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Graphene/titanium dioxide composite adopting hollow microspherical structure and preparation method of composite

A graphene composite and titanium dioxide technology, applied in the direction of microsphere preparation, chemical instruments and methods, microcapsule preparation, etc., can solve the problems of limited application range, cumbersome synthesis process, small specific surface area, etc., and achieve low cost and simple operation method , the effect of large specific surface area

Active Publication Date: 2015-11-18
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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  • Graphene/titanium dioxide composite adopting hollow microspherical structure and preparation method of composite
  • Graphene/titanium dioxide composite adopting hollow microspherical structure and preparation method of composite
  • Graphene/titanium dioxide composite adopting hollow microspherical structure and preparation method of composite

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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 improved St?ber 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 ultrasonic-assisted self-assembly method to obtain a silica / graphene oxide composite microsphere with an average particle size of 220nm (Xiao , W.; Zhang, Y.; Liu, B. ACS Appl. Mater. Interfaces 2015, 7 , 6041-6046.).

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

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, get 48 mL of it and add it to the reaction tube, and then ultrasonically disperse the 5 mg graphene / titanium dioxide hollow composite microsphere sample prepared in Example 1 in 2 mL of methylene blue with a concentration of 10 mg / L aqueous solution, and then added dropwise to the above-mentioned reaction tube under stirring condition.

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

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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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IPC IPC(8): B01J21/18B01J35/08B01J13/02C02F1/32C02F1/58
CPCB01J13/02C02F1/325C02F1/725B01J21/18C02F2101/308C02F2305/10B01J35/51
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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