Preparation and Catalytic Performance of Expanded Graphite for Oxidation of Organic Pollutant

Lan, Rui‐Jia; Su, Weizhou; Li, Ji‐Tai

doi:10.3390/catal9030280

Cited by 39 publications

(24 citation statements)

References 56 publications

(89 reference statements)

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“…After the process, a small amount of sulfate ions still retained or C–S bonds were formed on the electrode surface. This phenomenon is in agreement with previous studies [ 41 , 42 ].…”

Section: Resultssupporting

confidence: 94%

Voltammetric Determination of Amoxicillin Using a Reduced Graphite Oxide Nanosheet Electrode

Pham

Trang

Nguyen

et al. 2021

Journal of Analytical Methods in Chemistry

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A reduced graphite oxide nanosheet electrode (RGOnS) was prepared as a sensor for amoxicillin (AMX) detection, an antibiotic commonly used in the livestock farm, by the square-wave adsorptive stripping voltammetry technique. Graphite oxide with nanosheet shape was produced from a graphite electrode by a chronoamperometry process at 5 V and then an electrochemical reduction process was carried out to form RGOnS with restored long-range conjugated networks and better conductivity. The electrodes were characterized by SEM, EDX, and FTIR spectroscopy. The RGOnS electrode prepared at an optimal reduction potential of −1 V for 120 s exhibits a larger electrochemical active surface area, and the obtained oxidation signal of AMX is approximately ten times higher than that of the pristine graphite electrode. The analytical conditions such as the pH of electrolyte and accumulation time were optimized. The calibration curve built under the optimal conditions provided a good linear relationship in the range of AMX concentration from 0.5–80 µM with the correlation coefficient of 0.9992. The limit of detection was calculated as 0.193 µM. Satisfactory results are obtained from the detection of the AMX in different samples using the prepared electrode.

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“…After the process, a small amount of sulfate ions still retained or C–S bonds were formed on the electrode surface. This phenomenon is in agreement with previous studies [ 41 , 42 ].…”

Section: Resultssupporting

confidence: 94%

Voltammetric Determination of Amoxicillin Using a Reduced Graphite Oxide Nanosheet Electrode

Pham

Trang

Nguyen

et al. 2021

Journal of Analytical Methods in Chemistry

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“…There are many studies that modify the carbon materials and construct composite materials with metal oxides such as MnO 2 , TiO 2 , and Co 3 O 4 to improve the desalting performance in CDI technology. − When employing these strategies, porous carbon materials such as AC have disadvantages related to the loss of the porous structure . In contrast, the EG has more advantages in terms of surface modification and complexation with metal oxides, prompting a number of studies on this versatile material. − EG is a promising material for the flow electrode in F-CapMix energy generation technologies.…”

Section: Resultsmentioning

confidence: 99%

Cross Effect of Surface Area and Electrical Conductivity for Carbonaceous Materials in Flow-electrode Capacitive Mixing (F-CapMix) and Flow-electrode Capacitive Deionization (FCDI): Solid-like Behavior of Flow-electrode

Hwang

Lee

Jung

et al. 2021

ACS Sustainable Chem. Eng.

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Flow-electrode capacitive mixing (F-CapMix) and flow-electrode capacitive deionization (FCDI) systems are promising for energy generation and desalination devices, respectively, because constant energy generation and desalination are possible without an intermittent step by employing continuously flowing electrodes. Activated carbon (AC) has been widely used as a flow electrode material for F-CapMix and FCDI due to its good phase stability in an aqueous medium and large surface area capable of ion adsorption. However, the relationship between the physicochemical properties of carbonaceous materials and device performances has not been systematically studied. In this study, we explore activated carbon, natural graphite, synthetic graphite, and expanded graphite with similar particle sizes to a flow electrode material to understand dominant parameters in terms of material properties for the high-performance F-CapMix system and comparison with the FCDI system. The physicochemical properties of carbonaceous materials, their rheological behaviors in an aqueous medium, and corresponding electrochemical properties are systematically studied. Among them, the flow electrode prepared with expanded graphite shows the highest power density of 0.48 W/m2 in F-CapMix due to its solidlike rheological behavior as well as high electrical conductivity and a relatively low FCDI performance of 2.7%. Our findings suggest that the internal resistance of the flow electrode, which is closely related to rheological behavior and powder electrical conductivity, is a dominant factor for the high power density in F-CapMix. In addition, the high specific surface area of carbon material and rheological behavior of the flow electrode are dominant factors for the high salt removal efficiency of the FCDI system.

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“…The yield was in the range of 77.8-89.2% and decreased with increasing temperature. The highest yield was reached at 400 • C, whereas the bulk density was relatively high, which is inappropriate for some applications (adsorption [40], catalysis [41,42], sealing materials [1], etc.) where this value must be lower.…”

Section: Resultsmentioning

confidence: 99%

Highly Porous Expanded Graphite: Thermal Shock vs. Programmable Heating

et al. 2021

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Highly porous expanded graphite was synthesized by the programmable heating technique using heating with a constant rate (20 °C/min) from room temperature to 400–700 °C. The samples obtained were analyzed by scanning electron microscopy, energy-dispersive spectroscopy, low-temperature nitrogen adsorption, X-ray photoelectron spectroscopy, Raman spectroscopy, thermogravimetry, and differential scanning calorimetry. A comparison between programmable heating and thermal shock as methods of producing expanded graphite showed efficiency of the first one at a temperature 400 °C, and the surface area reached 699 and 184 m2/g, respectively. The proposed technique made it possible to obtain a relatively higher yield of expanded graphite (78–90%) from intercalated graphite. The experiments showed the advantages of programmable heating in terms of its flexibility and the possibility to manage the textural properties, yield, disorder degree, and bulk density of expanded graphite.

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Preparation and Catalytic Performance of Expanded Graphite for Oxidation of Organic Pollutant

Cited by 39 publications

References 56 publications

Voltammetric Determination of Amoxicillin Using a Reduced Graphite Oxide Nanosheet Electrode

Voltammetric Determination of Amoxicillin Using a Reduced Graphite Oxide Nanosheet Electrode

Cross Effect of Surface Area and Electrical Conductivity for Carbonaceous Materials in Flow-electrode Capacitive Mixing (F-CapMix) and Flow-electrode Capacitive Deionization (FCDI): Solid-like Behavior of Flow-electrode

Highly Porous Expanded Graphite: Thermal Shock vs. Programmable Heating

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