Mg6Al2(OH)18.4.5H2O nanosheet as well as preparation method and application thereof

A technology of nano-sheets and nano-silica, applied in nanotechnology, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as easy agglomeration, contamination of ion exchange resins, and layer structure damage, achieving good reproducibility, Avoid purification steps and effects of high-speed centrifugation

Active Publication Date: 2021-07-09
长治学院
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  • Abstract
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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

Method used

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  • Mg6Al2(OH)18.4.5H2O nanosheet as well as preparation method and application thereof
  • Mg6Al2(OH)18.4.5H2O nanosheet as well as preparation method and application thereof
  • Mg6Al2(OH)18.4.5H2O nanosheet as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

Embodiment 2

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

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

Embodiment 3

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

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

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Abstract

The invention relates to the technical field of inorganic material preparation, in particular to a Mg6Al2(OH)18.4.5H2O nanosheet and a preparation method and application thereof. The method comprises the steps: with magnesium nitrate or magnesium chloride as a magnesium source, aluminum nitrate or aluminum chloride as an aluminum source and sodium hydroxide as an alkaline medium, back-dropwisely-adding a mixed solution of the magnesium source and the aluminum source rapidly added into a sodium hydroxide solution; and washing the obtained precipitate, re-dispersing the precipitate in water containing ethylene glycol, carrying out heat treatment in a microwave hydrothermal parallel synthesizer, carrying out hydrothermal treatment, putting the product into a microemulsion for preparing nano silicon dioxide, and heating to obtain the Mg6Al2(OH)18.4.5H2O nanosheet. The preparation method is special, reaction conditions are easy to control, raw materials are easy to obtain, reproducibility is good, and the prepared nanosheet is thin and good in dispersity and is expected to be applied to the fields of flame-retardant materials of plastics such as polypropylene and the like.

Description

technical field [0001] 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 methods and applications. Background technique [0002] such as Mg 6 Al 2 (OH) 18 4.5H 2 Due to the special composition and structure of the layered double metal hydroxide of the Oxenite type, 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 absorb harmful anions that pollute the environment; it can be used as a carrier for drugs, plasmid DNA, etc. in medicine; smoke, halogen-free flame retardant. [0003] At present, the commonly used methods for preparing mezanite-type layered double hydroxides include coprecipitation method, hydrothermal synthesis method, roasting reconstruction method, solid phase synthesis method, sol-ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/00B82Y40/00C08K7/00C08K3/22
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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