a mg 6 al 2 (oh) 18 4.5h 2 oNanosheets and their preparation methods and applications

A nano-sheet and nano-silica technology, applied in nanotechnology, chemical instruments and methods, aluminum compounds, etc., can solve the problems of polluting ion exchange resins, easy agglomeration, pipeline corrosion, etc., and avoid purification steps and high-speed centrifugation , good reproducibility

Active Publication Date: 2022-06-24
长治学院
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Problems solved by technology

The crystallinity of samples prepared by co-precipitation method is low, the reproducibility is poor, and the disordered growth of crystals is serious; the dependence on production equipment is relatively strong when samples are prepared by hydrothermal synthesis method, and the safety performance under high temperature and pressure needs to be considered; the crystal growth process There is a lack of in-depth research on many aspects such as controlling the influencing factors; the roasting reconstruction method consumes a lot of energy, and improper temperature control can easily lead to the destruction of the layer structure; the particle size of the sample prepared by the solid phase synthesis method is often relatively large, which cannot reach the level of nanomaterials, and Agglomeration is easy to occur; a large amount of organic solvents are used in the preparation process of the sol-gel method, and the economic cost is high, and some organic solvents have many follow-up processing steps, which are sometimes unfriendly to the environment; The cost of reagents and organic solvents is relatively high, and their recycling and reuse issues need to be considered, which is not conducive to the realization of industrialization; excessive regeneration waste liquid will be generated when preparing samples by ion exchange, and the treatment cycle is long, and the amount of salt consumption is large. Existence of the ion exchange resin will be polluted, and the discharge of a large amount of salty wastewater will easily cause pipeline corrosion
[0004] In summary, there are certain defects and deficiencies in the preparation methods of mexenite-type layered double hydroxides in the prior art, and there is an urgent need for a method that is easy to control the reaction conditions, easy to obtain raw materials, and has good reproducibility. Preparation method to prepare layered double metal hydroxides of mexenite type

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  • a mg <sub>6</sub> al <sub>2</sub> (oh) <sub>18</sub> 4.5h <sub>2</sub> oNanosheets and their preparation methods and applications
  • a mg <sub>6</sub> al <sub>2</sub> (oh) <sub>18</sub> 4.5h <sub>2</sub> oNanosheets and their preparation methods and applications
  • a mg <sub>6</sub> al <sub>2</sub> (oh) <sub>18</sub> 4.5h <sub>2</sub> oNanosheets and their preparation methods and applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] a Mg 6 Al 2 (OH) 18 ·4.5H 2 The special preparation method of O nanosheets includes the following steps:

[0035] Take 60mL, 0.30mol / LMgCl 2 and 60mL, 0.10mol / LAlCl 3 The solution was mixed evenly in equal volume, and the Mg and Al molar ratio was 3:1. The solution was placed in a 200 mL constant pressure dropping funnel, and then added dropwise to the vigorously stirred 0.50 mol / L sodium hydroxide solution. When the pH of the reaction solution was 10.8, the obtained A precipitate was washed once, re-dispersed in 30 mL of water containing 10 wt% ethylene glycol, and heat-treated at 100 °C for 4 h in a microwave hydrothermal parallel synthesizer to obtain sol material B, and then the obtained sol was The material B was transferred to a small stainless steel hydrothermal reactor lined with PTFE, and reacted at 100 °C for 16 h to obtain the sol material C, and then put the sol material C in the nano-silica microemulsion, and the pH was kept at 10, After heating at 70...

