Hydrophilic modification of polypropylene membrane via tannic and titanium complexation for high‐efficiency oil/water emulsion separation driven by self‐gravity

Abstract Membrane separation technology has played an enormous role in water treatment. However, the surface of the separation membrane has low wettability, and it is easy to cohere with oil droplets during the oil–water separation process, which affects the efficiency of water treatment. To improve its separation property, this article reports the continuous deposition of tannic acid (TA)‐titanium (Ti IV ) complex interconnected networks with high adhesion and long‐term stability on the surface of polypropylene (PP) membranes to achieve oil–water separation. The hydrophilic TA‐Ti nanostructured coating shows high adhesion and long‐term stability on non‐polar surfaces of the PP membrane. Notably, after modification, the membrane can be used to separate hexadecane‐in‐water emulsions under gravity force, with a separation efficiency of over 99% and a water flux of 227 Lm −2 h −1 . Compared with some membranes modified with polyphenols, this easy‐to‐prepare TA‐Ti@PP membrane can achieve better separation performance with only gravity actuation. Furthermore, the modified membrane has superior reusability and excellent chemical stability (salt/acid/alkali resistance), and it has great potential in the field of oil‐in‐water and wastewater treatment.

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