Method for preparing self-assembled hollow alumina microspheres by taking sesbania gum as template

Abstract

The invention discloses a method for preparing self-assembled hollow alumina microspheres by taking sesbania gum as a template. The method comprises the following steps: 1, adding aluminum sulfate octadecahydrate, dicyandiamide and methyl pyrrolidone into deionized water, and carrying out ultrasonic dispersion to obtain a clear solution A; 2, gradually dropwise adding a sesbania gum solution into the solution A, adjusting the pH value to 8.2-9.2, and performing magnetic stirring to obtain a solution B; 3, transferring the solution B into a rotary micro-polymerization reactor for micro-polymerization reaction, and collecting a product to obtain a solid C; 4, washing the solid C for multiple times, performing vacuum freeze drying, and performing collecting to obtain a white powdery solid D; 5, mixing the solid D with potassium aluminum fluoride, transferring the mixture into a muffle furnace, preserving heat, and performing cooling, washing and drying to obtain the self-assembled hollow aluminum oxide microspheres. A micro-nano spherical space structure naturally formed in the sesbania gum is used as a growth template of alumina seed crystals, the obtained alumina crystal grains are good in orientation and uniform, the production and manufacturing cost is lower, and the production process is simple.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a method for preparing self-assembled hollow aluminum oxide microspheres by using squash gum as a template. Background technique [0002] Since the 1930s, alumina raw materials have gradually shined in the field of construction and construction machinery components due to their low price and good mechanical properties, and have become an important experimental raw material. Alumina is mainly divided into three types according to different crystal forms: α-Al 2 o 3 , β-Al 2 o 3 and γ-Al 2 o 3 , where α-Al 2 o 3 The properties are stable, the strength of the particles is high, and it is usually used in the structural parts of aircraft, while β-Al 2 o 3 and γ-Al 2 o 3 Due to the particularity of the morphology, it is widely used in the fields of catalyst carrier and photoelectrocatalysis. Su Qiaoqiao, Chen Xiaojun, Zhou Long. Preparation of nanometer α-Al by chemical...

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Problems solved by technology

[0004] In order to prepare micro-nano-scale alumina with controllable morphology, scientific researchers have gradually explored production methods such as microemulsion method and sol-gel method for decades. However, the above production methods mostly use toxic organic reagents as templates. The growth specificity of the alumina produced is limited, it is difficult to realize the preparation of alumina with a specific structure, and it is difficult to achieve further large-scale promotion in actual production and life.

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