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Graphene composite titanium dioxide photocatalyst capable of magnetic separation and recovery, and preparation method thereof

A graphene composite, magnetic graphene technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of poor properties, no graphene conductive properties, stability, etc., and achieve strong magnetic properties. , The preparation process is simple and feasible, and the properties are stable.

Active Publication Date: 2012-06-13
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But what this patent involves is anatase titanium dioxide, and its properties are not as stable as rutile; on the other hand, the matrix of the ternary composite photocatalyst used in this patent is activated carbon, and its specific surface area is much smaller than that of graphene (activated carbon : 700m 2 / g, graphene: 2300m 2 / g), and does not have the good conductive properties of graphene

Method used

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  • Graphene composite titanium dioxide photocatalyst capable of magnetic separation and recovery, and preparation method thereof
  • Graphene composite titanium dioxide photocatalyst capable of magnetic separation and recovery, and preparation method thereof
  • Graphene composite titanium dioxide photocatalyst capable of magnetic separation and recovery, and preparation method thereof

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preparation example Construction

[0021] The preparation method of the graphene composite titanium dioxide photocatalyst that can be magnetically separated and recovered comprises the following steps:

[0022] 1) Disperse 10-100mg graphene oxide in alcohol solvent, ultrasonically treat for 0.5-2 hours, add 0.2-1.0g ferric salt, stir for 1-2 hours, add 1-5g reducing agent and 1-5g surface active agent, stirred for 0.5 to 1 hour, mixed evenly, transferred to a stainless steel reaction kettle, reacted at 100 to 200°C for 10 to 24 hours, rinsed with ethanol and centrifuged, dried in vacuum at 50°C to obtain magnetic graphene powder;

[0023] 2) Add 1-10ml of titanium compound dropwise into the mixed solution of reducing alcohol and acid with a volume ratio of 1:1-1:10, stir until clear, add water to a total volume of 20-80ml, and stir for 0.5 ~1 hour, transfer to a stainless steel reaction kettle for hydrothermal reaction at 80-200°C for 0.5-24 hours, rinse with deionized water and centrifuge, add ethanol and mix ...

Embodiment 1

[0027] 1) Disperse 10mg of graphene oxide in alcohol solvent, sonicate for 0.5 hours, add 0.2g of ferric sulfate, stir for 1 hour, add 1g of sodium acetate and 1g of polyvinyl alcohol, stir for 0.5 hours, mix well, transfer to a stainless steel reactor , reacted at 100°C for 10 hours, rinsed with ethanol and centrifuged, and dried in vacuum at 50°C to obtain magnetic graphene powder;

[0028] 2) Add 1ml of butyl titanate dropwise to a mixed solution of ethanol and hydrochloric acid with a volume ratio of 1:1, stir until clear, add water to a total volume of 20ml, stir for 0.5 hours, transfer to a stainless steel reaction kettle at 80 Hydrothermal reaction at ℃ for 0.5 hours, rinse with deionized water and centrifuge, add ethanol and mix to obtain rutile titanium dioxide sol;

[0029] 3) The magnetic graphene was impregnated in the rutile-type titania sol, stirred for 0.5 hours, and dried to powder by rotary evaporation to obtain a titania-supported magnetic graphene composite ...

Embodiment 2

[0031] 1) Disperse 100mg of graphene oxide in alcohol solvent, sonicate for 2 hours, add 1.0g of ferric chloride, stir for 2 hours, add 5g of potassium acetate and 5g of polyethylene glycol, stir for 1 hour, mix well, transfer to stainless steel In the reaction kettle, react at 200°C for 24 hours, rinse with ethanol and centrifuge, and dry in vacuum at 50°C to obtain magnetic graphene powder;

[0032] 2) Add 10ml of titanium chloride dropwise to the mixed solution of propanol and sulfuric acid with a volume ratio of 1:10, stir until clear, add water to a total volume of 80ml, stir for 1 hour, transfer to a stainless steel reaction kettle at 200°C Hydrothermal reaction at high temperature for 24 hours, rinse with deionized water and centrifuge, add ethanol and mix to obtain rutile titanium dioxide sol;

[0033] 3) The magnetic graphene was impregnated in the rutile-type titania sol, stirred for 2 hours, and dried to powder by rotary evaporation to obtain a titania-supported magne...

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Abstract

The present invention relates to a graphene composite titanium dioxide photocatalyst capable of magnetic separation and recovery, and a preparation method thereof. The photocatalyst is synthesized by a two-step hydrothermal method, wherein graphene and magnetic particles are compounded to prepare magnetic graphene, the magnetic graphene is compounded with titanium dioxide nanoparticles synthesized by a hydrothermal method to prepare the three-element composite photocatalyst. The photocatalyst comprises three parts of the graphene, the titanium dioxide, and the magnetic nanoparticles, wherein the magnetic nanoparticles are loaded on the graphene lamellas to form the magnetic graphene having large specific surface area and magnetism, the rutile type titanium dioxide has a three-dimensional ordered nanostructure, and is loaded on the magnetic graphene lamellas to form the graphene composite rutile type titanium dioxide photocatalyst with the characteristic of magnetic separation, whereinthe photocatalyst has the large specific surface area, the nanoparticles have the magnetism, the photocatalyst can be separated and recovered, and has the efficient catalytic performance.

Description

technical field [0001] The invention relates to a graphene composite titanium dioxide photocatalyst capable of magnetic separation and recovery and a preparation method thereof, belonging to the fields of photocatalytic preparation and environmental protection. Background technique [0002] In the field of photocatalysis, titanium dioxide nanomaterials with good photocatalytic properties have very broad application prospects. Usually in the photocatalytic process, ultraviolet light is used to irradiate the titanium dioxide photocatalyst. Since titanium dioxide is a semiconductor, it has a full valence band and an empty conduction band. , generate photogenerated electrons and holes, react with organic pollutants attached to the titanium dioxide photocatalyst, and degrade into small inorganic molecules, so as to achieve the purpose of photodegradation. Titanium dioxide has three crystal forms: anatase, rutile and brookite. Due to the unstable structure of brookite, it is a me...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J37/10C02F1/32
CPCY02W10/37
Inventor 姜银珠胡梅娟严密
Owner ZHEJIANG UNIV
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