Using a simple method to prepare UiO‐66‐NH2 /chitosan composite membranes for oil–water separation

Abstract Chitosan (CS) was used as a cross‐linking agent to modify UiO‐66‐NH2, and the modified UiO‐66‐NH2 was fixed on the mixed cellulose membrane (MCE) through vacuum filtration technology to prepare a new type of membrane. The membrane exhibited excellent hydrophilicity in the air and excellent super‐oleophobic performance underwater, and effectively separated various oil–water emulsions. When separating petroleum ether‐water emulsion, the filtration flux of the modified membrane was 2000 L m−2 h−1 higher than that of MCE, and the separation efficiency can reach more than 95%. After 10 cycles, the flux of the modified membrane was about four times of that MCE, which was 500 L m−2 h−1. Most importantly, the membrane still maintained underwater superoleophobicity in the environment of strong acid, strong base, and salt solution.