Method for preparing flaky aluminum oxide with high radius-thickness ratio by taking lotus root as template

Abstract

The invention discloses a method for preparing flaky aluminum oxide with a high radius-thickness ratio by taking lotus roots as a template. The method comprises the following steps: adding malonyl urea and polyaluminum chloride sol into a diluted hydrochloric acid solution to obtain a solution A; drying fresh lotus roots, cutting the lotus roots into blocks, washing the lotus roots, and immersing the lotus roots into a glucose solution for filling to obtain a lotus root precursor B; dropwise adding a melamine solution into the solution A, then dropwise adding a dilute sodium hydroxide solution until the pH value is 7.5-8.5, and adding the lotus root precursor B for soaking to obtain a mixed solution C; transferring the mixed solution C into a microwave ultrasonic hydrothermal synthesizer for reaction, and collecting to obtain a mixed solution D; pouring an upper-layer turbid solution of the mixed solution D, washing, dehydrating and drying the obtained product, and collecting to obtain a solid E; uniformly mixing the solid E, potassium aluminum fluoride and silicon dioxide in proportion, sintering, cooling, collecting a product, washing and drying to obtain the high-radius-thickness-ratio flaky aluminum oxide. The method is simple, low in cost, high in product purity and good in orientation, and the preparation efficiency of the product is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for preparing high-diameter-thick-ratio flaky alumina by using lotus root as a template. Background technique [0002] As an engineering material with superior performance and vast resource reserves, alumina and its derivatives have shown beneficial performance in catalysts, catalyst supports and adsorbents, and are irreplaceable in petroleum and automobile manufacturing. Therefore, the study of nanostructured alumina is very important. [0003] Research on alumina has been carried out since the 1930s. According to different crystal forms, alumina is mainly divided into α-Al 2 o 3 , β-Al 2 o 3 and γ-Al 2 o 3 , α-Al 2 o 3 Stable in nature and high in strength, it is usually used in structural parts, while β-Al 2 o 3 and γ-Al 2 o 3 The particularity of the morphology is widely used in the fields of catalyst supports and photoelectrocatalysis. At ...

AI Technical Summary

Problems solved by technology

At present, my country has successfully explored various preparation methods such as microemulsion method, detonation method, precipitation method, and sol-gel method. In industrial production, the preparation of large-grained alumina has been achieved, but in the preparation of micro-nano-scale alumina In terms of technology, there are still many technological gaps with the United States and Japan, which also seriously hinders the rapid development of the industry using micro-nano alumina as a fine raw material

[0004] In recent years, scientists have attempted to apply biomass materials to the preparation of micro-nano-scale alumina, and use the three-dimensional structure of biomass materials as a template to provide a growth base for alumina seed crystals, replacing the traditional methods. Highly polluting reagent raw materials have successfully controlled the size of alumina prepared in production, but most of them are currently limited to the laboratory stage and have not been further popularized and promoted in actual production

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