM results showed that pure schwertmannite and chromate-substituted schwertmannite underwent transformation to goethite over a 2-month period, the presence of Cu(II) enhanced the stability of the mineral’s structure at both pH 3 and 5. However, the structures of arsenate- and molybdate-substituted schwertmannites showed no significant changes in the presence or absence of Cu(II) at both pH 3 and 5. During the phase transformation process, the amount of released oxyanions followed the sequence of chromate > molybdate > arsenate. Moreover, the release of arsenate and chromate from schwertmannite was retarded in the presence of Cu(II) at pH 5, whereas the release of molybdate was promoted. These results have important environmental implications for the stability of schwertmannite and its potential to immobilize contaminant trace elements under AMD conditions.
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Electronic Materials Letters
·
2015
·Vol. 11
·期 4
·702-706
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IF 1.98
Han Wen-Song
In this manuscript, the third-generation hyperbranched polyester was synthesized with 2, 2-dimethylol propionic acid as AB 2 monomer and pentaerythrite as core molecule by using step by step polymerization process at first. Then, the Cu-Ag particles were prepared by co-reduction of silver nitrate and copper nitrate with ascorbic acid in the aqueous solution using hyperbranched polyester as template. Finally, the Cu-Ag@Ag particles were prepared by coating silver on the surface of Cu-Ag particles by reduction of silver nitrate. The synthesized hyperbranched polyester and Cu-Ag@Ag particles were characterized by Fourier transform infrared (FT-IR) spectroscopy, UV-vis spectra, x-ray diffraction, Laser light scattering, thermogravimetric analysis (TGA) and SEM. UV-vis spectra results showed that the Cu-Ag@Ag particles had a strong absorption band at around 420 nm. Laser light scattering and SEM studies confirmed that the most frequent particle sizes of Cu-Ag@Ag particles were 1.2 um. TGA results indicated that the Cu-Ag@Ag particles had good thermal stability.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2014
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IF 2.354
Weimin Cao,Wei Li,Renhe Yin,Wei Zhou
Highly stable Cu–Sn core–shell nanoparticles with an average size of 30 nm are synthesized by displacement reaction, which is triggered by the complexation of thiourea with copper nanoparticles. A thin Sn metal shell of 2–3 nm thickness has been fabricated onto the surface of Cu nanoparticles, resulting in the Cu–Sn core–shell structure. SEM, HR-TEM, EDS, DLS, UV–vis, IR, XPS and TGA measurements have been employed to characterize the special core–shell structure, and to confirm the stability of nanoparticles toward oxidation. It has been found that the thin Sn shell prevents the Cu core from oxidation. The effect of thiourea on the Sn reduction is also discussed. Conductive ink prepared using the nanoparticles shows high stability over a long period of storage, and are hopeful to be applied for inkjet printing technology.
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CRYSTENGCOMM
·
2013
·Vol. 15
·期 48
·10495-10499
·
IF 3.879
Shufang Kou,Tingting Yao,Xiaofeng Xu,Rui Zhu,Qing Zhao,Jian Yang
Successful doping of anisotropic semiconductor nanocrystals with impurities offers an effective pathway to manipulate their physical properties and enhance the application performances. However, such doping into anisotropic nanocrystals is seldom reported because it needs simultaneous controls in the crystal growth for a specific shape and composition engineering for transition-metal doping. Here, ultrathin Cu-doped ZnSe nanorods are synthesized by a growth–doping process. The doped nanorods are characterized by XRD and TEM techniques to reveal their crystal structure. Their optical properties are described in terms of UV-Vis absorption spectra and PL spectra. The tunable emission from 480 to 520 nm evidences the successful doping of Cu into ZnSe nanorods. The effects of the reaction time, the reaction temperature and the surface ligand on the optical properties are discussed in detail. After purification, the doped nanorods with a Cu/Zn ratio of 1% give a quantum yield of 7%. This emission could be retained for weeks in air, which is important for its future applications in many fields.
