▎ 摘　　要

NOVELTY - Preparing a chitosan-titanium compound composite magnetic graphene involves (i) uniformly stirring and mixing a lithium salt powder and an acidic solvent, adding a titanium compound powder to the reaction solution and stirring under oil bath condition to obtain a dark red liquid, (ii) (a) dispersing the dark red liquid (b) adding a solvent, centrifuging and taking the supernatant, and (c) repeating the step (b) to obtain a light red liquid, (iii) adding ethanol to centrifuge to obtain a dark green supernatant containing titanium compound nanosheets, (iv) adding the dark green supernatant to a strong acid solution, ultrasonically vibrating and dispersing to obtain a green suspension, (v) adding chitosan and graphene to the green suspension, then adding a magnetic element covalent compound and stirring to obtain a mixed solution, and (vi) ultrasonically treating the mixed solution, collecting the solid product by a magnet, washing and drying. USE - Method for preparing a chitosan-titanium compound composite magnetic graphene. ADVANTAGE - The method solves the problems of poor wave absorption energy and narrow effective absorption frequency band of the existing single magnetic graphene. DETAILED DESCRIPTION - Method for preparing a chitosan-titanium compound composite magnetic graphene, involves (i) uniformly stirring and mixing a lithium salt powder and an acidic solvent to obtain a reaction solution, adding a titanium compound powder to the reaction solution under stirring conditions and stirring for 24-48 hours under the condition of oil bath at 35-40degrees Celsius to obtain a dark red liquid, where the volume ratio of the mass of the lithium salt powder to the acidic solvent is 1 g:(10-50) ml, and the mass ratio of the lithium salt powder to the titanium compound powder is 1:(1-5), (ii) (a) dispersing the dark red liquid by ultrasonic vibration for 0.5-1 hour, (b) adding a solvent, centrifuging and taking the supernatant, and (c) repeating the step (b) for 5-10 times, until the pH value of the supernatant reaches 6-6.5 to obtain a light red liquid, (iii) adding ethanol to centrifuge the light red liquid for 10-20 times to obtain a dark green supernatant containing titanium compound nanosheets, (iv) adding the dark green supernatant containing the titanium compound nanosheets to a strong acid solution, ultrasonically vibrating and dispersing for 0.5-1 hour to obtain a green suspension, where the volume ratio of the dark green supernatant containing the titanium compound nanosheets to the strong acid solution is 1: (0.1-1), (v) adding chitosan and graphene to the green suspension, and then adding a magnetic element covalent compound and stirring for 24-48 hours to obtain a mixed solution, where the mass ratio of the chitosan to the volume of the green suspension is 1 g:(50-200) ml, the mass ratio of the graphene to the volume of the green suspension is 1 g:(20-100) ml, and the mass ratio of the magnetic element covalent compound to the volume of the green suspension is 1 g:(100-500) ml, and (vi) ultrasonically treating the mixed solution for 0.5-1 hour, collecting the solid product by a magnet, washing with deionized water and drying to obtain the product.