Preparation method of hydrophobic aluminum oxide/silica adsorption material

The invention provides a preparation method of a hydrophobic aluminum oxide/silica adsorption material. The method is specifically carried out according to the following steps: step 1, preparing a methylation modified SiO2 sol, and preparing a stable and transparent Al2O3 sol; step 2, dropwise adding the Al2O3 sol obtained in the step 1 to the methylation modified SiO2 sol according to a molar ratio of Al:TEOS = 0-2:1 and performing stirring to obtain a hydrophobic aluminum oxide/silica adsorption sol; and step 3, drying the hydrophobic aluminum oxide/silica adsorption sol prepared in the step2 in vacuum, then performing roasting in nitrogen atmosphere, finally performing cooling to room temperature to obtain an unsupported membrane material, and grinding the unsupported membrane materialto be powders to obtain the hydrophobic aluminum oxide/silica composite adsorption material. The hydrophobic aluminum oxide/silica composite adsorption material prepared by the method is large in adsorption capacity and high