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

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...

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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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