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Tin-molybdenum codoped titanium dioxide nanotube array electrode and preparation method

A technology of nanotube array and titanium dioxide, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of increasing the preparation process, achieve the expansion of application range, convenient preparation, and realization of inorganic Degradation effect

Active Publication Date: 2017-07-04
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current research mostly adopts the method of two-step deposition for TiO 2 The doping and modification of nanotubes increases the preparation process, and at present the co-doping of various elements, especially for the co-doping of metals Sn and Mo, has not been reported.

Method used

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  • Tin-molybdenum codoped titanium dioxide nanotube array electrode and preparation method
  • Tin-molybdenum codoped titanium dioxide nanotube array electrode and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] 1. Polish the Ti sheet with sandpaper until the surface is smooth, then immerse it in acetone, isopropanol, and absolute ethanol solution for ultrasonic treatment for 15 minutes to remove oxides and oil on the surface of the Ti sheet, then rinse it with deionized water, and dry it with nitrogen gas for later use ;

[0027] 2. The mass fraction is 3.5wt% NH 4 F was dissolved in deionized water with a volume ratio of 10:8:1, 65% concentrated nitric acid, and analytically pure hydrofluoric acid mixed solution to prepare an etching solution, and the Ti sheet prepared in 1 was placed in the etching solution Etch for 30s, then rinse with deionized water, and blow dry with nitrogen for later use;

[0028] 3. Na 2 SnO 3 ·3H 2 O, Na 2 MoO 4 ·H 2 O and 0.5 wt% NH 4 F was dissolved in an ethylene glycol-water mixed solution with a volume ratio of 24:1, stirred and mixed evenly to prepare an electrolyte solution, the molar concentration of Sn in the solution was 0.01mol / L, ...

Embodiment 2

[0033] This embodiment differs from Example 1 in that the molar concentration of Sn in the prepared electrolyte solution is 0.05 mol / L, and the molar concentration of Mo is 0.05 mol / L.

[0034] Scanning electron microscope (SEM) test: for the prepared Sn-Mo-TiO 2 - The surface morphology of NTs / Ti electrode was characterized and tested, the results are as follows figure 1 shown.

[0035] Photoelectric performance test: Sn-Mo-TiO 2 -NTs / Ti electrode as working electrode, platinum sheet as counter electrode, Hg / Hg 2 SO 4 The electrode is the reference electrode, with 0.05mol / L Na 2 SO 4 As an electrolyte solution, a 300W xenon lamp equipped with an AM 1.5 simulated sunlight reflector was used as a light source, and the photoresponse ability of the electrode was measured by chronoamperometry under an external bias voltage of 0.5V. The maximum photoresponse current measured under light conditions is 780μA, such as figure 2 Curve (2) shows.

[0036] UV-Vis Diffuse Reflecta...

Embodiment 3

[0038] The difference between this embodiment and Example 1 is that the molar concentration of Sn in the prepared electrolyte solution is 0.05 mol / L, and the molar concentration of Mo is 0.1 mol / L.

[0039] Photoelectric performance test: Sn-Mo-TiO 2 -NTs / Ti electrode as working electrode, platinum sheet as counter electrode, Hg / Hg 2 SO 4 The electrode is the reference electrode, with 0.05mol / L Na 2 SO 4 As an electrolyte solution, a 300W xenon lamp equipped with an AM 1.5 simulated sunlight reflector was used as a light source, and the photoresponse ability of the electrode was measured by chronoamperometry under an external bias voltage of 0.5V. The maximum photoresponse current measured under light conditions is 514μA, such as figure 2 Curve (3) shows.

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Abstract

The invention belongs to the field of photoelectrocatalysis, and relates to a tin-molybdenum codoped titanium dioxide nanotube array electrode and a preparation method. Sodium stannate (Na2SnO3.3H2O), sodium molybdate (Na2MoO4.H2O) and ammonium fluoride (NH4F) are dissolved in an ethanediol-water mixed solution, a titanium sheet is used as an anode, a platinum sheet is used as a cathode, and a two-electrode system is adopted for preparing a Sn and Mo containing titanium dioxide nanotube array on the surface of the titanium sheet. After cleaning and drying, the Sn and Mo containing titanium dioxide nanotube array is put into a muffle furnace to be subjected to high-temperature calcination to form the Sn and Mo codoped titanium dioxide nanotube array electrode (Sn-Mo-TiO2-NTs / Ti). By means of the electrode obtained after doping, the responsiveness of TiO2 to visible light is improved, and the photoelectrocatalysis oxidizing ability under the visible light is achieved.

Description

technical field [0001] The invention belongs to the field of photoelectric catalysis, in particular to a one-step method for preparing tin-molybdenum (Sn-Mo) co-doped titanium dioxide nanotubes (TiO 2 -NTs) array electrode method, which can be used for the photoelectrocatalytic degradation of phenol in environmental water. Background technique [0002] Photocatalysis is an electrochemically assisted photocatalysis method developed at the end of the 20th century. The research on photocatalysis originated from semiconductor photocatalysis, among which TiO 2 The research and application of the most in-depth and extensive. TiO 2 It has the advantages of non-toxicity, high catalytic activity, strong oxidation ability, good stability, mild reaction conditions, no secondary pollution, and easy-to-obtain preparation materials. TiO 2 The band gap is 3.2eV, and it has a catalytic effect under ultraviolet light. When treating wastewater under ultraviolet light irradiation, TiO 2 A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26C23F1/26B82Y30/00B82Y40/00
Inventor 孙治荣麻晓越王雪云
Owner BEIJING UNIV OF TECH
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