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Synthesis of CeO2-based solid solution nanometer material and application of nanomaterial to catalytic degradation of dye

A technology of nanomaterials and solid solutions, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems affecting sunlight transmission, water color changes, ecological environment, etc. Deterioration and other problems, to achieve the effect of good catalytic performance, adjustable composition, and small grain size

Active Publication Date: 2013-08-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its aqueous solution is a commonly used indicator. Industrial wastewater generally contains pollutants such as acid orange 7. It not only pollutes the environment, but also causes changes in the color of the water body, affects the penetration of sunlight, and causes the deterioration of the ecological environment.

Method used

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  • Synthesis of CeO2-based solid solution nanometer material and application of nanomaterial to catalytic degradation of dye
  • Synthesis of CeO2-based solid solution nanometer material and application of nanomaterial to catalytic degradation of dye
  • Synthesis of CeO2-based solid solution nanometer material and application of nanomaterial to catalytic degradation of dye

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 8mmolCe(NO 3 ) 3 ·6H 2 O, 1mmolLa(NO 3 ) 3 ·6H 2 O and 3mmol NaOH were dissolved in 10mL of deionized water, put into the reaction kettle, and reacted in an oven at 240°C for 72h; Dry for 24h to get CeO 2 Based solid solution nanomaterials, denoted as Ce-La-D. Prepared CeO 2 The general structural formula of the base solid solution nanomaterial is: (CeO 2 ) 0.89 (LaO 1.5 ) 0.11 ; The structure of the nanometer material is an octahedron with a uniform shape.

[0023] Adjust the amount of raw materials and prepare CeO with a molar ratio of Ce:La=1:1, 2:1, 4:1 according to the above conditions, that is, the doping ratios are 0.5, 0.33, and 0.2 respectively. 2 Based solid solution nanomaterials, respectively marked as Ce-La-A, Ce-La-B, Ce-La-C.

[0024] The prepared product was qualitatively analyzed by ShimaduXRD-6000 powder X-ray diffractometer, and the morphology of the sample was analyzed by JEOLJEM-2100 transmission electron microscope and high-resol...

Embodiment 2

[0033] Weigh 1mmolCe(NO 3 ) 3 ·6H 2 O, 1mmolY (NO 3 ) 3 ·6H 2 O (molar ratio Ce:Y=1:1) and 3mmolNa 3 PO 4 Dissolve it in 10mL of deionized water, put it into a reaction kettle, and react in an oven at 240°C for 72h; after cooling, wash it with deionized water to pH=7, and dry the obtained solid in an oven at 60°C for 24h. That is, CeO 2 Based solid solution nanomaterials, denoted as Ce-Y-A. Prepared CeO 2 The general structural formula of the base solid solution nanomaterial is: (CeO 2 ) 0.5 (YO 1.5 ) 0.5 The structure of the nanometer material is octahedron with uniform appearance, and the grain size is 10-40nm.

[0034] Adjust the amount of raw materials and prepare CeO with a molar ratio of Ce:Y=2:1, 4:1, 8:1, and 9:1 according to the above conditions, that is, the doping ratios are 0.33, 0.2, 0.11, and 0.1 respectively. 2 Based solid solution nanomaterials, respectively marked as Ce-Y-B, Ce-Y-C, Ce-Y-D, Ce-Y-E.

[0035] The same XRD peaks indicate that solid...

Embodiment 3

[0038] Weigh 9mmolCe(NO 3 ) 3 ·6H 2 O, 1 mmol BiCl 3 ·6H 2 O (molar ratio Ce:Bi=9:1) and 3mmol NaOH were dissolved in 10mL of deionized water, placed in a reaction kettle, and reacted in an oven at 240°C for 72h; 7. Dry the obtained solid in an oven at 60°C for 24 hours to obtain CeO 2 based solid solution nanomaterials.

[0039] CeO prepared above 2 The general structural formula of the base solid solution nanomaterial is: (CeO 2 ) 0.9 (BiO 1.5 ) 0.1 The structure of the nanometer material is octahedron with uniform appearance, and the grain size is 10-40nm.

[0040] XRD shows that the solid solution (CeO 2 ) 0.9 (BiO 1.5 ) 0.1 .

[0041] The above-prepared CeO 2 Based solid solution nanomaterials are used in the photocatalytic degradation of acid orange 7, the reaction conditions are: take CeO 2 Put 5 mg of base solid solution nanomaterials in a quartz cuvette, then add 3 mL of Acid Orange 7 solution with a concentration of 10 ppm, put it into a visible ligh...

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Abstract

The invention discloses synthesis of a CeO2-based solid solution nanometer material and an application of the nanometer material to catalytic degradation of dye, belonging to the technical field of nanocrystal preparation. A NaOH solution is used as a precipitator, octahedron CeO2 nanocrystals with different doping proportions are prepared by a high temperature hydrothermal synthesis method, and the octahedron CeO2 nanocrystals are used as catalysts for photo-catalyzing and degrading acid orange 7. The CeO2-based solid solution nanometer material prepared by using the synthesis method disclosed by the invention is an octahedron with uniform feature, the doping elements and doping proportions generate no effect on the feature of a solid solution, and the solid solution is small in crystal particle dimension, adjustable in ingredients, good in dispersibility, stable and uniform in structure, high in single synthesis yield and simple in preparation technique. The CeO2-based solid solution nanometer material is used for photo-catalyzing and degrading dye molecules, and visible light is directly utilized to obtain a high photocatalytic degradation effect, and 60-90 percent of the acid orange 7 can be catalyzed and degraded by the visual light within 2-4 hours. The CeO2-based solid solution nanometer material is a novel photocatalyst composite material with good catalytic performance, good environment-friendliness and low cost.

Description

technical field [0001] The invention belongs to the technical field of nanocrystal preparation, in particular to a CeO 2 Synthesis of based solid solution nanomaterials and their application in catalytic degradation of dyes. Background technique [0002] In recent years, CeO 2 The synthesis of nanostructures has attracted widespread interest because CeO 2 It has a wide range of applications in oxygen sensors, electrodes of solid oxide fuel cells, three-way catalysts in automobile exhaust emissions, and so on. In practical applications, by doping transition metals into CeO 2 lattice, can improve the CeO 2 The luminescent properties, catalytic performance, or improve its thermal stability or oxygen storage and release capacity, etc. The recent research hotspot is to enter CeO by doping rare earth elements 2 , can increase the CeO 2 Catalytic performance, luminescent performance and so on. Such as Eu 3+ (Sm 3+ ,Tb 3+ ) doped into CeO 2 In , the CeO can be improved b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18B01J23/10A62D3/17A62D101/28
Inventor 陆军曾婉艺
Owner BEIJING UNIV OF CHEM TECH
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