Ferric oxide, graphene oxide and N-F codoped visible light response electrode as well as preparation method and application thereof

A technology of responsive electrodes and graphene, applied in the field of photocatalytic materials, can solve the problems of microorganisms that are difficult to degrade, difficult to handle, and highly toxic

Inactive Publication Date: 2015-06-24
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, wastewater containing heavy metals is highly toxic, difficult for microorganisms to degrade, and even more difficult to treat

Method used

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  • Ferric oxide, graphene oxide and N-F codoped visible light response electrode as well as preparation method and application thereof
  • Ferric oxide, graphene oxide and N-F codoped visible light response electrode as well as preparation method and application thereof
  • Ferric oxide, graphene oxide and N-F codoped visible light response electrode as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Will Fe 2 o 3 -GO / NF-TiO 2 The electrode is placed in Na with a concentration of 0.1mol / L 2 SO 4 solution, add the sacrificial agent Na 2 SO 3 (0.1mol / L), under the electrochemical workstation 3 electrode system, with Fe 2 o 3 -GO / NF-TiO 2 - The NTs electrode is the working electrode, the platinum sheet is the counter electrode, the silver electrode is the reference electrode, the xenon lamp is the light source, and the ultraviolet light below 420nm is filtered out with a filter.

[0075] From Figure 1-a , Figure 1-b As can be seen in the TiO 2 -NTs in NH 4 Under the F modification, the surface morphology changed greatly after high-temperature calcination, from tubular to irregular, and at the same time, the transport mode of photogenerated electrons and the performance of the electrode changed greatly. figure 2 Fe under voltage for different electrochemical workstations 2 o 3 -GO / NF-TiO 2 The time-current curve of the electrode, by figure 2 It can be...

Embodiment 2

[0077] Under the 3-electrode system of the electrochemical workstation, the electrolyte is Na with a concentration of 0.5mol / L 2 SO 4 solution, respectively with Fe 2 o 3 -GO / NF-TiO 2 The electrode is the working electrode, the platinum electrode is the counter electrode, and the silver electrode is the reference electrode. The AC impedance of the composite electrode was measured in the dark and under visible light irradiation respectively.

[0078] Figure 3-a It is a comparison chart of AC impedance of different electrodes under visible light irradiation. Nyquist diagrams of various electrodes, Fe 2 o 3 -GO / NF-TiO 2 The radius of the impedance ring of the composite electrode is the smallest, indicating that the interfacial charge transfer resistance of this electrode is small.

[0079] Figure 3-b for Fe 2 o 3 -GO / NF-TiO 2 Comparison of AC impedance of electrodes under dark and light conditions. It can be seen from the figure that the impedance conversion radiu...

Embodiment 3

[0081] Study on the effect of different deposition times on the preparation of Fe 2 o 3 -GO / NF-TiO 2 Effect of composite electrode. N, F-TiO 2 Soaked in Fe(NO 3 ) 3 solution, air-dried. With platinum as the cathode and graphite as the anode, in Na with a concentration of 0.1mol / L and a water temperature of 2 SO 4 In the electrolyte, apply a constant voltage of 5V for 15min, and turn off the power. Using the solution prepared above as the electrolyte, the soaked NF-TiO 2 As the cathode, the graphite electrode as the anode was electrodeposited at a constant voltage of 5V for 20min. Use this electrode as the anode and the graphite as the cathode, in 1mol / L KOH electrolyte at room temperature, apply a constant voltage of 5V for anodic oxidation for 2min, and turn off the power. Repeat the above steps 4 and 5 to finally obtain Fe with different deposition times 2 o 3 -GO / NF-TiO 2 composite electrode.

[0082] Figure 4 Fe for different deposition times 2 o 3 -GO / NF...

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Abstract

The invention discloses a ferric oxide, grapheme oxide and N-F codoped visible light response electrode as well as a preparation and application thereof. The method comprises the following steps: (1) mixing a TiO2-NTs electrode with NH4F under an air atmosphere, and calcining the mixture to obtain an N, F-TiO2 electrode; (2) immersing the N, F-TiO2 electrode in Fe(NO3)3, using a graphite electrode as an anode, using a platinum sheet as a cathode, using Na2SO4 as an electrolyte, and dissolving graphene to get a grapheme electrolyte; (3) drying the immersed electrode serving as a cathode, using the graphite electrode as a anode, and electrically depositing the electrodes in grapheme electrolyte; and (4) using the electrode which is processed in the step (3) as an anode, using graphite as a cathode, and using KOH as an electrolyte to perform electric deposition, cleaning and drying the electrically deposited electrode. In the electrode provided by the invention, after ferric oxide and grapheme oxide are codoped, the photo electron and cavity separation effect is good, the photo-electric current is high, the effect for treating chromium-containing wastewater through photo-electro cooperation is good, no secondary pollution exists, and the treated wastewater is reusable.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, in particular to a visible light responsive electrode co-doped with iron oxide and graphene oxide, a preparation method and application thereof. Background technique [0002] While human beings are facing environmental pollution, they are also facing the problem of energy shortage. On the one hand, environmental pollution, especially water pollution, is increasing day by day, seriously threatening human health and life. Among them, wastewater containing heavy metals is highly toxic, difficult to degrade by microorganisms, and even more difficult to treat. On the other hand, with the development of photocatalytic technology, the use of photocatalysts to split water to produce hydrogen is expected to alleviate the energy crisis. [0003] Nanotube titanium dioxide film is a new type of titanium dioxide nanomaterial developed in recent years, which has a good effect in reducing hea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/30C02F1/461C02F1/62C02F101/22
CPCY02W10/37
Inventor 王齐朱纳鑫石晓东胡静涛王春春傅蕾凌刘妍秋张轶
Owner ZHEJIANG GONGSHANG UNIVERSITY
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