IONICS
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2020
·Vol. 26
·期 8
·4193-4200
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IF 2.394
Zheng Li,Sun Wu-juan
A 3D metal-organic framework (Cu 4.5 (BTZE) 1.5 (OH) 4 (SO 4 )(H 2 O) 1.5 ∙4H 2 O) n (BTZE is 1,2-bis(tetrazol-5-yl) ethane anion) modified carbon paste electrode (Cu-BTZE/CPE) has been fabricated for hydrazine sensing. The Cu-BTZE framework was prepared through a facile solvo-thermal method and characterized by Fourier-transform infrared spectrometry, X-ray diffraction, and scanning electron microscopy. Meanwhile, the electrochemical performances of the modified electrode were studied by electrochemical impedance spectroscopy, chronocoulometry, cyclic voltammetry, and amperometry. Owing to the large electrochemically active surface area and enhanced electron transfer efficiency of Cu-BTZE framework, the Cu-BTZE/CPE showed enhanced electrocatalytic activity toward the oxidation of hydrazine compared with unmodified CPE. Under the optimized conditions, the amperometric current presented linear dependence on the concentration of hydrazine in the ranges of 0.02~1.2 μM and 1.2~500 μM, respectively. The detection limit was 6 nM, lower than the reported Cu-based hydrazine sensors. Furthermore, the sensor has applied for the determination of hydrazine in water samples.
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INORGANICA CHIMICA ACTA
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2020
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IF 2.304
Ping-Ping Sun,Yu-Hang Zhang,Xuehua Yu,Qi Shi,Bo Tian,Jun Gao,Fa-Nian Shi
A new 3-dimensional (3D) Mn-based metal organic framework (Mn-MOF) was created through hydrothermal method. This Mn-MOF has the molecular formula of C 10 H 10 Mn 3 N 4 O 12 and possesses orthorhombic symmetry in the Pbcn space group. As the electrode material for supercapacitors, a small amount of Cu powder is added to modify the electrode material (Mn-MOF-Cu), which has higher specific capacitance, better cycle stability and longer cycle life than the Mn-MOF. The specific capacitance of the optimized electrode material can reach 1606 F g −1 at 0.5 A g −1 , which is significantly higher than the original Mn-MOF electrode material (1106 F g −1 ). The key aspect which improves the electrochemical behavior of Mn-MOF-Cu is the introduction of Cu powder as a conductive additive, so that the advantages of the unique 3D structure of the Mn-MOF in terms of electron transport can be better displayed.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Saisai Chen,Chaohai Wang,Ming Zhang,Wuxiang Zhang,Junwen Qi,Xiuyun Sun,Lianjun Wang,Jiansheng Li
Fast and efficient tracking of micropollutants in aquatic environment by developing novel electrode materials is of great significance. Herein, a polyvinylpyrrolidone (PVP) assisted strategy is applied for synthesis of nitrogen doped Cu MOFs (N-Cu-MOF) for micropollutants electrochemical detection. The designed N-Cu-MOFs possess uniform octahedral shape with large surface area (1184 m 2 g −1 ) and an average size of roughly 450 nm, exhibiting the excellent electroanalytical capability for the detection of multipollutants. In the case of dopamine (DA) and sulfonamides (SA) as typical microcontaminants, the designed N-Cu-MOFs exhibited wide linear ranges of 0.50 nM–1.78 mM and low detection limit (LOD, 0.15 nM, S / N = 3) for the determination of DA, as well as a linear range of 0.01–58.3 μM and LOD (0.003 μM, S / N = 3) for monitoring SA. The improved performance is attributed to the heteroatom introduction and good dispersion stability of N-Cu-MOF with PVP-decorated. The good electroanalytical ability of N-Cu-MOF for detection of DA and SA can provide a guide to efficient and rapid monitor other micropollutants and construct novel electrochemical sensors.
