Separation membrane and water treatment device including the same

A forward osmosis water treatment device comprising:

• a first housing including a feed solution receiving part configured to receive a feed solution, an osmosis draw solution receiving part configured to receive an osmosis draw solution, a separation membrane between the feed solution receiving part and the osmosis draw solution receiving part, the feed solution including a subject material to be separated therefrom, the osmosis draw solution including an osmosis draw solute, the osmosis draw solution having a higher osmotic pressure concentration than the feed solution, the separation membrane including a polymer layer, the polymer layer including a functional group having an affinity for the osmosis draw solute in the osmosis draw solution, the polymer layer of the separation membrane including a polysulfone (PS)-polyalkylene oxide (PAO) copolymer or a polysulfone (PS)-based polymer derivative including —COOH substituted in an aromatic group of a backbone of the polysulfone (PS)-based polymer derivative, the separation membrane further including a separation membrane layer stacked on the polymer layer, the separation membrane layer being permeable to water and non-permeable to the subject material to be separated, the separation membrane disposed in the first housing such that the polymer layer faces the osmosis draw solution receiving part, and the separation membrane layer faces the feed solution receiving part;
• a second housing configured to store the osmosis draw solution, to supply the osmosis draw solution to the first housing, and to recover the osmosis draw solution from the first housing;
• and
• a recovery member configured to separate and recover the osmosis draw solute of the osmosis draw solution.