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Macroporous tin dioxide-titanium dioxide nanotube composite electrode and its preparation method

A nanotube composite, tin dioxide technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of affecting light absorption, low photocatalytic efficiency, cut-off effect, etc. Simple process, large specific surface area, and the effect of improving stability

Inactive Publication Date: 2013-03-06
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Tin dioxide is a semiconductor material with a band gap of 3.88eV. Although it is a good electrocatalyst, its photocatalytic efficiency is very low and it has a cut-off effect on ultraviolet light.
However, a small amount of antimony must be incorporated into SnO 2 To improve its electrocatalytic performance, but the doping of Sb will affect the TiO 2 Light absorption of NTs

Method used

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  • Macroporous tin dioxide-titanium dioxide nanotube composite electrode and its preparation method
  • Macroporous tin dioxide-titanium dioxide nanotube composite electrode and its preparation method
  • Macroporous tin dioxide-titanium dioxide nanotube composite electrode and its preparation method

Examples

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Embodiment 1

[0025] Macroporous tin dioxide-titanium dioxide nanotube composite electrode and preparation method thereof, specifically comprising the following steps:

[0026] (1) Use 0.15mm titanium sheet (99.9%) in sequence with 120 # , 320 # and 500 # Grinding with sandpaper, further polishing with metallographic sandpaper to make the surface of the substrate smooth, then ultrasonically cleaning in distilled water and acetone for 20 min, and cleaning with double distilled water. The composition of the anodizing electrolyte is 0.5wt% NaF, 1.0wt% Na 2 SO 4 In a mixed solution with 5wt% PEG400 ethylene glycol as a solvent, a titanium sheet is used as a working electrode, a platinum sheet is used as a counter electrode, the voltage across both ends is controlled to be constant at 20V, and the reaction temperature is at a constant temperature of 25°C, and the electrochemical anodic oxidation treatment is carried out for 1h. The prepared electrode was heat-treated in a tube furnace with a...

Embodiment 2

[0033] The macroporous tin dioxide-titanium dioxide nanotube composite electrode prepared in Example 1 was used to photoelectrically oxidize and degrade high-concentration and highly toxic p-nitrophenol (PNP) simulated dye wastewater.

[0034] Photocatalytic and electrocatalytic degradation are carried out in a single-cell semicircular electrochemical reaction cell, and a cup with circulating water is added to keep the temperature of the reaction system at room temperature. The prepared electrode is used as the anode, the titanium sheet is used as the counter electrode, the distance between the electrodes is 1 cm, and the electrode area is 8 cm. 2 , to contain 0.1mol L -1 Na 2 SO 4 200mg L of electrolyte -1 PNP solution is used as a simulated dye wastewater, the reaction volume is 100mL, and the degradation current density is 20mAcm -2 , the visible light source is a light energy density of 3mW / cm 2 Ultraviolet light irradiation (365nm), samples were analyzed at different...

Embodiment 3

[0036] The macroporous tin dioxide-titanium dioxide nanotube composite electrode prepared in Example 1 was used to photoelectrically oxidize and degrade highly toxic and difficult-to-biodegrade 2,4,6-trichlorophenol (TCP) simulated wastewater.

[0037] Photocatalytic and electrocatalytic degradation are carried out in a single-cell semicircular electrochemical reaction cell, and a cup with circulating water is added to keep the temperature of the reaction system at room temperature. The prepared electrode is used as the anode, the titanium sheet is used as the counter electrode, the distance between the electrodes is 1 cm, and the electrode area is 8 cm. 2 , to contain 0.1mol L -1 Na 2 SO 4 100mg L of electrolyte -1 TCP solution was used as a simulated dye wastewater, the reaction volume was 100ml, and the degradation current density was 20mA cm -2 , the light source is a light energy density of 3mW / cm 2 The UV light (365nm) was sampled at different degradation times for ...

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Abstract

The invention relates to a macroporous tin dioxide-titanium dioxide nanotube composite electrode and its preparation method. The inner layer of the electrode is a titanium matrix, and the surface layer is a composite layer of SnO2 and TiO2 nanotubes (TiO2NTs). On the surface of a titanium matrix TiO2NTs array obtained by an anodization treatment, Sb doped SnO2 is assembled by a block copolymer soft template method, thus obtaining the macroporous tin dioxide-titanium dioxide nanotube composite electrode (Mp-SnO2 / TiO2NTs) with a cribriform surface. The composite electrode prepared by the invention has large SnO2 loading capacity, the particle diameter is small, the pore size distribution is uniform, and light transmission of an SnO2 film is strong. The SnO2 film is tightly combined with a titanium matrix TiO2NTs skeleton. The electrode surface is smooth and even. The electrode not only has the characteristics of wide light absorption range, strong photocurrent response, excellent electrocatalytic property and high photoelectric synergetic catalytic efficiency, but also has stable chemical properties. In addition, with a simple preparation process and a low preparation cost, the electrode provided in the invention can be effectively used for degradation treatment of dye wastewater and organic wastewater difficult to conduct biochemical oxidation, thus having extensive economic and social benefits.

Description

technical field [0001] The invention relates to the technical fields of material chemistry, environmental chemistry and photoelectric catalysis, in particular to a macroporous tin dioxide-titanium dioxide nanotube composite electrode material with photoelectric integrated catalytic function and a preparation method thereof. Background technique [0002] As two different advanced oxidation technologies, electrocatalysis and photocatalysis are applied to the degradation treatment of organic wastewater by more and more environmental scientists. Both photocatalysis and electrocatalysis have distinct catalytic properties and different forms of energy conversion. If these two advanced oxidation technologies can be realized on the same electrode surface at the same time, it is expected to achieve a synergistic effect between the two catalytic reactions, which will help improve the photoelectrocatalytic oxidation ability and degradation efficiency of the electrode. Therefore, the f...

Claims

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Application Information

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IPC IPC(8): B01J23/14B01J23/18B01J35/10C02F1/32
Inventor 赵国华柴守宁李培强张亚男
Owner TONGJI UNIV