Method of synthesizing hydroxyl stannate microcrystals by hydrothermal process

Abstract

The invention discloses a method of synthesizing hydroxyl stannate microcrystals by a hydrothermal process. The method comprises the following steps: respectively weighing 1-3mmol of analytically pure SnCl4.5H2O and 25-30mmol of analytically pure NaOH, 0.1-0.3mmol of analytically pure M<2+> metal salt and dissolving to obtain a SnCl4.5H2O liquid, a NaOH liquid and an M<2+> metal salt liquid; under the magnetic stirring condition, dropwise adding the SnCl4.5H2O liquid into the NaOH liquid to form a transparent liquid; then, dropwise adding the M<2+> metal salt liquid to form a turbid liquid; transferring the turbid liquid into a high-pressure reaction kettle with a polytetrafluoroethylene inner container, supplementing distilled water, sealing and putting the turbid liquid into an electric heating oven to react for 4-16 hours at 100-180 DEG C; and after cooling, separating, washing and drying the product. According to the method disclosed by the invention, the analytically pure SnCl4.5H2O, the analytically pure NaOH, and the analytically pure M<2+> metal salt are taken as raw materials, the hydroxyl stannate microcrystals are synthesized by the hydrothermal process and the hydroxyl stannate microcrystals are to separate and purify; the synthesized hydroxyl stannate microcrystals have a good morphological structure and regular scale; and the method is simple, green and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of stannate preparation, in particular to a method for synthesizing hydroxystannate microcrystals by a hydrothermal method. Background technique [0002] In recent years, metal stannates with perovskite structures (M[Sn(OH) 6 ], where M: Zn, Ca, Mg, Sr) has attracted attention because of its important application prospects in many fields, such as insulating ceramics, sensors, electrode materials, photocatalytic materials, etc. Hydroxystannate is a typical perovskite structure key functional material hydroxyl compound, which has excellent photocatalysis, flame retardancy and smoke suppression, gas sensing characteristics, photocatalysis and other properties, and is used in electrode and battery materials, photocatalysts, gas sensors The field of flame retardant materials has a wide range of uses and application prospects, and is one of the key functional materials to solve energy and environmental problems. ...

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Problems solved by technology

[0004] Preparation methods such as solid-phase chemical reaction method, homogeneous precipitation method, hydrothermal synthesis method and co-precipitation method have their own advantages. The main method of zinc stannate-based materials, but the products produced by the current method have shortcomings such as single appearance and serious agglomeration.

The solid-phase chemical reaction method also has disadvantages that are difficult to overcome, such as high energy consumption, high requirements for equipment and instruments, insufficient powder particles, low production efficiency, and easy mixing of impurities.

The homogeneous precipitation method will cause co-precipitation of other substances in the solution, making the precipitate stained, and it will make the crystalline precipitate into fine particles, which brings difficulties to filtration and washing; while the amorphous precipitate is very fluffy, which is difficult to filter and wash, and It is easy to absorb impurities

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