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Preparation method of composite electrode of carbon nitride/titanium dioxide nanotube

A titanium dioxide and composite electrode technology, which is applied in chemical instruments and methods, water/sewage treatment, light water/sewage treatment, etc. problems such as low quantum efficiency, to achieve the effects of good degradation ability, reduced recombination rate, and strong oxidation performance

Active Publication Date: 2015-05-20
浙江欧托电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1. Due to its wide band gap (Eg=3.0~3.2eV), it can only absorb and utilize ultraviolet light, which accounts for about 4% of the total amount of sunlight. 43% of the visible light (400-750nm) part does not play a role
[0009] 2. It is difficult for the potential of the valence band and the conduction band to meet the potential requirements of various catalytic reactions at the same time
[0010] 3. Electron-hole recombination is easy, and the quantum efficiency is very low

Method used

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  • Preparation method of composite electrode of carbon nitride/titanium dioxide nanotube
  • Preparation method of composite electrode of carbon nitride/titanium dioxide nanotube
  • Preparation method of composite electrode of carbon nitride/titanium dioxide nanotube

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Effect test

Embodiment 1

[0042] Preparation of composite electrodes of carbon nitride / titanium dioxide nanotubes with visible light response properties:

[0043] First, ammonium fluoride (NH 4 F) and oxalic acid dihydrate (C 2 h 2 o 4 2H 2 The aqueous solution of O) is the electrolyte solution, in which the concentration of ammonium fluoride is 0.135mol / L, the concentration of oxalic acid dihydrate is 0.08mol / L, and the titanium sheet with a thickness of 0.5mm is ultrasonicated for 15min with acetone, ethanol, distilled water, nickel The slices are sanded smooth and rinsed clean. Titanium dioxide nanotube electrodes (i.e., TiO 2 -NTs electrode), the electrode distance between the anode and the cathode is 2cm, the applied voltage is 20V, stirred at an appropriate speed, and electrolyzed for 2h. Afterwards, rinsed gently with distilled water and dried naturally to obtain a titanium dioxide nanotube electrode (i.e., TiO 2 -NTs electrodes).

[0044] Then put 10g of melamine powder in a 100mL cruci...

Embodiment 2

[0047] Such as figure 2 As shown, it is a solar energy integrated wastewater degradation reaction device, including: a reactor 1 with a water inlet 4 and a water outlet 5; a composite electrode 2 of carbon nitride / titanium dioxide nanotubes and a nickel sheet electrode 3 inserted in the reactor 1 and a solar power storage device connected to the composite electrode 2 of carbon nitride / titanium dioxide nanotubes and the nickel sheet electrode 3. Reactor 1 is a cylindrical quartz reactor. The water inlet 4 is located at the bottom of the reactor 1, and the bottom of the reactor 1 refers to the bottom surface of the reactor 1 and the side wall of the reactor 1 near the bottom surface of the reactor 1, figure 2 The middle water inlet 4 is specifically on the side wall of the reactor 1 near the bottom of the reactor 1 . The water outlet 15 is positioned at the top of the reactor 1, and the top of the reactor 1 refers to the top surface of the reactor 1 and the side wall of the ...

Embodiment 3

[0050] g-C with visible light response performance was prepared according to the above-mentioned Example 1 3 N 4 / TiO 2 -NTs composite electrode, the photoelectrochemical performance test of the electrode was carried out in a three-electrode system, using the prepared g-C 3 N 4 / TiO 2 -NTs composite electrode (1cm 2 ), Pt sheet and Ag / AgCl electrode as working electrode, counter electrode and reference electrode, with 0.1M Na 2 SO 4 The aqueous solution is the electrolyte, that is, the Na in the electrolyte 2 SO 4 The concentration is 0.1mol / L. The CHI660D electrochemical workstation was used for the linear sweep voltammetry curve test. The tests were all carried out at room temperature 25°C. The xenon lamp was used as the external light source, and the ultraviolet part of λ image 3 For visible light, g-C 3 N 4 / TiO 2 -NTs composite electrode with TiO 2 -Linear sweep voltammetry curve of NTs electrode. It can be seen from the figure that the load g-C 3 N 4 After...

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Abstract

The invention discloses a preparation method of a composite electrode of a carbon nitride / titanium dioxide nanotube. The preparation method comprises the following steps: preparing the electrode of the titanium dioxide nanotube by using an anodic oxidation method; heating melamine powder to 500-700 DEG C, roasting for 1-3 hours, cooling, and then grinding to obtain carbon nitride particles; heating to 550-750 DEG C under the atmosphere of protective gas, blowing off the carbon nitride particles by adopting the protective gas so as to enable the carbon nitride particles to be loaded on the electrode of the titanium dioxide nanotube, and roasting for 20-60 minutes at the temperature of 550-750 DEG C, thus obtaining the composite electrode of the carbon nitride / titanium dioxide nanotube. The obtained composite electrode of the carbon nitride / titanium dioxide nanotube has visible-light response performance and can be applied to a wastewater treatment device; and a thin film formed on the TiO2-NTs electrode by g-C3N4 is unlikely to fall off and has good stability. The preparation method is concise in steps, easy to operate and low in cost.

Description

technical field [0001] The invention relates to the technical field of water treatment for photocatalytic degradation of organic matter, in particular to a method for preparing a composite electrode of carbon nitride / titanium dioxide nanotubes by using a physical vapor deposition method. Background technique [0002] In today's society, human beings are facing two severe problems of energy shortage and environmental pollution. On the one hand, with the continuous acceleration of energy consumption, fossil resources such as coal, oil, and natural gas are facing depletion; on the other hand, the development of industry has caused many environmental pollution problems such as industrial wastewater discharge and greenhouse gas generation. Among various environmental problems, due to the increasing demand for water and the long-term drought in some areas, the available fresh water resources are showing a continuous decreasing trend, which makes water pollution control particularl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461C02F1/467C02F1/30
CPCY02W10/37
Inventor 张轶鲁佳妮王哲烨李权峰池鹏朱远墨戴梁萍丛燕青王齐
Owner 浙江欧托电气有限公司