JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2014
·Vol. 161
·期 9
·H453
·
IF 2.859
Jing Zhang,Xue Wang,Shibo Zhang,Wenchang Wang,Masashi Hojo,Zhidong Chen
A novel electrochemical sensing platform was designed for simultaneous determination of Ponceau 4R and Tartrazine using an ionic liquid modified expanded graphite paste electrode (IL-EGPE). The IL-EGPE was prepared by mixing ionic liquid-expanded graphite composite (IL-EG) with solid paraffin. Based on the advantageous functions of IL and EG, IL-EGPE showed excellent electrocatalytic activity toward the simultaneous oxidation of Ponceau-4R and Tartrazine. Due to the electrocatalytic activity to Ponceau-4R and Tartrazine, a sensor for Ponceau-4R and Tartrazine was constructed based on IL-EGPE. Under optimal experimental conditions, the designed sensor exhibited wide linear responses to Ponceau 4R and Tartrazine ranging from 1.0 × 10−8 to 5.0 × 10−6 mol/L and 1.0 × 10−8 to 2.0 × 10−6 mol/L, respectively. The detection limits for Ponceau 4R and Tartrazine were 1.4 × 10−9 mol/L (0.85 ng/mL) and 3.0 × 10−9 mol/L (1.6 ng/mL) at a signal-to-noise ratio of 3, respectively. This sensor showed good reproducibility, stability and reusability. The proposed sensor was successfully applied in the simultaneous determination of Ponceau-4R and Tartrazine in soft drink with satisfactory results.
研究领域:
分析化学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Xiangyu Wang,Yiming Wang,Jun Ma,Ping Ning
The wide band gap of g-C 3 N 4 and severe aggregation of Fe 0 adequately limit their applications. To address these two critical issues, novel ternary phosphorus-doped g-C 3 N 4 /Fe 0 @expanded graphite carbon layer (P-CN/Fe 0 @EGC) photocatalyst with extremely narrow band gap and significantly enhanced catalytic activity was in-situ synthesized. P-CN/Fe 0 @EGC hybrid composite exhibited excellent photodegradation performance of tetracycline (TC) removal, which is 5.18 and 1.92 times higher than that of pristine g-C 3 N 4 and Fe 0 , respectively. Enhancement in photocatalytic activity is evaluated via photoluminescence (PL), UV–vis DRS, XRD and electron spin resonance (ESR). A reasonable catalytic mechanism of P-CN/Fe 0 @EGC is proposed. The multiply synergistic mechanisms of phosphorus-doped g-C 3 N 4 (P-CN), Fe 0 and expanded graphite carbon layer (EGC), as well as the strong reducibility of Fe 0 were accounted for the expanded visible light absorption range. The even dispersion of Fe 0 on porous and worm-like structured P-CN/EGC effectively and successfully avoided the decline in photocatalytic activity caused by aggregation of Fe 0 nanoparticles . Compared with g-C 3 N 4 , the band gap of phosphorus-doped g-C 3 N 4 was narrowed from 2.79 to 2.60 eV. It is worth noting that Fe 0 plays an important role in accelerating electron transfer speed and efficiency between P-CN and EGC. The·O 2 − and h + were the dominant active substances for TC degradation . Moreover, P-CN/Fe 0 @EGC catalyst could be used repeatedly for at least 7 cycles with high TC removal efficiency. This study may pave a new way on designing high efficient ternary hybrid photocatalyst for antibiotic degradation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2013
·Vol. 160
·期 8
·H459
·
IF 2.588
Jing Zhang,Huihui Zhu,Meiling Wang,Wenchang Wang,Zhidong Chen
A novel and sensitive electrochemical method was proposed for the determination of Sunset yellow (SY) using an expanded graphite paste electrode (EGPE). The EGPE was prepared by mixing expanded graphite (EG) with solid paraffin. EG was characterized with scanning electron microscopy. Compared with flake graphite paste and carbon paste electrode, the EGPE showed a higher electrocatalytic activity toward the oxidation of SY. The EGPE exhibited wide linear response of 5.0 × 10−8−2.0 × 10−6 mol/L with a detection limit down to 5.0 nmol/L (S/N = 3) and good accuracy, precision, reproducibility. The proposed method was successfully applied in the determination of SY in jelly and fruit juice.
