Preparation method of nanoscale molecular sieve@ graphene oxide coupled material

A nano-molecular sieve, nano-scale technology, applied in separation methods, chemical instruments and methods, alkali metal compounds, etc., can solve the problems of high price, difficult to occupy pores, pollute the environment, etc., and achieve easy availability of reagents, short gas diffusion paths, The effect of large effective specific surface area

Inactive Publication Date: 2018-11-13
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Organic templates have the disadvantages of polluting the environment, being expensive, and occupying pores that are difficult to remove. They are not suitable for the industrial production of molecular sieves and the application of gas adsorption and separation of molecular sieves.

Method used

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  • Preparation method of nanoscale molecular sieve@ graphene oxide coupled material
  • Preparation method of nanoscale molecular sieve@ graphene oxide coupled material
  • Preparation method of nanoscale molecular sieve@ graphene oxide coupled material

Examples

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Effect test

Embodiment 1

[0020] Example 1, a preparation method of a nanoscale molecular sieve@graphene oxide coupling material mentioned in the present invention, comprising the following steps:

[0021] At room temperature, mix silica sol, sodium hydroxide and deionized water to prepare silicon source solution, the mass fraction of silica sol is 22%, and the mass fraction of sodium hydroxide is 21%; mix aluminum powder, sodium hydroxide and deionized water to prepare Aluminum source solution, the mass fraction of aluminum is 3.4%, and the mass fraction of sodium hydroxide is 32%. Place the silicon source and aluminum source solutions in a mixture of ice and water until the two solutions reach 0°C, add the aluminum source solution to the silicon source solution drop by drop, and stir for 24 hours at a speed of 800 rps. The mixed solution was centrifuged and washed to pH=8, and freeze-dried to obtain the molecular sieve amorphous precursor product. The obtained amorphous precursor was stirred and mix...

Embodiment 2

[0023] Example 2, a preparation method of a nanoscale molecular sieve@graphene oxide coupling material mentioned in the present invention, comprising the following steps:

[0024]At room temperature, mix silica sol, sodium hydroxide and deionized water to prepare silicon source solution, the mass fraction of silica sol is 66%, and the mass fraction of sodium hydroxide is 11%; mix aluminum powder, sodium hydroxide and deionized water to prepare Aluminum source solution, the mass fraction of aluminum is 3%, and the mass fraction of sodium hydroxide is 32%. Place the silicon source and aluminum source solutions in an ice-water mixture to 0°C, add the aluminum source solution to the silicon source solution dropwise, and stir for 96 hours at a speed of 700 rps. The mixed solution was centrifuged and washed to pH=8, and freeze-dried to obtain the molecular sieve amorphous precursor product. The obtained amorphous precursor and the graphene oxide suspension were stirred and mixed at...

Embodiment 3

[0025] Example 3, a preparation method of a nanoscale molecular sieve@graphene oxide coupling material mentioned in the present invention, comprising the following steps:

[0026] At room temperature, mix silica sol, sodium hydroxide and deionized water to prepare silicon source solution, the mass fraction of silica sol is 22%, and the mass fraction of sodium hydroxide is 21%; mix aluminum powder, sodium hydroxide and deionized water to prepare Aluminum source solution, the mass fraction of aluminum is 3.4%, and the mass fraction of sodium hydroxide is 32%. Place the silicon source and aluminum source solutions in an ice-water mixture, add the aluminum source solution dropwise to the silicon source solution, and stir for 24 hours at a speed of 600 rps. The mixed solution was centrifuged and washed to pH=8, and the obtained molecular sieve amorphous precursor product was freeze-dried. The obtained amorphous precursor was mixed with the graphene oxide suspension at room tempera...

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Abstract

The invention relates to a preparation method of a nanoscale molecular sieve@ graphene oxide coupled material. The technical scheme comprises the following steps: (1), sufficiently mixing nano-zeolitesilicon source and aluminum source solutions; (2), ageing, washing and drying the mixed solution at low temperature, so as to obtain molecular sieve amorphous precursor, and ensuring that the pH value is 8 after washing; (3), performing stirring, ultrasonic mixing and ageing on the molecular sieve amorphous precursor and graphene; (4), adding alkaline substance into the aged solution, and crystallizing, washing and drying a formed reaction solution, so as to obtain a product. The method has the beneficial effects that firstly, reagents adopted for reaction are available, low-in cost, green and pollution-free; secondly, molecular sieve crystal adopts nanoscale, and effective specific surface area is high; thirdly, nanoscale molecular sieve adopts a small packed structure, and a gas diffusion path is short; fourthly, the micropore utilization efficiency of the molecular sieve is improved through modes of cage expansion or cage opening; fifthly, the composite property of the material ishigher than that of other organic matter and inorganic matter.

Description

technical field [0001] The invention relates to the field of new materials, in particular to a method for preparing a nanoscale molecular sieve@graphene oxide coupling material. Background technique [0002] Molecular sieves have TO 4 An inorganic crystal material with a regular pore structure formed by tetrahedra connected by common vertices. Its characteristics are: (1) uniform pore size and fixed size; (2) large porosity and large specific surface area; (3) high thermal stability, High chemical stability. Due to the above characteristics of molecular sieves, it has been widely used in many fields such as catalysis, gas adsorption and separation, sensing, and biomedicine. Compared with traditional micron-scale molecular sieves, nanoscale molecular sieves have the advantages of smaller crystallization scale, larger specific surface area, and shorter gas diffusion path, and have more application prospects in the field of gas adsorption and separation. The main challenges ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30B01J20/28B01J20/20B01D53/22
CPCB01D53/228B01J20/20B01J20/28007
Inventor 郭海玲杨歌斯维特拉娜·拉扎罗娃赵蕾王纯正白鹏覃正兴
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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