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Graphene-bismuth phosphate aerogel and preparation method thereof

A graphene and bismuth phosphate technology, applied in the field of VOCs treatment, can solve the problems such as the reduction of the conductivity of graphene's excellent performance, and achieve the effects of overcoming adsorption saturation and non-recyclability, suppressing accumulation, and improving adsorption performance and

Inactive Publication Date: 2020-12-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the use of GO as a precursor in the preparation of graphene airgel, the cost is greatly reduced, but the disadvantages are also very clear. The chemical converted graphene or chemical reduced graphene obtained by GO reduction is not graphene in the true sense, and the interlayers are easy to There are various defect stacks, etc., which significantly reduce the excellent properties of graphene (such as electrical conductivity)

Method used

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  • Graphene-bismuth phosphate aerogel and preparation method thereof
  • Graphene-bismuth phosphate aerogel and preparation method thereof
  • Graphene-bismuth phosphate aerogel and preparation method thereof

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Effect test

Embodiment 1

[0097] The present embodiment provides a kind of preparation method of graphene-bismuth phosphate airgel, and specific process is as follows:

[0098] 1) Add 0.15mmol Bi(NO 3 ) 3 ·5H 2 O was added to 10mL of ethylene glycol and ultrasonicated for 10min, then 20mL of graphene oxide solution was added and stirred for 10min, so that Bi(NO 3 ) 3 Uniformly dispersed in the graphene oxide solution to obtain the first mixed solution; wherein, the concentration of graphene oxide in the graphene oxide solution is 1mg / mL;

[0099] 2) Add 0.54mmol NaH to the first mixed solution 2 PO 4 2H 2 O obtains a suspension, and the resulting suspension is stirred for 1h to obtain a precursor solution;

[0100] 3) The precursor solution was hydrothermally heated at 160°C for 24 hours to obtain a composite hydrogel;

[0101] 4) After soaking the composite hydrogel in deionized water for 2-3 days, the graphene-bismuth phosphate airgel (ie 70%-BiPO 4 / GA); wherein, the freeze-drying treatment...

Embodiment 2

[0109] This embodiment provides a kind of preparation method of graphene-bismuth phosphate airgel, and specific process is identical with embodiment 1, and difference is only that Bi(NO 3 ) 3 ·5H 2 The amount of O used is 0.2mmol, NaH 2 PO 4 2H 2 O consumption is 0.72mmol.

[0110] The graphene-bismuth phosphate airgel prepared in embodiment 2 (i.e. 75%-BiPO 4 / GA) the mass content of the bismuth phosphate is 75%, and its SEM pattern is as figure 2 shown.

Embodiment 3

[0112] This embodiment provides a kind of preparation method of graphene-bismuth phosphate airgel, and specific process is identical with embodiment 1, and difference is only that Bi(NO 3 ) 3 ·5H 2 O dosage is 0.26mmol, NaH 2 PO 4 2H 2 O consumption is 0.936mmol.

[0113] The graphene-bismuth phosphate airgel prepared in embodiment 3 (i.e. 80%-BiPO 4 / GA) has a bismuth phosphate content of 80%, and its SEM spectrum is as image 3 shown.

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Abstract

The invention provides graphene-bismuth phosphate aerogel and a preparation method thereof. The method comprises the following steps: 1), adding a graphene oxide solution into an ethylene glycol solution containing Bi(NO3)3 to obtain a first mixed solution, the use amount ratio of Bi(NO3)3 to the graphene oxide is 0.15 mmol / 0.037 mmol: 20mg, and the graphene oxide being prepared by an improved Hummer method; 2), adding NaH2PO4.2H2O into the first mixed solution to obtain a precursor solution, the molar ratio of NaH2PO4 to Bi(NO3)3 being 3.6: 1; 3), performing hydrothermal treatment on the precursor solution at 160 DEG C for 24 hours to obtain composite hydrogel; and 4), soaking the composite hydrogel in deionized water, taking out the product, and performing freeze-drying to obtain the aerogel. According to the method, graphene lamella accumulation is effectively inhibited, and the prepared aerogel bismuth phosphate nanorods are uniformly distributed on graphene lamellas.

Description

technical field [0001] The invention belongs to the field of VOCs control, and relates to a preparation method of a three-dimensional structure airgel photocatalyst, in particular to a graphene-bismuth phosphate airgel and a preparation method thereof. Background technique [0002] The discharge of industrial phenolic pollutants has become one of the main sources of man-made air pollution. How to maintain normal temperature, save energy and thoroughly purify water is currently a hot spot and key technology in water purification research. In recent years, adsorption enrichment-catalytic decomposition has gradually become a widely recognized method. [0003] When traditional photocatalytic materials are used to degrade VOCs in the gas phase, due to their weak adsorption capacity and poor ability to enrich and oxidize VOCs molecules, there are defects such as low degradation efficiency. Photocatalysts with a three-dimensional network structure usually have a large specific sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37C01B32/184C01B32/198B01J27/186B82Y40/00B82Y30/00
CPCC01B25/37C01B32/184C01B32/198B01J27/186B82Y40/00B82Y30/00C01P2004/80C01P2004/16B01J35/39
Inventor 姚文清唐诗卉谭瑞琴
Owner TSINGHUA UNIV
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