Preparation method of high-crystallinity Fe-based hydrotalcite-like compound

Abstract

The invention relates to a preparation method of a Fe-based hydrotalcite-like compound, and the preparation method is as follows: first preparing a divalent metal M salt and trivalent Fe salt mixed solution, adding urea to the mixed solution, stirring until the salts are dissolved, and then reacting at 80-120 DEG C in a closed environment for 24 to 96 hours to obtain the Fe-based hydrotalcite-like compound; wherein metal M is selected from the group consisting of Ni, Mg or Co. According to the preparation method, the characteristic of uniform interior pH of the solution of an urea method, the high-crystallinity uniform-size hydrotalcite-like compound can be prepared, the preparation process of the Fe-based hydrotalcite-like compound can be simplified, the ratio of divalent and trivalent metallic element can be controllably adjusted in a certain range. The preparation method of the invention is one-step in reaction, low in cost, simple in operation, mild in reaction conditions, and in favor of further preparation of the Fe-based hydrotalcite-like compound into a thin film and a device.

Description

technical field [0001] The invention relates to the field of inorganic materials, in particular to a method for preparing iron-based hydrotalcites with high crystallinity by a urea method. Background technique [0002] Anionic layered inorganic functional materials are also called hydrotalcite-like (LDHs), the element composition of the main layer, and the type and quantity of the guest anion between the layers are all adjustable. These characteristics make LDHs have a variety of excellent physical and chemical properties, showing extremely broad application prospects in the fields of catalysis, adsorption, separation, ceramic material precursors, photoelectric and photochemical reaction media, and biological nanomaterials. The introduction of nickel and ferromagnetic transition metal elements at the same time greatly facilitates the expansion of its application range in the fields of light, electricity, and magnetism. As an important index parameter, the particle size dist...

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Problems solved by technology

This may be due to the different pH values ​​required for co-precipitation of different metal ions in the solution. For iron-based hydrotalcites, the alkali source provided by urea decomposition under normal pressure cannot effectively meet the requirements for the co-precipitation of metal ions. Reaction conditions required for precipitation

Although Huang Yan et al. synthesized magnesium-iron-based anionic layered materials by urea decomposition method, sodium hydroxide needs to be added as an auxiliary alkali source during the preparation process, which complicates the reaction process and limits the in-situ reaction. , and only iron is the magnetic element in the main laminate elements, the application range of the synthetic product magnesium iron carbonate LDH is much smaller than that of the binary magnetic nickel iron carbonate LDH

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