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Preparation method and application of titanium dioxide heterojunction photoanode

A titanium dioxide and heterojunction technology, applied in the field of material chemistry, can solve problems such as limiting the practical application of titanium dioxide, and achieve the effects of increasing the scope of use, reducing the processing cost, and separating high efficiency

Inactive Publication Date: 2014-07-16
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Titanium dioxide is a typical broadband semiconductor (Eg=3.22eV), which can only absorb ultraviolet light with a wavelength less than 385nm in sunlight, which greatly limits the practical application of titanium dioxide.

Method used

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  • Preparation method and application of titanium dioxide heterojunction photoanode
  • Preparation method and application of titanium dioxide heterojunction photoanode
  • Preparation method and application of titanium dioxide heterojunction photoanode

Examples

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Embodiment 1

[0037] The preparation process and characterization of titanium dioxide heterojunction photoanode, the specific steps are as follows:

[0038] Fluorine-doped tin dioxide conductive glass with a size of 30×10×2.2mm was ultrasonically cleaned with acetone, ethanol and distilled water respectively to remove grease and dust on the surface. After drying, the fluorine-doped tin dioxide conductive glass was added to the hydrothermal solution and heated at 180°C for 8 hours. As the hydrothermal solution, tetrabutyl titanate hydrochloric acid solution was used, and 1 mL of tetrabutyl titanate was added to a mixture of 25 mL of concentrated hydrochloric acid and 25 mL of distilled water, and magnetically stirred until clarified. After the reaction, the electrode was rinsed with distilled water and air-dried. Then, the electrode was placed in the isopropanol solution of titanium isopropoxide, and solvothermal at 200°C for 24h. Solvothermal solution adopts titanium isopropoxide / isopropa...

Embodiment 2

[0042] A titanium dioxide heterojunction photoanode is used to simulate sunlight photoelectric catalytic degradation of bisphenol A in organic pollutant wastewater. The specific steps are as follows:

[0043] The degradation experiment of bisphenol A was carried out in a 100mL beaker. A three-electrode degradation system is adopted, and the titanium dioxide heterojunction nanoarray is used as the working electrode, and the effective photoanode area is 3cm 2 , the platinum sheet was used as the counter electrode, and saturated calomel was used as the reference electrode. Bisphenol A was prepared into simulated wastewater with a concentration of 20 mg / L by using 0.1 mol / L sodium sulfate deionized aqueous solution, and the treatment volume was 100 mL. Using simulated sunlight as the light source, the light intensity is 10mW / cm 2 . A bias voltage of +0.4 V (vs. saturated calomel electrode) was applied. Add magnetic stirring, and use circulating water cooling system to keep the...

Embodiment 3

[0047] A method for preparing a titanium dioxide heterojunction photoanode, the method comprising the following steps:

[0048] (1) ultrasonically clean the fluorine-doped tin dioxide conductive glass with acetone, ethanol, and distilled water respectively, remove surface grease and dust, and dry;

[0049] (2) adding the fluorine-doped tin dioxide conductive glass treated in step (1) into a hydrothermal solution for hydrothermal treatment, rinsing with distilled water, and drying to obtain rutile phase titanium dioxide nanorods;

[0050] (3) adding rutile-phase titanium dioxide nanorods into a solvothermal solution for solvothermal treatment, then washing with absolute ethanol, drying in the air, and annealing heat treatment to obtain a titanium dioxide heterojunction photoanode.

[0051] Wherein, the hydrothermal solution in step (2) is a mixed solution of tetrabutyl titanate, concentrated hydrochloric acid and distilled water, wherein the volume ratio of tetrabutyl titanate,...

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Abstract

The invention relates to a preparation method and an application of a titanium dioxide heterojunction photoanode. The method comprises the following steps: (1) removing grease and dust on the surface of fluorine-doped tin oxide conductive glass; (2) adding the fluorine-doped tin oxide conductive glass treated in the step (1) into a hydrothermal solution, carrying out hydrothermal treatment, and thus obtaining rutile-phase titanium dioxide nanorods; and (3) adding the rutile-phase titanium dioxide nanorods into a solvent thermal solution, carrying out solvent thermal treatment, then rinsing with anhydrous ethanol, air-drying, carrying out annealing heat treatment, and thus obtaining the titanium dioxide heterojunction photoanode. With the titanium dioxide heterojunction photoanode as a photoanode and adopting of a three-electrode system, oxidative degradation of organic wastewater is carried out by utilizing simulated sunlight. Compared with the prior art, the prepared titanium dioxide heterojunction photoanode is a nano array, and has high-distribution heterostructure, higher specific surface area, larger active crystal face exposure, and stronger sunlight photoelectric catalytic activity.

Description

technical field [0001] The invention relates to the field of material chemistry, in particular to a preparation method and application of a titanium dioxide heterojunction photoanode. Background technique [0002] Photocatalytic oxidation technology belongs to advanced oxidation technology, which is a method that can effectively treat environmental pollutant wastewater. It has the remarkable advantages of mild reaction conditions, strong oxidation ability, and no secondary pollution. In recent years, photoelectrocatalytic oxidation has been widely concerned and researched by scientists, and it is the development trend of green treatment of environmental problems in the future. A variety of catalysts have become the focus of research in this area. Among them, titanium dioxide has received high attention due to its good biocompatibility, photocatalytic activity, photochemical stability, and simple preparation process. The improvement of the performance of titanium dioxide i...

Claims

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Application Information

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IPC IPC(8): C03C17/23
Inventor 赵国华田弘毅曹同成张亚男
Owner TONGJI UNIV
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