研究领域:
分析化学
·
食品科学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Lina Wang,Yun Zhao,Yunzhen Chang,Sheng Zhu,Xingguo Qi
The construction of nano-micro scale hybrid structures by carbon materials is an effective strategy to address the issues of metal chalcogenides when used as anodes of sodium-ion batteries. Herein, we develop a carbon nanotube (CNT)-interweaved Fe 7 Se 8 /expanded graphite (EG) composite by means of a facile one-step gas-phase pyrolysis route with ferrocene , selenium and EG as the starting materials. The ex-situ monitoring of the pyrolysis process indicates that the selenium as a promoter facilitates the formation of CNTs and the carbon coated Fe 7 Se 8 nanosheet/nanorod mixture. A competing reaction between CNT growth and the evolution of Fe 7 Se 8 nanostructures occurs, which could be dominated by the concentration of selenium vapor. By optimizing the feeding ratio and the pyrolysis condition, the nanocomponents are homogeneously deposited on the surface of the EG matrix to realize a well-developed nano-micro hybrid configuration. The constructed three-dimensional conductive network, rich mesopores and high specific surface area (107.1 m 2 g −1 ) contribute to substantially enhanced sodium-storage performance in ester electrolyte. Remarkably, the optimized composite electrode exhibits high reversible capacity retention of 97.5 % after 1000 cycles at 1.0 A g −1 and improved rate performance of 325 mAh g −1 at 2.0 A g −1 . This study provides new avenues to develop high-performance metal chalcogenide electrodes for electrochemical energy storage .
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2014
·
IF 3.259
Jing Zhang,Meiling Wang,Chao Shentu,Wenchang Wang,Zhidong Chen
A sensitive and convenient electrochemical method was developed for the simultaneous determination of the isomers of Ponceau 4R and Amaranth by an expanded graphite paste electrode (EGPE). The EGPE was prepared by mixing EG with solid paraffin. Compared with flake graphite paste and carbon paste electrodes, the EGPE showed higher electrocatalytic activity towards the oxidization of Ponceau 4R and Amaranth. Under optimal experimental conditions, the EGPE exhibited wide linear responses to Ponceau 4R and Amaranth ranging from 6 × 10 −8 to 4 × 10 −6 mol/L and 8 × 10 −8 to 4 × 10 −6 mol/L, respectively, and the detection limits for Ponceau 4R and Amaranth were 2 and 36 nmol/L, respectively, at a signal-to-noise ratio of 3. The EGPE showed good reproducibility, stability and reusability. The proposed method was successfully applied in the detection of Ponceau 4R and Amaranth in grape juice samples.