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2016
·Vol. 33
·期 10
·771-778
·
IF 4.367
Gang Wang,Zhitong Jin,Meirong Zhang,Zhong-Sheng Wang
Controlling the electronic structure of a catalyst has become an important approach to tune and optimize its antipoisoning ability and catalytic efficiency for a chemical reaction. Using d -mannitol as a structure-directing agent to induce size transformation and twinned defects in copper particles, penta-twinned Cu elongated pentagonal bipyramids as supports have been synthesized, and HAuCl 4 is reduced in situ to form an AuCu alloy on the surface of Cu, generating a self-supporting AuCu@Cu core–shell structure for application as a glucose sensor in a neutral medium. The AuCu@Cu elongated pentagonal bipyramids with 0.42 at% Au show activities comparable with the Au and Pt catalyst but are more tolerant toward Cl − than Au and more tolerant toward H 3– x PO 4 x − than Cu. The mass activity of AuCu@Cu reaches 0.10 A mg −1 of Au at 0.6 V versus Ag/AgCl (3 m KCl) in a pH 8.0 buffer. The self-supporting AuCu@Cu elongated pentagonal bipyramids are promising catalysts for glucose sensing in a neutral medium. This work offers an effective way to design antitoxic and durable catalysts with ultralow content of noble metal for glucose sensing.
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Journal of Physical Chemistry C
·
2017
·
IF 4.536
Cui Lu,Jianying Wang,Steffen Czioska,Huan Dong,Zuofeng Chen
We report here the fabrication of CuO nanowires and their use as efficient electrocatalyst for the oxygen evolution reaction (OER) or as precursor for preparation of Cu3P nanowires for the hydrogen evolution reaction (HER). The surface-bound Cu(OH)2 nanowires are in situ grown on a three-dimensional copper foam (CF) by anodic treatment, which are then converted to CuO nanowires by calcination in air. The direct growth of nanowires from the underlying conductive substrate can eliminate the use of any conductive agents and binders, which ensures good electrical contact between the electrocatalyst and the conductive substrate. The hierarchically nanostructured Cu-based electrode exhibits excellent catalytic performance toward OER in 1 M KOH solution. Phosphorization of the CuO/CF electrode generates the Cu3P/CF electrode, which can act as an excellent electrocatalyst for HER in 1 M KOH. An alkaline electrolyzer is constructed using CuO and Cu3P nanowires coated copper foams as anode and cathode, which can realize overall water splitting with a current density of 102 mA/cm2 at an applied cell voltage of 2.2 V.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Tianshun Yao,Huan Zhang,Cai Qi,Jun Ma,Zihao Zhou,Quan Sun,Li Song,Yachao Jin,Mingdao Zhang
The exponential growth of electric vehicles (EVs) will lead to the large-scale retirement of lithium iron phosphate (LFP) batteries in the future. This work proposes an environmentally friendly solid-phase strategy for regenerating waste LFP cathode materials. The regeneration mechanism is also investigated through characterizations. The method involves lithium supplementation, crystal structure repair and Cu doping. Glucose is used as a reducing agent to reduce a large amount of Fe 3+ in waste LFP to Fe 2+ , while the addition of Li + is used to fill the lithium vacancy in waste LFP. Notably, Cu doping increases the vibrational density and conductivity of the regenerated material and expands the ion diffusion channel, which significantly enhances the electrochemical performance of the regenerated LFP cathode. Moreover, the specific capacity of regenerated LFP (Cu@R-LFP) at 0.05C is 160.15 mAh/g, about 97.65 % of that of new LFP (N-LFP). The capacity retention rate of Cu@R-LFP can be as high as 81.19 % even after 1,000 cycles at 1C rate. The method proposed in this study provides a simple and scalable strategy for recycling waste LFP cathode materials.
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Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 16
·5801-5809
·
IF 5.7
Shuang Wu,Wen-Guang Li,Yu-Hua Huang,Xu-Dong Wang,Dai-Bin Kuang
Bi-based halide perovskites, with much lower toxicity than Pb-based perovskites, have triggered enormous interest in optoelectronic applications. However, most Bi-based perovskites have low-dimensional crystalline structures which may have potential negative effects on carrier transport. Herein, zero-dimensional (CHDA)BiI5·3H2O is transformed into two-dimensional double perovskite (CHDA)2CuBiI8·0.5H2O through Cu+ introduction engineering, which shows increased orbital overlap and improved electronic band structure dispersion compared with the former. Notably, a 104-fold enhancement in photoresponse on–off ratio is observed for the (CHDA)2CuBiI8·0.5H2O SC photodetector. This advancement not only enhances our understanding of the intricate relationship between crystal structure and charge transport behavior in Bi-based perovskites but also paves the way for highly efficient and environmentally friendly optoelectronic device development.
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