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Method for preparing beta-Bi2O3/TiO2-NTs composite photocatalyst with high stability visible light catalytic activity

A catalytic activity and visible light technology, applied in the field of material chemistry, can solve problems such as hindering the application of visible light catalysts, weak hole oxidation ability, and decreased photocatalytic activity, so as to achieve enhanced photocatalytic activity, high space utilization, and reduced contact probability. Effect

Active Publication Date: 2013-03-13
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, β-Bi 2 o 3 Three major problems hinder its further application as a visible light catalyst
First, β-Bi 2 o 3 It belongs to the metastable state, and it is easy to transform to α-type during the photocatalytic process, and reacts with carbon dioxide to produce carbonate, resulting in a decrease in photocatalytic activity; secondly, low quantum efficiency leads to poor photocatalytic activity; finally, β-Bi 2 o 3 The valence band position is relatively negative, and the hole oxidation ability is weak, especially for the degradation of aromatic organic pollutants.

Method used

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  • Method for preparing beta-Bi2O3/TiO2-NTs composite photocatalyst with high stability visible light catalytic activity
  • Method for preparing beta-Bi2O3/TiO2-NTs composite photocatalyst with high stability visible light catalytic activity
  • Method for preparing beta-Bi2O3/TiO2-NTs composite photocatalyst with high stability visible light catalytic activity

Examples

Experimental program
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Effect test

Embodiment 1

[0034] β-Bi 2 o 3 / Ti photocatalyst preparation. Described method specifically comprises the following steps:

[0035] (1) Set the thickness to 0.08mm and the size to 3cm 2 The surface of the pure titanium sheet is mechanically polished and cleaned;

[0036] (2) Add 0.1mol / L Bi(NO 3 ) 3 ·5H 2 O, 3 mol / L HCl, 0.04 mol / L EDTA are prepared as electroplating solution;

[0037] (3) The Ti prepared in step (1) was used as the working electrode, the platinum sheet was used as the auxiliary electrode, and the saturated calomel electrode (SCE) was used as the reference electrode. At room temperature, Bi nanoparticles were deposited on the Ti sheet by pulse electrodeposition. Above, the pulse deposition current is cathode pulse (-80mA 10ms), anode pulse (80mA 1ms), rest time (0A 1s), and the number of pulse cycles is 100 times; then placed in a tube furnace for calcination in an oxygen atmosphere, the calcination time is 2h , to prepare β-Bi 2 o 3 / Ti photocatalyst products; ...

Embodiment 2

[0040] A preparation method of β-Bi2O3-TiO2-NTs composite photocatalyst with high stable visible light catalytic activity, the method is to use the pulse electrodeposition method, and use the titanium dioxide nanotubes grown vertically on the titanium base as the carrier to prepare β-Bi2O3-TiO2-NTs composite photocatalyst 2 o 3 / TiO 2 -NTs composite photocatalyst. Described method specifically comprises the following steps:

[0041] (1) Set the thickness to 0.1mm and the size to 6cm 2 The surface of the pure titanium sheet is mechanically polished and cleaned;

[0042] (2) With 1.0wt%NaF and supporting electrolyte 2.0wt%Na 2 SO 4 As the solute, add alcohol additive 50 wt% polyethylene glycol (PG400), the solvent is the balance of water, and prepare the electrolyte;

[0043] (3) The titanium sheet in step (1) is used as the working electrode, the platinum sheet is used as the counter electrode, and the distance between the working electrode and the counter electrode is 1....

Embodiment 3

[0051] A β-Bi with High Stable Visible Light Catalytic Activity 2 o 3 / TiO 2 -The preparation method of NTs composite photocatalyst, this method is to adopt the pulse electrodeposition method, with the titania nanotube that grows vertically on the titanium base as carrier, prepare β-Bi 2 o 3 / TiO 2 -NTs composite photocatalyst. Described method specifically comprises the following steps:

[0052] (1) Set the thickness to 0.1mm and the size to 6cm 2 The surface of the pure titanium sheet is mechanically polished and cleaned;

[0053] (2) With 1.0wt%NaF and supporting electrolyte 2.0wt%Na 2 SO 4 As the solute, add alcohol additive 50 wt% polyethylene glycol (PG400), the solvent is the balance of water, and prepare the electrolyte;

[0054] (3) The titanium sheet in step (1) is used as the working electrode, the platinum sheet is used as the counter electrode, and the distance between the working electrode and the counter electrode is 1.0 cm, and the electrochemical anod...

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Abstract

The invention relates to a method for preparing beta-Bi2O3 / TiO2-NTs composite photocatalyst with high stability visible light catalytic activity. The method is characterized in that an electrochemical anodization method is adopted; a layer of upright and orderly TiO2-NTs nanotubes are pre-grown on a Ti plate for serving as a middle layer; Bi nano-particles are subjected to pulse electrodeposition in bismuth nitrate solution; and then the mixture is finally placed in oxygen atmosphere of a tube furnace for calcining to form a beta-Bi2O3 crystal form to prepare the beta-Bi2O3 / TiO2-NTs composite photocatalyst. Compared with the conventional alpha-Bi2O3 and TiO2 photocatalysts, the visible-light response of the beta-Bi2O3 / TiO2-NTs composite photocatalyst is prolonged to 495nm. Compared with the conventional beta-Bi2O3 photocatalyst, the valence band electric potential of the beta-Bi2O3 / TiO2-NTs composite photocatalyst is increased to 2.28ev, the hole oxidative capacity is strengthened, and the stability is greatly improved.

Description

technical field [0001] The invention relates to the field of material chemistry and the technical field of photoelectrochemical methods, and relates to a β-Bi with high stability and visible light catalytic activity 2 o 3 / TiO 2 -The preparation method of NTs composite photocatalyst material. Background technique [0002] Photocatalytic technology is an efficient and promising sewage treatment technology. As an important semiconductor with superior performance, titanium dioxide has the characteristics of strong mineralization ability, environmental friendliness, light stability, non-toxicity, low cost and easy availability, etc. It has a wide range of applications in photocatalytic degradation of organic pollutants. In particular, highly ordered one-dimensional (1D) titania nanotube arrays assembled by anodic oxidation in recent years are considered to be an ideal photoanode material. He can precisely control the size, has a larger specific surface area and higher surfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18B01J37/34
Inventor 张亚雷李德毅张永刚周雪飞郭肃晋
Owner TONGJI UNIV
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