研究领域:
分析化学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materiomics
·
2021
·
IF 6.425
Bin Liang,Kangwei Liu,Peng Liu,Long Qian,Guangyao Zhao,Weisheng Pan,Chaojie Chen
How to improve the efficiency of liquid-phase shear exfoliation (LPSE) for mass production of large-size graphene nanosheets still remains an ongoing challenge. In this work, we have developed a LPSE method using a rotor-stator mixer. It is quite simple and efficient by exfoliation of expanded graphite (EG) in N-methyl-2-pyrrolidone (NMP) with the assistance of organic salts including sodium citrate, potassium citrate and sodium tartrate. The LPSE of EG in NMP can provide improved yields, up to 6 times as high as values from exfoliation of natural flake graphite (NFG). The additive of organic salts in NMP can make a further improvement in graphene yields, 1.5 times higher than that obtained only in NMP. Remarkably, the yields of the as-exfoliated graphene are as high as 10% under optimal conditions, and up to 50% after multiple-cycle exfoliation. Organic salts in LPSE act as analogue grinding aids enhancing the applied shear forces and thus contributing to the improved efficiency of LPSE, but they do not intercalate into the interplanar spaces of graphite. This facile LPSE method should have excellent potential in the large scale production of graphene nanosheets for numerous applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Kai-Yang Zhang,Han-Hao Liu,Meng-Yuan Su,Jia-Lin Yang,Xiao-Tong Wang,Edison Huixiang Ang,Zhen-Yi Gu,Shuo-Hang Zheng,Yong-Li Heng,Hao-Jie Liang,Yinglin Wang,Shuying Li,Xing-Long Wu
Expanded graphite (EG) stands out as a promising material for the negative electrode in potassium-ion batteries. However, its full potential is hindered by the limited diffusion pathway and storage sites for potassium ions, restricting the improvement of its electrochemical performance. To overcome this challenge, defect engineering emerges as a highly effective strategy to enhance the adsorption and reaction kinetics of potassium ions on electrode materials. This study delves into the specific effectiveness of defects in facilitating potassium storage, exploring the impact of defect-rich structures on dynamic processes. Employing ball milling, we introduce surface defects in EG, uncovering unique effects on its electrochemical behavior. These defects exhibit a remarkable ability to adsorb a significant quantity of potassium ions, facilitating the subsequent intercalation of potassium ions into the graphite structure. Consequently, this process leads to a higher potassium voltage. Furthermore, the generation of a diluted stage compound is more pronounced under high voltage conditions, promoting the progression of multiple stage reactions. Consequently, the EG sample post-ball milling demonstrates a notable capacity of 286.2 mAh g -1 at a current density of 25 mA g −1 , showcasing an outstanding rate capability that surpasses that of pristine EG. This research not only highlights the efficacy of defect engineering in carbon materials but also provides unique insights into the specific manifestations of defects on dynamic processes, contributing to the advancement of potassium-ion battery technology.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
·
2013
·
IF 1.24
Meiling Wang,Jing Zhang,Nini Ding,Zhidong Chen
In this work, a sensitive and simple method was first developed for electrochemical determination of Ponceau 4R (E 124) based on an expanded graphite paste electrode (EGPE) by the square-wave stripping voltammetry (SWSV) method. The EGPE displayed good analytical performance for the measurement of Ponceau 4R. Under the optimum experimental conditions, Ponceau 4R could be linearly detected in the wide concentration range of 1.0 × 10−8 to 3.0 × 10−6 M, with a detection limit down to around 6.3 × 10−9 M at signal to noise ratio of 3:1. The developed method was successfully applied to the determination of Ponceau 4R in food samples with satisfying results and the results agreed with those from the high performance liquid chromatography (HPLC).
研究领域:
分析化学
·
食品安全
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Jing Zhang,Xin-he Song,Sa Ma,Xue Wang,Wen-chang Wang,Zhi-dong Chen
A sensitive and selective method was developed for the electrochemical determination of dopamine by using a sodium dodecyl benzene sulfonate modified expanded graphite paste electrode (SDBS-EGPE). The SDBS-EGPE was prepared by mixing expanded graphite (EG) self-assembled with sodium dodecyl benzene sulfonate (SDBS) with solid paraffin. SDBS formed a monolayer on EG surface with a high density of negatively charged end. Compared with EGPE, SDBS-EGPE showed improved electrochemical response of dopamine (DA) due to the enhanced accumulation of protonated DA via electrostatic interactions between positively charged DA and negatively charged SDBS. Under optimal experimental conditions, the designed electrode exhibited wide linear responses to DA ranging from 0.5 μmol/L and 500 μmol/L with a low detection limit of 0.027 μmol/L at a signal-to-noise ratio of 3. The SDBS-EGPE showed a good reproducibility, stability and reusability. The SDBS-EGPE showed a high selectivity for DA in the presence of ascorbic acid (UA) and uric acid (AA) due to the electrostatic repulsions between negatively charged UA , AA and SDBS. The proposed electrode was successfully applied in the determination of DA in the commercial dopamine hydrochloride injection sample.
