Forward osmosis membrane based on MIL-68 (Al)/alpha-ferric oxide mixed matrix and preparation method

The invention discloses a forward osmosis membrane based on a metal organic framework compound MIL-68 (Al)/alpha-iron oxide (alpha-Fe2O3) mixed matrix and a preparation method, and belongs to the field of membrane separation. The preparation method comprises the following steps: adding 0.2%-1.0% (w/w) of MIL-68 (Al)/alpha-Fe2O3, 53.0%-82.8% (w/w) of an organic solvent, 2.0%-10.0% (w/w) of 14-dioxane or acetone, 2.0%-10.0% (w/w) of a pore-foaming agent lactic acid or polyethylene glycol, 2.0%-10.0% (w/w) of an auxiliary pore-foaming agent methanol and 11.0%-16.0% (w/w) of cellulose acetate into a three-neck round-bottom flask according to a certain sequence, stirring at 40-80 DEG C for 8-16 hours until complete dissolution, standing and defoaming for 20-24 hours to prepare a membrane casting solution; scraping on a support material to form a membrane, immersing in a constant-temperature coagulating bath at 30-50 DEG C, soaking in normal-temperature deionized water for 20-48 hours after forming, and carrying ou