SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Wanqing Zhang,Zhongyin Zhang,Yuanchao Li,Jun Chen,Xiaobo Li,Yadong Zhang,Yuping Zhang
A novel MIL-101(Cr)/XC-72 modified glassy carbon electrode (GCE) sensor was fabricated to determine chloramphenicol (CAP). The electrochemical sensors were constructed by using MIL-101(Cr), XC-72, MIL-101(Cr)/XC-72, and their electrochemical performances were studied with cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods. In comparison with the GCE , MIL-101(Cr)/GCE and XC-72/GCE sensors, the MIL-101(Cr)/XC-72/GCE sensor exhibited a well-defined redox peak towards CAP in phosphate buffer solution (PBS). The effects of the ratio of MIL-101(Cr) and XC-72, accumulation time, scan rate, and pH value were carefully considered. Under the optimized conditions, the sensor exhibited excellent response for CAP. The linear concentration ranges of CAP were from 1.0 × 10 −8 to 2.0 × 10 −5 M (R 2 = 0.985), with a low detection limit of 1.5 × 10 −9 M (S/N = 3). Furthermore, the MIL-101(Cr)/XC-72/GCE sensor was successfully applied to the determination of the real samples with satisfactory recoveries.
研究领域:
分析化学
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环境科学
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材料科学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Wanqing Zhang,Guangri Xu,Runqiang Liu,Jun Chen,Xiaobo Li,Yadong Zhang,Yuping Zhang
A sensitive and selective sensor was fabricated to determine melamine (Mel), based on MIL-53@XC-72 nanohybrid modified glassy carbon electrode (GCE). The MIL-53@XC-72 nanohybrid was synthesized from MIL-53 via hydrothermal method, followed by adulterating with XC-72. The prepared sensor possessed high sensitivity and selectivity due to the synergistic effect of the large surface of MIL-53, the bonding interaction between Mel and MIL-53 as well as the high conductivity of XC-72. Under the optimal conditions, the sensor exhibited rapid electrochemical response to Mel at the potential of 0.7 V in 0.1 M HCl solution. A linear concentration range of Mel was obtained from 0.04 to 10 μM with a linear correlation coefficient of 0.998 and detection limit of 0.005 μM (S/N = 3). In addition, the sensor presented excellent reproducibility, high stability and selectivity, and was successfully applied for the determination of Mel in liquid milk with a good recoveries. Hence, the MOFs@XC-72-Nafion-GCE sensor could be considered as promising applicability for the determination of other electrochemically inactive analytes.
研究领域:
分析化学
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食品科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 107
·105638-105643
·
IF 3.289
Shutao Gao,Tao Feng,Qiuhua Wu,Cheng Feng,Ningzhao Shang,Chun Wang
A novel bimetallic catalyst, AgPd nanoalloy supported on Vulcan XC-72 carbon (AgPd@C-72), has been successfully fabricated and used for catalyzing H2 generation from formaldehyde aqueous solution at room temperature for the first time. The catalyst exhibits high catalytic activity and good stability, and the hydrogen generation rates could reach up to 237.4 mL min−1 g−1, which could be attributed to the high dispersion of metal nanoparticles, the synergistic effect of bimetal AgPd, and distinct interaction between the bimetal and the support. The excellent performance of the new catalytic system renders it quite attractive as a superior competitor for efficient hydrogen production from formaldehyde at room temperature. This work might open up a new way to further develop cost-effective and highly efficient bimetallic catalysts for the generation of H2 from formaldehyde aqueous solution.
研究领域:
催化化学
·
能源材料科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Hongyuan Zhao,Yuqi Chang,Runqiang Liu,Bo Li,Fang Li,Fulong Zhang,Mingwang Shi,Lin Zhou,Xiaoguang Li
We report a scalable and controllable ultrasound-assisted strategy for the preparation of Vulcan XC-72 nanoparticles-decorated halloysite nanotubes (HNTs@VXC-72), which was applied to modify glassy carbon electrode (GCE) for the highly sensitive electrochemical determination of niclosamide (NA). For the HNTs@VXC-72 nanocomposite, VXC-72 nanoparticles with excellent electrical conductivity and good dispersing property contributed to the formation of the interconnected conductive network; HNTs possessed good adsorption performance and promoted the electrochemical redox reaction. The research results showed that the combination of VXC-72 nanoparticles and HNTs produced the effect of synergistic enhancement. The HNTs@VXC-72/GCE sensor could show a relatively low detection limit of 3.28 nM in the great linear NA concentration range of 0.01–1 µM. When used for the NA determination in food samples, the HNTs@VXC-72/GCE sensor exhibited good practical feasibility with low RSD and acceptable recoveries, which provided a promising NA determination approach to ensure food safety.
研究领域:
材料科学
·
分析化学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2016
·Vol. 74
·期 10
·2505-2514
·
IF 1.064
Xing Xiang,Qu Hongxia,Chen Peng,Chi Bin,Xie Huifang
Carbon as an adsorbent has been widely studied for wastewater treatment, but the regeneration of adsorbent has been scarcely reported. In this paper, an economical and environmental method was applied to regenerate carbon (XC-72). Results showed that both anhydrous ethanol and deionized water did not obtain optimal effect for the desorption of Acid Orange 7, Ponceau 2R and Rhodamine B, but the desorption effect was dramatically improved when anhydrous ethanol and deionized water were mixed in a certain volume ratio. In addition, the adsorption kinetics of the three dyes were investigated, which showed that the process of adsorption could be well represented by the pseudo-second-order model. For the study of competitive adsorption, this indicated that the interaction between adsorbent and adsorbate had something to do with electrostatic attraction.