研究领域:
分析化学
·
生物医学工程
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Borong Yu,Yue Mao,Jiangli Li,Jiaosuo Wang,Binbin Zhou,Pan Li,Yuanyuan Ma,Zhangang Han
Surface enhanced Raman spectroscopy (SERS) is a promising technique for trace determination. More and more attention is focused on hybrid SERS substrates, which coupled with noble metal nanoparticles and carbon-based materials. Herein, expanded graphite (EG) is used to prepare EG-covered support by ultrasonic washing and filtration. Such support is flexible and can be cut into any shape. And the contact angle ( θe ) for Au nanorods (Au NRs) sol on the EG-covered support was 108.2° and the hydrophobic surface is helpful for Au NRs to construct ‘hot spots’ during evaporation. The limits of detection (LOD) for crystal violet (CV), thiram, malachite green (MG) and methylene blue (MB) were as low as 1 ppb, 50 ppb, 1 ppb and 1 ppb, respectively. Moreover, a fast and convenient ‘paste-sampling’ method could be employed for trace contaminants on real samples, because EG-based Au NRs substrate is of flexibility and porosity. Thus, CV residue on shrimp could be determined lower than 1 ppb and thiram residue on grapes could be identified lower than 50 ppb. In addition to high sensitivity, the stability of EG-based Au NRs substrate is also very good. Even after acid/alkali pretreatment (pH = 4∼10) or 30 min of thermal treatment (T = 20∼100 °C), the enhancement of the substrate remained stable. What’s more, the substrate could be stored as long as 30 days. The highly stable, sensitive, cost-effective and easy-to-produce EG-based Au NRs substrates exhibit a great potential to promote application of SERS for routine analysis.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2021
·
IF 7.267
Tao Hu,Shuya Chang,Hongzheng Wu,Li Li,Wenhui Yuan
Improving the light-to-thermal conversion properties of phase change materials (PCMs) is conducive to the development of their applications in solar thermal energy storage systems. In this work, a porous structure of expanded graphite (EG) modified Ni-MOF was synthesized by hydrothermal synthesis , and scattered in CH 3 COONa‧3H 2 O (SAT) by a physical blending and impregnation method to obtain a novel composite phase change material with reinforce light-to-thermal conversion. The resulting composite PCM showed that the latent heat of composite PCM was 166.6J/g, the supercooling temperature was reduced to 2.5 °C. The porous network structure formed by the close combination of EG and MOF effectively enhanced the heat transfer rate of composite PCM. The thermal conductivity of composite PCM was about 3.21 times that of pure SAT . Furthermore, the composite PCM showed good thermal cycling performance and excellent light-to-thermal conversion properties, which could be suggested as a promising candidate for solar thermal storage systems.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Zhi Song,Yu-Long Ma,Cong-Er Li
Tetracycline (TC), a major pollutant in water, has an adverse effect on ecosystem and human health. Thus, it is urgent to remove but still remains a challenging. In this work, a new adsorbent of MnO 2 decorated on sodium hypochlorite treated expanded graphite (MnO 2 /TEG) was developed by an in situ hydrothermal method, which exhibited a highly removal rate of 99.2% to pharmaceutical wastewater treated by flocculation. The structure and morphology of the adsorbent was studied by detailed physical characterization. Meanwhile, the main influencing factors on the adsorption behavior such as pH value, concentration, temperature of the solution, adsorption time, metal oxide species and MnO 2 loading amount were also investigated in detail. It was found that the electrostatic adsorption between Mn 4+ in MnO 2 /TEG and dimethylamino groups in TC molecules played an important role during the adsorption process. These excellent properties proved that the novel composite could be applied to remove TC residues in pharmaceutical wastewater.
研究领域:
环境科学
·
水处理技术
·
材料科学
·
环境污染与控制
·
药物残留去除
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）