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OPTICAL MATERIALS
·
2020
·
IF 2.779
Mengfan Liang,Qiang Lei,Shuhong Sun,Yan Zhu
In this article, the effect of the distinctiveness and arrangements on the plasmonic resonance of Cu–Ag system were studied by finite element method , and the effect of morphologies on the plasmonic properties of Cu@Ag core@shell NPs and Cu–Ag corn-cob liked NPs was investigated by experiment. For Cu@Ag core-shell structure, as the fixed thickness of Ag-shell at 10 nm, the dipole plasmon resonance gradually blue-shifts with increasing the radius of Cu core, and as the fixed radius of Cu-core at 50 nm, the feature peak shows a red-shift and broadening with increasing the thickness of Ag shell. For Cu–Ag corn-cob structure, the feature for different Ag coverage are similar to each other and most of the them follow the blue-shifted tendency with the increase the degree of Ag-coverage. Furthermore, as the regular-shaped structure increases (form trigonal to spherical), the plasmon resonance gradually blue shifts, and finally, we use two parameters to describe the different idealized Cu–Ag structure: separation, exterior contact, intersection and core@shell. The combined information from our simulation and experiment will give guidelines for choosing adequate particles when aiming at certain plasmonic properties.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Yan Zhang,Haryo Wibowo,Li Zhong,Mika Horttanainen,Zunbo Wang,Caimeng Yu,Mi Yan
High CO 2 content exists in the raw syngas produced from supercritical water gasification of food waste, CO 2 removal to improve quality of the syngas is necessary before further utilization. In this study, Cu-BTC, Mg/Cu-BTC, Cu-BTC@MWCNT, and Mg/Cu-BTC@MWCNT were synthesized and characterized as CO 2 adsorbents. The adsorption experiments were conducted to investigate the optimal adsorbent and adsorption conditions. The results indicated that Mg 2+ and multi-walled carbon nanotubes (MWCNT) doped into Cu-BTC influenced the physical properties of adsorbents. Among of all studied adsorbents, Mg/Cu-BTC@MWCNT had the maximum CO 2 adsorption capacity (3.63 mmol/g) and selectivity (14.28) at 25 °C and 100 kPa. Analysis of variance (ANOVA) exhibited that adsorption pressure had significant effects on CO 2 adsorption capacity of Mg/Cu-BTC@MWCNT. The influences of different operating parameters on CO 2 adsorption capacity and selectivity were discussed in Mg/Cu-BTC@MWCNT. The adsorption isotherms of gas components on Mg/Cu-BTC@MWCNT can be sorted as follows: CO 2 > CO > CH 4 > H 2 . In additional, the regeneration experiment with 5 times was conducted and the result showed that Mg/Cu-BTC@MWCNT has high stability.
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JOURNAL OF SOLID STATE CHEMISTRY
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2021
·
IF 3.498
Dan Li,Feigao Xu
ZIF-8@GO-X (X = 0, 2.48%, 4.07%, 7.83%, and 20.03%) composites were prepared using GO and ZIF-8. The composites were used to absorb Cu(Ⅱ) from aqueous solutions. With increasing GO content, the adsorption of the ZIF-8@GO-X composites first increased and then decreased. The Cu(Ⅱ) adsorption of ZIF-8@GO-7.83% reaches a maximum among ZIF-8@GO-X composites (X = 0, 2.48%, 4.07%, 7.83%, and 20.03%). The adsorption kinetics , adsorption isotherm , adsorption thermodynamics, and adsorption mechanism of Cu (II) by ZIF-8@GO-7.83% were studied in this paper. The results showed that the adsorption reached equilibrium at 120 min, and ZIF-8@GO-7.83% approached equilibrium relatively quickly. When the temperature was 45 °C and the Cu(Ⅱ) concentration was 40 mg/L, the maximum adsorption capacity of ZIF-8@GO-7.83% for Cu(Ⅱ) reached 482.29 mg/g. The equilibrium data and kinetics were well described by Langmuir and pseudo-first-order models, respectively. Final experiments with real factory wastewater (initial Cu(Ⅱ) concentration of 670 mg/L) revealed that 0.37 g/L ZIF-8@GO-7.83% can efficiently reduce the Cu(Ⅱ) concentration to below 2 mg/L.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Yunrui Wei,Weidong He,Pengxiao Sun,Jiangmei Yin,Xiaolong Deng,Xijin Xu
Cu/Cu 2 O/Cu 2 S nanotubes (NT) with rough-surfaces and hollow heterostructure structures have been synthesized by sulfurizing the as-prepared Cu/Cu 2 O nanowires (NWs). The Cu/Cu 2 O/Cu 2 S NT electrode exhibits excellent hydrogen evolution reaction (HER) performance with low onset overpotential of 48 mV and a Tafel slope of 107 mV dec −1 in acidic solution. Furthermore, the overpotentials are only ~86 and ~214 mV to achieve current densities of 10 and 100 mA cm −2 . The impressive catalytic performance of Cu/Cu 2 O/Cu 2 S NT toward HER can be attributed to the unique rough-surfaces, hollow structure, and the synergistic effect between multiple atoms and ions.
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JOURNAL OF POWER SOURCES
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2019
·
IF 7.467
Hao-Nan Wang,Xin Chen,Rong Chen,Xun Zhu,Qiang Liao,Ding-Ding Ye,Biao Zhang,You-Xu Yu,Wei Zhang,Jin-Wang Li
High-performance photocathode development is critically important to improve the solar energy utilization. In this study, a highly-active visible-light responsive photocathode with the ternary hybrid CuS/Cu 2 O/Cu nanowires is proposed to enhance electron transfer via the nanowired and gradient band structure and thereby the solar energy utilization. The experimental results confirm the improved photoelectrochemical activity with the ternary hybrid CuS/Cu 2 O/Cu nanowired photocathode toward oxygen reduction reaction . Besides, a photocatalytic fuel cell with the ternary hybrid CuS/Cu 2 O/Cu nanowired photocathode is also developed for direct power generation accompanying with wastewater treatment . It is demonstrated that the ternary hybrid CuS/Cu 2 O/Cu nanowired photocathode shows promising perspective. This new photocathode can be employed not only for photocatalytic fuel cells but also for other photoelectrochemical systems.
