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A kind of graphene/titanium dioxide composite material with hollow microspheres and preparation method thereof

A graphene composite and composite material technology, applied in the preparation of microspheres, chemical instruments and methods, microcapsule preparations, etc., can solve the problems of cumbersome synthesis process, limited application scope, small specific surface area, etc., and achieves simple operation method and cost. Inexpensive, large surface area effect

Active Publication Date: 2017-10-17
哈尔滨悟山青环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, on the one hand, these reported graphene / titania composite materials often have a single structure, small specific surface area, and poor water dispersibility; greatly limited its scope of application

Method used

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  • A kind of graphene/titanium dioxide composite material with hollow microspheres and preparation method thereof
  • A kind of graphene/titanium dioxide composite material with hollow microspheres and preparation method thereof
  • A kind of graphene/titanium dioxide composite material with hollow microspheres and preparation method thereof

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Effect test

Embodiment 1

[0025] Embodiment 1: The method provided by the invention is used to prepare graphene / titanium dioxide hollow composite microspheres

[0026] (1) Silica colloidal microspheres with an average particle size of 220 nm were prepared according to a slightly modified Stöber method [(a) Wang, W.; Gu, B.; Liang, L.; Hamilton, W. A. J. Phys. Chem. B 2003, 107 , 3400-3404. (b) Wang, W.; Gu, B.; Liang, L.; Hamilton, W. A. J. Phys. Chem. B 2003, 107 , 12113-12117.].

[0027] (2) The silica microspheres prepared in step (1) were coated with a layer of graphene oxide by an ultrasonic-assisted self-assembly method to obtain a silica / graphene oxide composite microsphere with an average particle size of 220 nm ( Xiao, W.; Zhang, Y.; Liu, B. ACS Appl. Mater. Interfaces 2015, 7 , 6041-6046.).

[0028] (3) Ultrasonic disperse 10 mg of the silica / graphene oxide composite microspheres in step (2) in 2 mL of water, then add it dropwise to 20 mL of absolute ethanol under ultrasonic conditio...

Embodiment 2

[0031] Embodiment 2: Graphene / titanium dioxide hollow composite microspheres prepared in the present invention are used for the photodegradation of methylene blue:

[0032] (1) Prepare a methylene blue aqueous solution with a concentration of 10 mg / L, take 48 mL of it and add it to the reaction tube, and then ultrasonically disperse 5 mg of the graphene / titanium dioxide hollow composite microsphere sample prepared in Example 1 in 2 mL with a concentration of 10 mg / L methylene blue aqueous solution, and then added dropwise to the above reaction tube under stirring conditions.

[0033] (2) Place the reaction tube in step (1) in a photochemical reaction apparatus (the brand model is Qiaoyue JOYN-GHX-A), use a high-pressure mercury lamp as the ultraviolet light source, set the power to 300 W, and stir vigorously The photocatalytic reaction was carried out under certain conditions, and then 4 mL of the dispersion liquid was pipetted from the reaction system every 5 min and placed i...

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Abstract

The invention relates to graphene / titanium dioxide composite adopting a unique hollow microspherical structure and a simple preparation method convenient to implement and belongs to the technical field of synthesis and preparation of graphene-based micro-nano composite. Firstly, an improved Stober method is adopted for preparing silicon dioxide microspheres, then each silicon dioxide microsphere is coated with an oxidized graphene layer with an ultrasonic assisted self-assembly method, titanium tetrafluoride is taken as a precursor, titanium dioxide is precipitated and crystallized on surfaces of silicon dioxide / oxidized graphene composite microspheres with a solvothermal method, silicon dioxide inner cores are dissolved and removed, the oxidized graphene component coating the spheres is further reduced, and accordingly, the graphene / titanium dioxide composite hollow microspheres are prepared. The composite hollow microspheres show good water dispersibility, has efficient catalytic activity for light degradation of organic dye and have wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of synthesis and preparation of graphene-based micro-nano composite materials, and in particular relates to a graphene / titanium dioxide composite material with hollow microspheres and a preparation method thereof. Background technique [0002] Since the discovery of graphene, its unique structural characteristics and excellent electronic properties have made the development and application of graphene-based composite materials a hot spot in the field of material science in recent years. In previous studies, people often loaded various functional nanoparticles (such as noble metals, metal oxides, metal sulfides, polymer nanoparticles, etc.) on the surface of graphene oxide sheets, and then reduced them to graphene components. Graphene-based composite materials have been obtained and widely used in catalysis, sensing, drug sustained release, and energy storage. However, adopting this strategy to synthesize is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/18B01J35/08B01J13/02C02F1/32C02F1/58
CPCB01J13/02B01J21/18B01J35/08C02F1/325C02F1/725C02F2101/308C02F2305/10
Inventor 肖巍张艳华周文杰
Owner 哈尔滨悟山青环保科技有限公司
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