Aluminum oxide adsorbent as well as preparation method and application thereof

The invention relates to an aluminum oxide adsorbent as well as a preparation method and an application thereof. An aluminum oxide exists in an amorphous mode, has more crystal defects and provides abundant active sites, a BET method is adopted to measure that the specific area of the aluminum oxide is larger than 300 m /g, and a DFT method is adopted to measure that the average pore size of the aluminum oxide is between 1.1 nanometers and 1.8 nanometers. A material prepared through the method disclosed by the invention is an amorphous aluminum oxide, has abundant active sites and is favorable to the adsorption and removal of a pollutant; in addition, the preparation method disclosed by the invention is novel, simple in process and familiar in equipment and can be used for large-scale preparation.