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Preparation method of graphene oxide/organic hollow silicon dioxide nano composite material

A technology of hollow silica and nanocomposite materials, applied in the direction of silica, silica, chemical instruments and methods, etc., to prevent agglomeration, solve separation difficulties, and increase adsorption capacity

Active Publication Date: 2020-04-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the synthesis of graphene oxide and silica composites, only silanol groups present on the surface of inorganic silica are not enough for practical applications, and most of them are solid silica without any hollow or mesoporous structure. Therefore, the preparation of silica with organic groups and special structure can improve the performance of the composite to meet the needs of practical applications, especially in the application of adsorption

Method used

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  • Preparation method of graphene oxide/organic hollow silicon dioxide nano composite material
  • Preparation method of graphene oxide/organic hollow silicon dioxide nano composite material
  • Preparation method of graphene oxide/organic hollow silicon dioxide nano composite material

Examples

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preparation example Construction

[0091] Referring to accompanying drawing 1 can know: the preparation method of graphene oxide / organic hollow silicon dioxide nanocomposite material, comprises the steps,

[0092] Step 1: preparing graphene oxide;

[0093] Step 2: preparing organic hollow silica;

[0094] The organosilane composition with core-shell structure is prepared by using organosilanes with weaker alkali resistance and organosilanes with stronger alkali resistance (the alkali resistance of the organosilane with stronger alkali resistance is weaker than that with respect to alkali resistance) For organic silanes, that is, the alkali resistance of organic silanes with strong alkali resistance is greater than that of organic silanes with weak alkali resistance), and NaOH solution is used to etch organic silanes with weak alkali resistance to obtain strong alkali resistance organic hollow silica;

[0095] Step 3: preparing graphene oxide / organic hollow silica nanocomposites;

[0096] The organic hollow s...

Embodiment 1

[0136] The product prepared in this example is GO / NCS-HSNs;

[0137] The specific steps for preparing NCS-HSNs are as follows:

[0138] Step 1: preparing graphene oxide;

[0139] Add graphite powder and sodium nitrate into the three-necked flask, the amount of the two is 6g and 3g respectively, and further add 150mL concentrated sulfuric acid into the above mixing system, and control the temperature of the system below 5°C; after reacting for 2 hours in this state, the 24g of potassium permanganate was added to the above system in 6 times within 1 hour with 4g each time, and the temperature of the system was maintained not to exceed 10°C through an ice-water bath; then after mechanical stirring for 1 hour, the ice-water bath was changed to a warm water bath, and Maintain the temperature of the system at about 35°C, and stir mechanically for 2 hours; then slowly add 270mL deionized water into the above system for rapid stirring, and control the system temperature not to exceed...

Embodiment 2

[0147] The product prepared in this example is GO / HS-HSNs;

[0148] Its preparation method is the same as in Example 1; the difference is that the product prepared in this example is graphene oxide / mercapto-functionalized hollow silica nanocomposites (GO / HS-HSNs); the organic hollow silica prepared by it Silicon is thiocyano functionalized hollow silica.

[0149] Conclusion: The GO / HS-HSNs prepared by this example has excellent adsorption performance; the operation is simple and environmentally friendly.

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Abstract

The invention discloses a preparation method of a graphene oxide / organic hollow silicon dioxide nano composite material. The preparation method comprises the following steps: step 1, preparing graphene oxide; step 2, preparing organic hollow silicon dioxide: preparing an organic silane composition with a core-shell structure by adopting organic silane with relatively weak alkali resistance and organic silane with relatively strong alkali resistance, and etching the composition by a NaOH solution to obtain organic hollow silicon dioxide; and step 3, preparing the graphene oxide / organic hollow silicon dioxide nano composite material: enabling the organic hollow silicon dioxide to be positively charged, and combining the organic hollow silicon dioxide with negatively charged graphene oxide toobtain the graphene oxide / organic hollow silicon dioxide nano composite material. The composite material has the advantage of excellent adsorption performance.

Description

technical field [0001] The invention relates to the field of nanocomposite materials, more specifically, it relates to a preparation method of graphene oxide / organic hollow silica nanocomposite materials. Background technique [0002] Since 2004, Geim et al. used the mechanical exfoliation method to obtain stable graphene, because of its excellent electrical properties, excellent thermal conductivity, large specific surface area, high Young's modulus and fracture strength, graphene has been attracting attention. of great interest to researchers. [0003] As a derivative of graphene, graphene oxide not only has the large specific surface area of ​​graphene, excellent thermal conductivity and excellent mechanical properties, but also contains a large number of oxygen-containing groups after deep oxidation. These oxygen-containing groups not only Providing graphene oxide with a large number of active sites also makes graphene oxide have good hydrophilic properties and is easil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/198C01B33/18B01J20/10B01J20/20B82Y30/00B82Y40/00
CPCC01B32/198C01B33/18B01J20/103B01J20/20B82Y30/00B82Y40/00C01P2004/03C01P2004/04C01P2002/85C01P2006/12C01P2006/17C01P2004/64C01P2004/62C01P2004/61
Inventor 陈连喜方金金吕博
Owner WUHAN UNIV OF TECH