Embodiment 2

[0038] a Mg 6 Al 2 (OH) 18 ·4.5H 2 The special preparation method of O nanosheets includes the following steps:

[0039] Take 60mL, 0.30mol / L Mg(NO 3 ) 2 and 60mL, 0.10mol / LAI ((NO 3 ) 3 The solution was mixed evenly in equal volume, and the Mg and Al molar ratio was 3:1. The solution was placed in a 200 mL constant pressure dropping funnel, and then added dropwise to the vigorously stirred 0.50 mol / L potassium hydroxide solution. When the pH of the reaction solution was 11.3, the obtained A precipitate was washed once, re-dispersed in 30 mL of water containing 10 wt% ethylene glycol, and heat-treated at 120 °C for 2 h in a microwave hydrothermal parallel synthesizer to obtain sol material B, and then the obtained sol was The material B was transferred to a small stainless steel hydrothermal reactor lined with PTFE, and reacted at 120 ° C for 4 hours to obtain the sol material C, and then put the sol material C in the nano-silica microemulsion, and the pH was kept at 11...

Embodiment 3

[0042] a Mg 6 Al 2 (OH) 18 ·4.5H 2 The special preparation method of O nanosheets includes the following steps:

[0043] Take 60mL, 0.15mol / LMgCl 2 and 60mL, 0.05mol / LAlCl 3 The solution was mixed evenly in equal volume, and the Mg and Al molar ratio was 3:1. The solution was placed in a 200 mL constant pressure dropping funnel, and then added dropwise to the vigorously stirred 0.25 mol / L sodium hydroxide solution, and added dropwise all the time. When the pH of the reaction solution was 10.7, the obtained A precipitate was washed once, re-dispersed in 30 mL of water containing 10 wt% ethylene glycol, and heat-treated at 100 °C for 4 h in a microwave hydrothermal parallel synthesizer to obtain sol material B, and then the obtained sol was The material B was transferred to a small stainless steel hydrothermal reactor lined with PTFE, and reacted at 120 °C for 4 hours to obtain the sol material C, and then put the sol material C in the preparation of nano-silica microemulsi...

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Abstract

The invention relates to the technical field of preparation of inorganic materials, specifically a kind of Mg 6 al 2 (OH) 18 4.5H 2 O nanosheets and their preparation method and application. In the method, magnesium nitrate or magnesium chloride is used as a magnesium source, aluminum nitrate or aluminum chloride is used as an aluminum source, and sodium hydroxide is used as an alkaline medium. Quickly back drop into the sodium hydroxide solution, wash the obtained precipitate and redisperse it in the water containing ethylene glycol, after heat treatment in the microwave hydrothermal parallel synthesizer, then carry out the hydrothermal treatment, and then put it in the preparation of nano-dioxide Mg is obtained after heating in the microemulsion of silicon 6 al 2 (OH) 18 4.5H 2 O nanosheets. The preparation method of the present invention is special, the reaction conditions are easy to control, the raw materials are easy to obtain, and the reproducibility is good. The prepared nanosheets are thin and have good dispersibility, and are expected to be applied to the fields of flame-retardant materials such as polypropylene and other plastics.

Description

technical field [0001] The invention relates to the technical field of inorganic material preparation, in particular to a Mg 6 Al 2 (OH) 18 ·4.5H 2 O nanosheets and preparation methods and applications thereof. Background technique [0002] such as Mg 6 Al 2 (OH) 18 ·4.5H 2 Due to the special composition and structure of O-magnesite-type layered double metal hydroxides, it has acid-base functionality, memory effect, exchangeability of interlayer anions, thermal stability, and controllability of composition and structure. Wait. It can be used as a catalyst carrier; it can adsorb harmful anions that pollute the environment; it can be used as a carrier for drugs, plasmid DNA, etc. Smoke, halogen-free flame retardant. [0003] At present, the commonly used methods for preparing the layered double metal hydroxides of magnesite type include coprecipitation method, hydrothermal synthesis method, calcination reconstruction method, solid phase synthesis method, sol-gel meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K3/016C08K3/22C08K7/00C01F7/00B82Y40/00
CPCC01F7/00B82Y40/00C08K7/00C08K3/22C01P2004/24C01P2004/64
Inventor 郭福林刘志宏苗静
Owner 长治学院
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