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Visible light response cobalt-doped anatase TiO2 mesocrystal, and preparation method and photocatalytic application thereof

An anatase, visible light technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. low rate, long cycle and other problems, to achieve the effect of good visible light photodegradation activity, good dispersibility and short cycle

Inactive Publication Date: 2014-02-19
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current preparation methods of high-quality mesogens are not mature enough, and the cycle is long
In addition, the ultraviolet light in sunlight only accounts for about 4%, and most of it is still visible light, while anatase TiO 2 Strong absorption only in the ultraviolet region, low utilization rate of visible light

Method used

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  • Visible light response cobalt-doped anatase TiO2 mesocrystal, and preparation method and photocatalytic application thereof
  • Visible light response cobalt-doped anatase TiO2 mesocrystal, and preparation method and photocatalytic application thereof
  • Visible light response cobalt-doped anatase TiO2 mesocrystal, and preparation method and photocatalytic application thereof

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preparation example Construction

[0023] combine Figure 4 , the present invention visible-light responsive cobalt-doped anatase TiO 2 The preparation method of mesogen comprises the following steps:

[0024] Step 1, mixing and stirring the butyl titanate precursor and tetraethyl orthosilicate for 1 hour, the mass ratio of tetraethyl orthosilicate to butyl titanate is 0.04:1;

[0025] Step 2, stirring and dissolving sodium acetate trihydrate and cobalt acetate tetrahydrate in acetic acid for 1 hour, the mass ratio of sodium acetate trihydrate to butyl titanate is 1:5, and the mass ratio of cobalt acetate tetrahydrate to butyl titanate 3-40 mg / g, the mass ratio of acetic acid to butyl titanate is 2:1;

[0026] Step 3, slowly add the solution obtained in step 2 to the system obtained in step 1, and continue to stir for 1 hour;

[0027] Step 4, transfer the reaction system obtained in step 3 to a reaction kettle, and react at 180° C. for 10-14 hours;

[0028] Step 5, the product obtained in step 4 is centrifu...

Embodiment 1

[0031] Step 1, mixing 5.0 g of butyl titanate precursor with 0.2 g of tetraethyl orthosilicate and stirring for 1 hour;

[0032] Step 2, stirring and dissolving 1.0 g of sodium acetate trihydrate and 0.015 g of cobalt acetate tetrahydrate in 10 g of glacial acetic acid for 1 hour;

[0033] Step 3, slowly add the solution obtained in step 2 to the system obtained in step 1, and continue to stir for 1 hour;

[0034] Step 4, transfer the reaction system obtained in step 3 to a reaction kettle, and react at 180° C. for 12 hours;

[0035] Step 5, the product obtained in step 4 is centrifuged and washed with deionized water and absolute ethanol, and then dried to obtain the cobalt-doped anatase TiO that responds to visible light. 2 mesomorph.

[0036] Visible-light-responsive cobalt-doped anatase TiO 2 The photocatalytic application of mesogens is: 0.03 g cobalt doped anatase TiO 2 The mesogenic powder was dispersed in 30 ml of 10 mg / L Rhodamine B solution, stirred for half an h...

Embodiment 2

[0039] Step 1, mixing 5.0 grams of butyl titanate precursor with 0.2 grams of tetraethyl orthosilicate and stirring for 1 hour;

[0040] Step 2, stirring and dissolving 1.0 g of sodium acetate trihydrate and 0.1 g of cobalt acetate tetrahydrate in 10 g of glacial acetic acid for 1 hour;

[0041] Step 3, slowly add the solution obtained in step 2 to the system obtained in step 1, and continue to stir for 1 hour;

[0042]Step 4, transfer the reaction system obtained in step 3 to a reaction kettle, and react at 180° C. for 10 hours;

[0043] Step 5, the product obtained in step 4 is centrifuged and washed with deionized water and absolute ethanol, and then dried to obtain the cobalt-doped anatase TiO that responds to visible light. 2 mesomorph.

[0044] Visible-light-responsive cobalt-doped anatase TiO 2 The photocatalytic application of the mesogen is the same as in Example 1.

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Abstract

The invention discloses a visible light response cobalt-doped anatase TiO2 mesocrystal, and preparation and application thereof. The visible light response cobalt-doped anatase TiO2 mesocrystal is formed by doping cobalt into anatase TiO2 mesocrystal, and the mesocrystal is shaped like a uniform ingot and has the length of 80 to 120 nm and the width of 25 to 40 nm. The visible light response cobalt-doped anatase TiO2 mesocrystal is prepared by the following steps: mixing and stirring a butyl titanate precursor and tetraethyl orthosilicate; adding sodium acetate trihydrate and cobaltous acetate tetrahydrate into acetic acid, stirring and dissolving; mixing the two mixtures; transferring to a reaction kettle; after reaction is finished, washing and drying. According to the invention, large-scale synthesis of the anatase TiO2 mesocrystal is realized; the cobalt is doped into the anatase TiO2 mesocrystalthe light response range of the anatase TiO2 mesocrystal is widened to a visible light region; and the utilization ratio of visible light is increased. The method is simple and convenient to operate and short in period; the mesocrystal has uniform appearance, high dispersibility and high purity. The mesocrystal serves as a photocatalyst for degrading pollutants through photocatalysis, and the result shows that the mesocrystal has excellent visible light degradation activity and has a good application value in the environmental protection fields of waste water treatment and the like.

Description

technical field [0001] The invention belongs to the field of photocatalytic materials, and the invention provides a cobalt-doped anatase TiO responding to visible light 2 Mesogens and methods for their preparation and photocatalytic applications. Background technique [0002] In recent years, with the rapid development of human society and rapid economic growth, the energy consumption represented by oil and coal has doubled, and the resulting environmental pollution and energy crisis have become increasingly serious, which has become an urgent need for human survival. key issues to be resolved. Studies have shown that it is an important way to solve the global environmental degradation and energy crisis by photocatalytically degrading pollutants and making full use of cheap and "green" sunlight. The development of highly active and stable photocatalytic materials is a current research hotspot, anatase TiO 2 As a typical semiconductor, it is the most researched and conside...

Claims

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Application Information

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IPC IPC(8): B01J23/75A62D3/17A62D101/26A62D101/28
Inventor 姚霞喜刘孝恒
Owner NANJING UNIV OF SCI & TECH
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