▎ 摘　　要

NOVELTY - Preparing graphene oxide (GO)/polyvinylidene difluoride (PVDF) molecular imprinting composite film comprises e.g. (i) preparing graphene oxide, (ii) preparing GO/PVDF blend by dispersing GO in dimethylformamide, ultrasonic dissolving PVDF powder in GO/DMF mixed solution to obtain casting uniform solution, solidifying and storing, and (iii) dipping GO/PVDF blend prepared in boric acid solution, immersing in boric acid, again immersing in ammonium hexafluorotitanate and boric acid to obtain titanium dioxide-GO/PVDF film, washing film and post processing. USE - The method is useful for preparing GO/PVDF molecular imprinting composite film. ADVANTAGE - The composite film: has simple preparation method, easy implementation, high yield, mild reaction condition excellent separating performance of norfloxacin and selectivity according to static adsorption and selective permeation experiment result; and is suitable for industrial production. DETAILED DESCRIPTION - Preparing GO/PVDF molecular imprinting composite film comprises (i) preparing graphene oxide, (ii) preparing GO/PVDF blend by ultrasonic dispersing GO in dimethylformamide, then dissolving PVDF powder in GO/DMF mixed solution to obtain casting uniform solution, sealing casting solution, mechanical stirring at certain temperature for certain time, allowing to stand and removing bubble, pouring casting solution on a glass plate and then scrapping casting on coated glass plate, immersing the glass plate in deionized water by phase conversion, solidifying and storing in deionized water, (iii) dipping prepared GO/PVDF blend in H3BO3 solution at room temperature for period of time, taking out GO/PVDF blend, immersing in boric acid for a period of time, removing GO/PVDF blend, immersing in a mixed solution (A) composed of ammonium hexafluorotitanate and boric acid (having pH value of 3.86) for a period of time to obtain titanium dioxide-GO/PVDF film, washing film using deionized water to obtain un-modified titanium dioxide nano particles, and drying under vacuum at 30 degrees C, and (iv) dispersing KH570 in mixed solution (B) composed of ethanol and deionized water, adding titanium dioxide-GO/PVDF film at certain temperature under magnetic stirring for certain time to obtain KH570-titanium dioxide-GO/PVDF film, washing using ethanol and deionized water, and drying at certain temperature, then adding norfloxacin, ethylene glycol dimethylacrylate (EGDMA), dissolving acrylamide (AM) in deionized water, adding KH570-TiO2 GO/PVDF film, passing nitrogen gas for period of first time, then adding azobisisobutyronitrile (AIBN), again passing nitrogen gas for a period of second time, carrying out copolymerization reaction for period of time, then continuously reacting for a period of time to obtain GO/PVDF molecularly imprinted composite film, washing using ethanol and deionized water to remove unpolymerized AM and EGDMA, and washing using mixed solution of methanol/acetic acid until ultraviolet spectrum does not detects norfloxacin at 287 nm, then washing by methanol and acetic acid, drying and storing. An INDEPENDENT CLAIM is also included for GO/PVDF molecular imprinting composite film is prepared by above mentioned method.