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Preparation and Application of TiO Photoelectrode with Controlled Exposure of {001} Crystal Planes

A titanium dioxide and photoelectrode technology, which is applied in the field of environmental pollution treatment technology and material chemistry, can solve problems such as affecting paths and rates, and achieve the effects of promoting separation, high-efficiency photoelectric catalytic performance, and high-efficiency photoelectric synergistic catalytic oxidation.

Active Publication Date: 2021-06-04
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 surface are all greatly affected by the properties of the catalyst surface, which greatly affects the path and rate of the entire reaction.

Method used

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  • Preparation and Application of TiO Photoelectrode with Controlled Exposure of {001} Crystal Planes
  • Preparation and Application of TiO Photoelectrode with Controlled Exposure of {001} Crystal Planes
  • Preparation and Application of TiO Photoelectrode with Controlled Exposure of {001} Crystal Planes

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 the preparation and application of a titanium dioxide photoelectrode with controllable exposure of the {001} crystal plane. Using a titanium plate as a titanium source and hydrofluoric acid as an end-capping agent, TiO is grown in situ on a titanium substrate by a hydrothermal method. 2 Flower-like microsphere structure, the exposure ratio of {001} crystal face is 0%~100%, the prepared {001}TiO 2 / Ti photoelectrode can be applied in photocatalytic oxidation degradation of dimethyl phthalate wastewater. Compared with the prior art, {001} TiO prepared by the present invention with controllable exposure of {001} crystal faces 2 / Ti photoelectrode has efficient photocatalytic performance (the highest photocurrent density is 0.74mA / cm 2 ), the highest removal rate of 5mg / L dimethyl phthalate can reach 94.3% within 8 hours. This electrode material and technology are suitable for the field of photocatalytic degradation of phthalate pollutants.

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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Patent Type & Authority Patents(China)
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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