Rare earth element-doped bismuth oxide photocatalyst and preparation method thereof

A technology of rare earth elements and photocatalysts, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of application limitations, band gap width, etc., and achieve good Effects of light absorption, improved adsorption capacity, and simple production method

Inactive Publication Date: 2012-09-12
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Titanium dioxide is currently the most widely studied photocatalyst, but its application is limited due to its wide band gap (3.00-3.22eV). In fact, many semiconductor catalysts also have good photocatalytic activity.
However, pure bismuth oxide photocatalytic materials only have strong photocatalytic activity under ultraviolet light.

Method used

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  • Rare earth element-doped bismuth oxide photocatalyst and preparation method thereof
  • Rare earth element-doped bismuth oxide photocatalyst and preparation method thereof
  • Rare earth element-doped bismuth oxide photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 0.5845g of ethylenediaminetetraacetic acid into 20ml of distilled water, add 0.75ml of ammonia water, heat and stir until dissolved, add 0.233g of bismuth oxide, 0.054g of cerium nitrate hexahydrate and 0.01g of ionic liquid 1-octyl-3- Methylimidazole tetrafluoroborate, heated in a water bath at 60°C, stirred until dissolved, formed a dry gel, crushed, put into a muffle furnace and burned at 400°C for 5 hours, and ground to obtain a bismuth oxide doped with cerium catalyst.

[0024] figure 2 The X-ray diffraction pattern of the bismuth oxide type catalyst doped with cerium is given. Figure 5 The ultraviolet-visible diffuse reflectance spectrum of bismuth oxide catalyst doped with cerium is given.

Embodiment 2

[0026] Weigh 0.5845g of ethylenediaminetetraacetic acid into 20ml of distilled water, add 0.75ml of ammonia water, heat and stir until dissolved, add 0.233g of bismuth oxide, 0.044g of europium oxide and 0.01g of ionic liquid 1-octyl-3-methyl Imidazolium tetrafluoroborate was heated in a water bath at 90°C, stirred until dissolved, formed into a xerogel, crushed, put into a muffle furnace and burned at 500°C for 3 hours, and ground to obtain a bismuth oxide catalyst doped with europium.

[0027] figure 1 An X-ray diffraction pattern of a bismuth oxide-type catalyst doped with europium is given. Figure 4 The ultraviolet-visible diffuse reflectance spectrum of the bismuth oxide type catalyst doped with europium is given.

Embodiment 3

[0029] Weigh 0.5845g of ethylenediaminetetraacetic acid and add it to 20ml of distilled water, add 0.75ml of ammonia water, heat and stir until dissolved, add 0.233g of bismuth oxide, 0.015g of europium oxide, 0.036g of cerium nitrate hexahydrate and 0.01g of ionic liquid 1- Octyl-3-methylimidazolium tetrafluoroborate, heated in a water bath at 60°C, stirred until dissolved, formed a xerogel, crushed, put into a muffle furnace, burned at 400°C for 4 hours, and ground to obtain a composite blend Bismuth oxide type catalyst doped with europium and cerium.

[0030] image 3 The X-ray diffraction pattern of the bismuth oxide-type catalyst compositely doped with europium and cerium is given. Figure 6 The ultraviolet-visible diffuse reflectance spectrum of the compound-doped bismuth oxide catalyst is given.

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Abstract

The invention discloses a rare earth element-doped bismuth oxide photocatalyst and a preparation method thereof and belongs to the technical field of photocatalysts for treating organic pollutants. The rare earth element-doped bismuth oxide photocatalyst has active components of bismuth oxide and one or more rare earth elements, wherein the one or more rare earth elements comprise europium or/and cerium. The preparation method comprises the following steps of adding ethylenediaminetetraacetic acid and ammonia water into distilled water, stirring with heating until full dissolution, adding bismuth oxide, ionic liquids and europium oxide or/cerous nitrate into the mixed solution, heating in a water bath kettle to obtain xerogel and carrying out sintering and grinding to obtain rare earth element-doped bismuth oxide photocatalyst particles. Through doping of different metal ions and ionic liquids having different concentrations, a high adsorption capacity and a high light absorption capacity of the rare earth element-doped bismuth oxide photocatalyst are improved and the rare earth element-doped bismuth oxide photocatalyst is a novel photocatalyst having good light absorptivity and a strong degrading capability in the visible region. The preparation method is simple, allows mild conditions and does not produce secondary pollution in preparation.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts for treating organic pollutants, in particular to a brand-new bismuth oxide photocatalyst doped with rare earth elements, which has a good removal effect on organic pollutants. Background technique [0002] Photocatalytic technology mainly converts light energy into chemical energy and degrades pollutants. Titanium dioxide is currently the most widely studied photocatalyst, but its application is limited due to its wide band gap (3.00-3.22eV). In fact, many semiconductor catalysts also have good photocatalytic activity. The energy band structure of the semiconductor is discontinuous, and the region from the top of the valence band full of electrons to the bottom of the empty conduction band becomes a band gap. When the semiconductor absorbs photons with energy greater than the width of the band gap, the transition of electrons will have a lifetime in the range of nanoseconds. Photogenerate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18
Inventor 张凤君彭新晶刘卓婧孙玉生
Owner JILIN UNIV
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