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Graphene oxide/titanium dioxide nano-needle composite material and preparation method and application thereof

A technology of titanium dioxide and composite materials, which is applied in the field of materials, can solve the problems of low photocatalytic efficiency, small specific surface area, and easy agglomeration, and achieve high photocatalytic efficiency, strong light capture ability, and improved utilization efficiency.

Active Publication Date: 2016-11-09
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the graphene and nano-titanium dioxide composite materials currently prepared mainly exist in the form of spherical, which is prone to agglomeration, has a small specific surface area, and has low photocatalytic efficiency.

Method used

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  • Graphene oxide/titanium dioxide nano-needle composite material and preparation method and application thereof
  • Graphene oxide/titanium dioxide nano-needle composite material and preparation method and application thereof
  • Graphene oxide/titanium dioxide nano-needle composite material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A graphene oxide / titanium dioxide nanoneedle composite material of the present invention, with graphene oxide as a carrier, titanium dioxide nanoneedles are vertically distributed on the surface of graphene oxide, wherein the titanium dioxide nanoneedles have a diameter of 10nm to 15nm and a length of 400nm to 500nm; The mass ratio of graphene and titanium dioxide nanoneedles is 1:140.8.

[0034] A preparation method of the graphene oxide / titanium dioxide nanoneedle composite material of the above-mentioned present embodiment, comprising the steps of:

[0035] (1) Add 2 mg of graphene oxide into 20 mL of ethylene glycol solution, and disperse it uniformly by ultrasonication for 100 min to prepare a graphene oxide dispersion, wherein the concentration of the graphene oxide dispersion is 0.1 g / L.

[0036] (2) Add 1.0 g of isopropyl titanate to 5 mL of concentrated hydrochloric acid with a mass concentration of 36.5%, and add 15 mL of ultrapure water while stirring to obta...

Embodiment 2

[0043] A graphene oxide / titanium dioxide nanoneedle composite material of the present invention, with graphene oxide as a carrier, titanium dioxide nanoneedles are vertically distributed on the surface of graphene oxide, wherein the titanium dioxide nanoneedles have a diameter of 10nm to 15nm and a length of 400nm to 500nm; The mass ratio of graphene and titanium dioxide nanoneedles is 1:14.08.

[0044] A preparation method of the graphene oxide / titanium dioxide nanoneedle composite material of the above-mentioned present embodiment, comprising the steps of:

[0045] (1) Add 10 mg of graphene oxide into 20 mL of ethylene glycol solution, and disperse it uniformly by ultrasonication for 100 min to prepare a graphene oxide dispersion, wherein the concentration of the graphene oxide dispersion is 0.5 g / L.

[0046] (2) Add 0.5 g of isopropyl titanate to 5 mL of concentrated hydrochloric acid with a mass concentration of 36.5%, and add 15 mL of ultrapure water while stirring to obt...

Embodiment 3

[0051] The application of a graphene oxide / titanium dioxide nanoneedle composite material of the present invention in degrading methylene blue wastewater comprises the following steps:

[0052] Add 20 mg of the graphene oxide / titanium dioxide nanoneedle composite material prepared in Example 1 of the present invention into 50 mL of a methylene blue solution with a concentration of 20 mg / L, mix and disperse evenly, and then simulate sunlight under a 150W high-pressure xenon lamp, and take samples every 10 minutes. 1mL sample was taken out, and after centrifugation, the upper clear layer was taken to measure the absorbance at 654nm by a UV-visible spectrophotometer to determine the residual methylene blue concentration. degradation effect. A blank control was made without adding graphene oxide / titanium dioxide nanoneedle composite material.

[0053] Figure 5 It is the photocatalytic degradation effect diagram of the graphene oxide / titanium dioxide nanoneedle composite materia...

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Abstract

The invention discloses a graphene oxide / titanium dioxide nano-needle composite material and a preparation method and application thereof. The composite material uses graphene oxide as a carrier, and titanium dioxide nano-needles are supported on the surface of the graphene oxide. The preparation method includes the steps that a graphene oxide dispersion solution is prepared, a mixed solution of isopropyl titanate is prepared, and the mixed solution and the graphene oxide dispersion solution are mixed to perform thermal solvent reaction. The graphene oxide / titanium dioxide nano-needle composite material is a composite material with a new structure, has the advantages of having a stable multi-stage nano structure, strong light capture capability, high photocatalytic efficiency and the like, can be used for degradation of methylene blue wastewater, and has the very high methylene blue degradation efficiency and a good photocatalytic degradation effect, and the preparation method of the material has the advantages that the varieties of the needed raw materials are few, and being simple in operation, low in cost and the like.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to a graphene oxide / titanium dioxide nanoneedle composite material with a stable multi-level nanostructure, a preparation method and an application. Background technique [0002] Titanium dioxide is a non-toxic, high-efficiency, chemically stable and inexpensive photocatalyst, which has attracted widespread attention in the application of photocatalytic degradation of organic polluted wastewater that is difficult to degrade biochemically. Nanoscale titanium dioxide has a high degradation efficiency, but it can only perform photocatalytic reactions in the ultraviolet region, and its ability to generate electrons and the separation rate of holes need to be improved. In order to improve the photocatalytic performance of nanoscale titanium dioxide, changing its application form and preparing titanium dioxide composite materials have become the development trend of research...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J21/18C02F1/30B82Y30/00B82Y40/00C02F101/36C02F101/38
CPCB82Y30/00B82Y40/00C02F1/30B01J21/063B01J21/18C02F2101/38C02F2101/36C02F2305/10B01J35/39Y02W10/37
Inventor 胡亮赖萃曾光明陈桂秋万佳张书渠郭志黄真真何凯吴静刘微微
Owner HUNAN UNIV
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