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Materials Research Express
·
2019
·Vol. 6
·期 9
·096433
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IF 1.449
Baosong Li,Shengsong Du,Tianyong Mei
Ni-Cu/TiN-ZrO2 nanocomposite coating was pulse electrodeposited by incorporation of Cu, TiN and ZrO2 simultaneously in Ni deposits from a citrate bath in the presence of additives. The surface morphology, structural and electrochemical properties of Ni-Cu/TiN-ZrO2 nanocomposite coating were evaluated. Results illustrated that the nanocomposite coating exhibits nodular-like structure with aggregated granules dispersed on its surface. The anti-corrosion performance of Ni-Cu deposits could be reinforced much by incorporation of TiN-ZrO2 nanoparticles. The surface of the coating contains Ni, Cu, Ti, Zr, O and C elements and indicates the formation of the oxide layer. The corrosion resistance of the nanocomposite coating is not only dependent on the current density and duty cycle, but also their combination. The Ni-Cu/TiN-ZrO2 nanocomposite coating electrodeposited at duty cycle of 70% and current density of 4 A dm−2 has the highest anti-corrosion performance. In comparison with duty cycle and current density, the effect of frequency on corrosion resistance is not much.
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ACS Omega
·
2019
·
IF 2.584
Yan Duan,Yijun Huang,Shengyu Chen,Weiyuan Zuo,Bingfang Shi
Development of metal-doped carbon dots (CDs) to effectively modulate their electronic properties and surface chemical reactivities is still in its early stage. In this paper, a facile solid-phase synthesis strategy was developed to synthesize Cu-doped CDs (Cu-CDs) using citric acid as the carbon source and Cu(NO3)2·3H2O as the dopant, respectively. The as-prepared Cu-CDs exhibited superior peroxidase-like activity to horseradish peroxidase and were stable under a wide range of pH and temperatures. Consequently, the Cu-CD-based chemiluminescence sensing was applied to sensitively detect glucose with a low detection limit of 0.32 μM, and the recoveries and the relative standard deviation of the serum sample are 87.2–112.2 and 8.16% (n = 6), respectively. Notably, the proposed chemiluminescence sensing was also successfully applied for label-free detection of glucose in complex biological samples, which envisioned its potential applications in clinical diagnosis and other analytical assays.
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INTERNATIONAL JOURNAL OF PHARMACEUTICS
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2018
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IF 3.862
Cuiting Zhang,Jing Li,Chenggen Qian,Xinping Luo,Kaikai Wang,Peixuan Zhao,Minjie Sun
Metal-based photothermal therapy has been widely used in the biomedicine field and includes gold nanoparticles , silver nanoparticles and copper sulfide nanoparticles. Furthermore, the coordination bonding-based metal nanocomplex is a new generation of photothermal agents for cancer therapy due to its high photothermal transduction efficiency, good biocompatibility , biodegradation and bioactivity. In this study, we designed a coordination bonding-based copper (Cu(II))-carboxylate ternary architecture, which consists of a conjugate dopamine-modified nontoxic hyaluronic acid , copper ions and citric acid. When the Cu(II) coordinated with the carboxyl groups , the splitting d orbitals energy gap of Cu(II) and the capability of electron transition were enhanced, which can increase the extinction ability in the near-infrared region for enhancing photothermal therapy. Moreover, the degradation of hyaluronic acid by hyaluronidase highly expressed in the tumor microenvironment led to the release of Cu-citric acid complexes, thus exhibiting an additional chemotherapeutic effect. The nanocomplexes possessed high-performance photothermal conversion, determined to be 21.3%. The solution could be easily heated to above 42 °C, which was sufficient to ablate the cancer cells. An obvious decrease in cell viability was observed in B16F10 cells incubated with the nanocomplexes under laser at the lower concentration of 20 μg/mL Cu(II). Upon near-infrared laser irradiation, the nanocomplexes showed high photothermal therapy and chemotherapeutic efficacy for breast cancer in vivo . This study demonstrated that the Cu(II)-carboxylate coordination nanocomplex is a promising new effective and facilely prepared thermochemotherapy agent for combination therapy against cancer.
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NANO
·
2018
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IF 1.1
Jianchao Wang,Hongsheng Luo,Xuliang Song,Xihong Zu,Jie Zhang,Yuxin Gu,Guobin Yi
In this paper, a superhydrophobic Ag–Cu composite metal film was fabricated as surface-enhanced Raman scattering substrate. Ag–Cu composite metal film was prepared from galvanic displacement on commercial copper foil. The prepared silver films were modified by PFDT to create a stable superhydrophobic SERS platform. Superhydrophobic substrates were characterized by a variety of characterization methods, including scanning electron microscopy (SEM), X-ray diffraction (XRD), UV-Vis, XPS and Raman spectra. The superhydrophobic substrate could enrich probing molecules with the volatilization of solvent. Mathematical model was presented and applied to investigate concentration factor of hydrophobic substrate. The measurements were in good agreement with the calculation results. The superhydrophobic Ag–Cu composite metal film can reduce the detection limits and provide a new way to prepare efficient SERS substrates for ultra-low concentration detection.
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