Vermiculite nanosheet and preparation method thereof

A nanosheet and vermiculite technology, applied in the field of nanomaterials, can solve the problems of limiting the application scope of vermiculite mineral resources, unfavorable promotion and use, and large environmental pollution, achieving strong universality in equipment selection and control, and facilitating industrial production. , the effect of overcoming tumor hypoxia

Pending Publication Date: 2021-12-24
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the preparation process, organic additives are used, or the equipment and process are complicated, or the yield is low, and most of them are in the laboratory stage, and the waste liquid generated is difficult to handle, causing great environmental pollution.
At the same time, the obtained vermiculite flakes or composite products are only suitable for specific fields, which is not conducive to popularization and use, and limits the application range of vermiculite mineral resources
No unmodified or single independent vermiculite nanosheet product has been prepared, and there is no technical scheme and method related to the preparation of the vermiculite nanosheet

Method used

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  • Vermiculite nanosheet and preparation method thereof
  • Vermiculite nanosheet and preparation method thereof
  • Vermiculite nanosheet and preparation method thereof

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preparation example Construction

[0032] The invention provides a preparation method of vermiculite nanosheets, comprising adding vermiculite to an alkali metal salt solution modifier for intercalation treatment, and exfoliating to obtain vermiculite nanosheets, wherein the addition of vermiculite per milligram is 0.1 - 10 moles per liter of alkali metal salt modifier. In every milligram of vermiculite, if the concentration of the added alkali metal salt modifier is lower than 0.1 mole per liter, the thickness of the prepared vermiculite sheet will be thickened; if the concentration of the alkali metal modifier is higher than 10 moles per liter, longer wash times are required to remove the alkali metal modifier.

[0033] Further, it specifically includes the following steps:

[0034] S1: adding vermiculite to the alkali metal salt solution modifier to expand the vermiculite;

[0035] S2: separate after expansion, and collect the upper layer of colloidal slurry;

[0036] S3: Ultrasonic treatment is performed...

Embodiment 1

[0044] A preparation method of vermiculite nanosheets, comprising the following steps:

[0045] S1: Add 50 mg of commercial vermiculite powder to 5 moles per liter of lithium chloride solution, heat at 80°C under reflux for 24 hours, and intercalate the vermiculite powder to make it expand;

[0046] S2: After the expansion is completed, centrifuge at a speed of 3000rpm for 20 minutes to collect the upper colloidal slurry;

[0047] S3: Ultrasonic treatment is performed on the upper colloidal slurry for 0.5 hours several times, and the vermiculite nanosheets are obtained by exfoliation.

[0048] The thickness of the vermiculite nanosheets prepared by the above method is 1.1 nm, the width of the vermiculite nanosheets is 320 nm, and the length is 320 nm.

[0049] figure 1 Shown is the external form of massive vermiculite, figure 2 Scanning electron microscope image of bulk vermiculite, image 3 For the solution of the vermiculite nanosheet provided in this embodiment, Figure...

Embodiment 2

[0054] A preparation method of vermiculite nanosheets, comprising the following steps:

[0055] S1: Add 50 mg of commercial vermiculite powder to 100 moles per liter of lithium EDTA solution, heat at 90°C for 30 hours under reflux, and intercalate the vermiculite powder to make it expand;

[0056] S2: After the expansion is completed, centrifuge at a speed of 2500rpm for 25 minutes to collect the upper colloidal slurry;

[0057] S3: The upper colloidal slurry was subjected to multiple ultrasonic treatments for 0.3 hours, and the vermiculite nanosheets were peeled off.

[0058] The thickness of the vermiculite nanosheets prepared by the above method is 1.0 nm, the width of the vermiculite nanosheets is 300 nm, and the length is 310 nm.

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Abstract

The invention provides a vermiculite nanosheet and a preparation method thereof. The preparation method comprises the steps: adding vermiculite into an alkali metal salt solution modifier, carrying out intercalation treatment, and stripping to obtain the vermiculite nanosheets, wherein the alkali metal salt modifier with the concentration of 0.1-10 mol / L is added into each milligram of vermiculite. The vermiculite nanosheet provided by the invention not only can be used as a nano reinforcing material in industries such as papermaking, coating, paint, plastic, rubber and the like, but also can be used as an oxygen self-supply platform to generate oxygen and various active oxygen, and is effectively used for preparing biomedical photodynamic therapy medicines, overcoming tumor hypoxia and enhancing the effect of photodynamic therapy. The preparation method of the vermiculite nanosheet provided by the invention is simple in process, green and environment-friendly, and convenient for industrial application.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a vermiculite nanosheet and a preparation method thereof. Background technique [0002] Two-dimensional nanomaterials and vermiculite have attracted extensive attention due to their physicochemical properties. Vermiculite is a sheet-like naturally layered clay consisting of octahedral layers of magnesium oxide and iron oxide sandwiched between two identical tetrahedral layers of aluminum oxide and silicon dioxide. Vermiculite has the advantages of good crystallization, stable properties, easy sorting, and abundant resources. In addition, it also has excellent properties such as heat preservation, light weight, antifreeze, and antibacterial. At the same time, vermiculite also has the following functions: Fe 3+ Catalyzes the tumor microenvironment (i.e. consumes glutathione to generate oxygen), Fe 2+ The hydrogen peroxide ion is generated by the reaction of phe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/40B82Y40/00
CPCC01B33/40B82Y40/00C01P2004/64C01P2004/62C01P2004/24
Inventor 张鹏飞于兴华蔡林涛
Owner SHENZHEN INST OF ADVANCED TECH
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