Preparation and applications of {001} crystal face controllable exposed titanium dioxide photoelectrode

A titanium dioxide and photoelectrode technology, applied in the field of environmental pollution treatment technology and material chemistry, can solve problems such as affecting the path and speed, and achieve the effect of improving poor conductivity

Active Publication Date: 2018-11-30
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the characteristics of the catalyst surface, the accumulation of holes, and the adsorption state of the catalyst on the surf

Method used

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  • Preparation and applications of {001} crystal face controllable exposed titanium dioxide photoelectrode
  • Preparation and applications of {001} crystal face controllable exposed titanium dioxide photoelectrode
  • Preparation and applications of {001} crystal face controllable exposed titanium dioxide photoelectrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A {001} TiO with Controlled Exposure of {001} Crystal Planes 2 The preparation method of / Ti photoelectrode specifically comprises the following steps:

[0025] (1) The titanium plate is chemically polished in a polishing solution mixed with nitric acid, hydrofluoric acid and water. The ratio of the polishing solution is nitric acid: hydrofluoric acid: water volume ratio 3:1:6.

[0026] (2) Mix the hydrofluoric acid of 27uL (≥38wt%) with the deionized water of 30mL, stir evenly, move into the autoclave of 100mL, put into step (1) through the titanium plate of chemical polishing process, seal, Hydrothermal reaction was carried out in an oven at 180°C for 4h.

[0027] (3) After the reaction in step (2) is completed, cool the reactor at room temperature, take it out, rinse it with deionized water, and let it dry naturally. Under air atmosphere, the heating rate was 3°C / min, the calcination temperature was 450°C, and the calcination time was 3h. That is, get 4h-{001}TiO ...

Embodiment 2

[0030] A {001} TiO with Controlled Exposure of {001} Crystal Planes 2 The preparation method of / Ti photoelectrode specifically comprises the following steps:

[0031] (1) The titanium plate is chemically polished in a polishing solution mixed with nitric acid, hydrofluoric acid and water. The ratio of the polishing solution is nitric acid: hydrofluoric acid: water volume ratio 3:1:6.

[0032] (2) Mix the hydrofluoric acid of 27uL (≥38wt%) with the deionized water of 30mL, stir evenly, move into the autoclave of 100mL, put into step (1) through the titanium plate of chemical polishing process, seal, Hydrothermal reaction was carried out in an oven at 180°C for 2h.

[0033] (3) After the reaction in step (2) is completed, cool the reactor at room temperature, take it out, rinse it with deionized water, and let it dry naturally. Under air atmosphere, the heating rate was 3°C / min, the calcination temperature was 450°C, and the calcination time was 3h. That is to get 2h-{001}TiO...

Embodiment 3

[0036] Using 2h-{001}TiO prepared in Example 2 2 / Ti photoelectrode ({001} crystal surface exposure ratio 30%) photoelectrically degrades DMP simulated wastewater efficiently, and the specific steps include the following:

[0037] The photoelectric degradation DMP experiment was carried out in the electrochemical reaction cell, and a cup with circulating water was added to keep the constant temperature of the reaction system at 25°C. Using a three-electrode degradation system, {001}TiO 2 The / Ti electrode is the working electrode, the platinum sheet is the counter electrode, the distance between the working electrode and the counter electrode is 1cm, and the effective photoelectrode area is 3×5cm 2 . Use 0.1mol·L -1 Dimethyl phthalate was prepared into simulated wastewater with a concentration of 5mg / L in deionized aqueous solution of sodium sulfate, and the treatment volume was 100mL. Ultraviolet xenon lamp (main wavelength is 365nm) as the light source, the light intensit...

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Abstract

The invention relates to preparation and applications of a {001} crystal face controllable exposed titanium dioxide photoelectrode. According to the preparation, a titanium plate is taken as a titanium source, hydrofluoric acid is taken as an end-capping reagent, hydro-thermal method is adopted for in-suit growth of TiO2 flower-shaped microsphere structures on the titanium base plate, the {001} crystal face exposure ratio ranges from 0 to 100%, the obtained {001} TiO2/Ti photoelectrode can be applied in dimethyl phthalate waste water photoelectric catalytic oxidation degradation. Compared withthe prior art, the advantages are that: the {001} crystal face controllable exposed {001} TiO2/Ti photoelectrode is high in photoelectrocatalysis performance (the highest photocurrent density is 0.74mA/cm<2>), the removing rate on 5mg/L dimethyl phthalate in 8h is as high as 94.3%. The electrode material and the technology are suitable to be used in the field of phthalate pollutant photoelectrocatalysis degradation.

Description

technical field [0001] The invention relates to the fields of environmental pollution treatment technology and material chemistry, in particular to {001} TiO with controllable exposure of {001} crystal planes 2 / Ti photoelectrode for efficient catalytic oxidation removal of phthalates. Background technique [0002] Phthalates esters (PAEs) are commonly used artificially synthesized typical endocrine disruptors that pose serious hazards to human health. They are used as a modified additive for plastics to increase the plasticity of plastics. And strength, widely used in industry as a plasticizer for synthetic rubber, paint solvents, etc. In addition, PAEs have the characteristics of being insoluble in water, low volatility, and low temperature resistance. They are used in the production of pesticides, cosmetics, paints, lubricants, etc. During the use of plastic products by humans, they enter the human body through breathing, eating, and skin contact. It has an important im...

Claims

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Application Information

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IPC IPC(8): C02F1/467C02F1/72C02F1/32C02F101/34
CPCC02F1/32C02F1/46109C02F1/4672C02F1/725C02F2001/46133C02F2001/46142C02F2101/34
Inventor 张亚男韩胜男黎雷赵国华
Owner TONGJI UNIV
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