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A kind of photocatalyst nano material and preparation method thereof

A technology of nanomaterials and photocatalysts, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., and can solve the problems of wide utilization of visible light photogenerated carriers and efficiency improvement

Active Publication Date: 2021-06-08
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its wide bandgap (Eg=3.2eV) limits the utilization of visible light and its rapid recombination of photogenerated carriers severely limits its wide application and efficiency improvement. Therefore, how to modify TiO 2 To expand the photoresponse range, constructing a fine structure that is conducive to charge transport is one of the scientific problems

Method used

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  • A kind of photocatalyst nano material and preparation method thereof
  • A kind of photocatalyst nano material and preparation method thereof
  • A kind of photocatalyst nano material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] As a method for preparing a nanomaterial in an embodiment of the present invention, the method includes the following steps:

[0050] (1) Polystyrene microspheres with an average particle size of 200 nm were synthesized by emulsion polymerization, and dried at 50°C for 24 hours to self-assemble monodisperse polystyrene microspheres (PS spheres) into polystyrene crystal templates (PS crystal template);

[0051] (2) Preparation of 3DOM Bi:TiO 2 Precursor solution: mix n-butyl titanate (10mL), ethylene glycol (40mL) and nitric acid (1mL) uniformly to obtain TiO 2 Precursor liquid; a certain amount of Bi(NO 3 ) 3 ·6H 2 O (Bi / Ti molar ratio is 0.5%), ethylene glycol (6mL) and dilute nitric acid (volume fraction 30-50%, 9mL) are mixed evenly to obtain a Bi precursor solution, and the Bi precursor solution is added to the precursor solution TiO 2 In the precursor solution, stir at room temperature for 3h, and age the mixed solution at 40°C for 5h to prepare 3DOM Bi:TiO 2...

experiment example 1

[0066] The morphology of the prepared PS spheres was observed with a field emission scanning electron microscope, and the results were as follows: figure 1 As shown in (e-f), the polystyrene microspheres have an average particle size of 200 nm and are neatly arranged.

[0067] 3DOM TiO 2 、3DOM Bi:TiO 2 、3DOM 6CDs / TiO 2 、3DOM 6CDs / Bi:TiO 2 The morphology of the composite photocatalyst was observed using a field emission scanning electron microscope, and the results were as follows: figure 1 As shown in (a-d), scanning electron microscope results show that both 3DOM Bi:TiO 2 The catalyst is still 3DOM 6CDs / Bi:TiO 2 The catalysts all maintain a clear and continuous three-dimensional macroporous structure.

[0068] X-ray powder diffraction test was carried out on it, and the results are as follows: figure 2 As shown, both 3DOM Bi:TiO 2 Or 3DOM6CDs / Bi:TiO 2 , X-ray powder diffraction patterns all show that anatase TiO with very high crystallinity is maintained 2 Due to t...

Embodiment 2

[0071] As a method for preparing nanomaterials in the embodiment of the present invention, the only difference between this embodiment and embodiment 1 is that the molar ratio of Bi to Ti is in the range of 0.25-1.5%, respectively 0.25%, 0.5%, and 1%. , 1.5%. The synthesized sample was named 3DOM 6CDs / Bi (n) :TiO 2 , where n represents the molar ratio of Bi / Ti.

[0072] The photocatalytic performance of the nanometer material of present embodiment, its ratio and its appearance, the relation of performance are as table 1 and Figure 7 , Figure 8 shown.

[0073] Table 1. 3DOM 6CDs / Bi with different Bi / Ti molar ratios (n) :TiO 2 preparation of

[0074]

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Abstract

The invention provides a nanomaterial and a preparation method thereof. The method comprises the following steps: drying polystyrene microspheres to obtain a polystyrene crystal template, using the polystyrene crystal as a template, and preparing different nanomaterials by a sol-gel method. TiO doped with Bi content 2 Composite precursor solution, 3DOM Bi:TiO obtained by negative pressure filling method combined with high temperature calcination 2 ; The mixed solution of citric acid and urea was processed to synthesize CDs by microwave method, and it was lyophilized and dialyzed to obtain CDs solution; the prepared 3DOM Bi:TiO 2 Mix and stir the catalyst and CDs solution to make CDs evenly dispersed in 3DOM Bi:TiO 2 in composite materials. The nanomaterial of the present invention not only has the enhanced visible light utilization rate brought by the 3DOM structure, high specific surface area, high active sites and other characteristics, but also has the excellent conductivity and excellent up-conversion effect of CDs and Bi 3+ The excellent photocatalytic performance that doping brings; The present invention adopts preferred Bi, TiO 2 , CDs ratio, the 3DOM CDs / Bi:TiO with the best photocatalytic performance was obtained 2 nanocomposites.

Description

technical field [0001] The invention relates to the field of preparation and utilization of clean energy materials, in particular to a photocatalyst nano material and a preparation method thereof. Background technique [0002] In order to maintain the sustainable development of human society, it is an urgent global problem to develop clean, efficient and environmentally friendly photocatalytic technology to combat the severe environmental pollution caused by the excessive consumption of fossil fuel resources. Among various photocatalysts, TiO 2 It is considered to be an ideal photocatalyst due to its strong chemical stability, strong biocompatibility, non-toxicity and low cost. However, its wide bandgap (Eg=3.2eV) limits the utilization of visible light and its rapid recombination of photogenerated carriers severely limits its wide application and efficiency improvement. Therefore, how to modify TiO 2 To expand the photoresponse range and construct a fine structure that is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/18B01J37/03B01J37/08C02F1/30C02F101/34C02F101/36C02F101/38
CPCB01J23/002B01J23/18B01J35/0013B01J35/0033B01J35/004B01J37/0018B01J37/036C02F1/30C02F2101/308C02F2101/34C02F2101/36C02F2101/38C02F2305/10
Inventor 陈旖勃李菁凤刘兆清王铸
Owner GUANGZHOU UNIVERSITY
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