✓ 已验证
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2017
·Vol. 76
·期 5
·1243-1250
·
IF 1.197
Xing Xiang,Qu Hongxia,Shao Ri,Wang Qiuyang,Xie Huifang
In this paper, alcohol (methanol, ethanol, n-propanol)-water system was used as solution for the desorption of Acid Orange 7 (AO7), Ponceau 2R and Rhodamine B (RhB) from dye-loaded carbon (XC-72). Excellent degradation efficiency was obtained (desorption efficiency reaches 77.35%, 85.60%, 96.86% for Ponceau 2R, AO7 and Rhodamine B, respectively) and it was significantly influenced by alcohol content and the length of carbon chain in alcohol (hydrophobicity). In addition, desorption kinetics was fitted by a second-order desorption model, and the desorbed quantity at equilibrium (q e ) and rate constant (k d ) were calculated, respectively.
研究领域:
环境化学
·
材料科学
·
物理化学
·
污染控制
·
吸附与解吸
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Juan Bai,Qi Xue,Yue Zhao,Jia-Xing Jiang,Jing-Hui Zeng,Shi-Bin Yin,Yu Chen
The direct formate fuel cells in alkaline medium is attracting more and more attention, because of their reasonable power density, facile power system, and low formate crossover. Herein, we successfully prepare the XC-72 carbon-supported PdRh alloy nanocrystals (PdRh/XC-72 nanocomposites) with different Pd/Rh atomic ratios by precipitation–reduction strategy. The as-prepared Pd5Rh1/XC-72 nanocomposites show the excellent electrocatalytic mass activity (4.5 A mg–1) for the formate oxidation reaction (FOR) in a KOH medium, which is 2.3-fold mass activity enhancement over commercial Pd/C anodic catalyst (1.9 A mg–1) for the FOR in a KOH medium. The obvious activity enhancement can be ascribed to the high dispersibility, the electronic effect, and the suitable OHad species. Meanwhile, the Rh atoms in the PdRh alloy also can weaken the CO accumulation during the FOR and simultaneously enhance the electrochemical self-stability of catalyst, resulting in excellent electrocatalytic durability of Pd5Rh1/XC-72 nanocomposites for the FOR. This work demonstrates that the Pd5Rh1/XC-72 nanocomposites are promising high-performance electrocatalysts for the FOR.
研究领域:
电化学
·
材料科学
·
纳米技术
·
燃料电池
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Sijie Gao,Shuozhen Hu,Guoming Luo,Shigang Sun,Xinsheng Zhang
Doping nitrogen (N) into the carbon support was widely applied to enhance the performance of Pd toward formic acid electro-oxidation (FAO). However, traditional nitrogen doping methods can only introduce a low content of nitrogen as well as a two-step complicated procedure to synthesize catalysts. In this study, a facile one-pot strategy is demonstrated to prepare N-doped carbon encapsulated palladium nanoparticles (Pd@N x C) via the pyrolysis of 2,2′-bipyridine palladium (II) complexes. A N-doped carbon layer with the thickness of about 4 nm is in-situ generated over Pd nanoparticles by only one pyrolysis procedure. Both XPS and in-situ XRD results suggest that metallic Pd is reduced from Pd 2+ by the complexed N in bipyridine during the pyrolysis at high temperature. The physical characterizations prove that the in-situ formation of N-doped carbon shell can not only effectively prevent the agglomeration or dissolution of Pd nanoparticles, but also promote the charge donation from the carbon layer to Pd, and maintain the structure of Pd atom complexed to two pyridinic-N atoms (Pd-N). This in-situ synthesis strategy can be successfully applied to carbon supports with different geometry, such as reduced graphene oxide and Vulcan XC-72. Pd@N 3 C/rGO, which contains the highest amount of N (7.39 at.%) and Pd-N (33.15%), shows the highest specific activity (5.88 mA cm −2 ) and excellent durability toward FAO.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2020
·
IF 2.726
E. Loni,M.H. Siadati,A. Shokuhfar,D. Leybo,D. Kuznetsov
Water splitting, an assuring concept for future sustainable hydrogen/oxygen production, is intensely dependent on the efficiency of catalysts to promote the oxygen evolution reaction (OER) or hydrogen evolution reaction (HER). In this regard, finding high-performance electrocatalysts for OER remains amongst the key challenges in water splitting. Here, for the first time, an aerosol-assisted spray pyrolysis method was applied to synthesize hollow spherical powder possessing nano-thick walls of sodium-cobalt pyrophosphate (Na 2 CoP 2 O 7 ) electrocatalyst for OER application. X-ray diffraction (XRD) patterns, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS) analyses were carried out for investigating the structure, composition , and morphology of the electrocatalyst powder. The electrocatalytic performances of the as-synthesized Na 2 CoP 2 O 7 powder along with its composites with Vulcan XC-72 (conductive carbon black), reduced graphene oxide (rGO) and N-doped rGO (N-rGO) were studied by the linear sweep and cyclic voltammetry (LSV and CV). The best sample synthesized was Na 2 CoP 2 O 7 /rGO (50/50 wt%), which required only 240 mV overpotential to produce a current density of 10 mA cm −2 .
研究领域:
材料科学
·
电化学
·
催化
·
可再生能源
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）