▎ 摘　　要

NOVELTY - Method for preparing graphene-supported cobalt-doped titanium dioxide photocatalyst, involves (a) mixing tetra-n-butyl titanate, glacial acetic acid and absolute ethanol, adding cobalt nitrate and stirring to obtain titanium oxide precursor, (b) adding polyvinylpyrrolidone and absolute ethanol, adding polyvinylpyrrolidone, stirring, adding the precursor, stirring and leaving still to obtain a uniform and stable orange-yellow polyvinylpyrrolidone/cobalt-titanium dioxide spinning solution, (c) pouring the spinning solution into a syringe and electrospinning to obtain a polyvinylpyrrolidone/cobalt-titanium dioxide composite fiber on the negative iron sheet, (d) calcining the fibers, naturally cooling and grinding to obtain cobalt-titanium dioxide nanofibers, and (e) adding the nanofibers to graphene hydrogel, evenly stirring and vacuum freeze-drying to obtain cobalt-titanium dioxide/reduced graphene oxide aerogel, which is the finished product. USE - The method is useful for preparing graphene-supported cobalt-doped titanium dioxide photocatalyst for volatile organic compounds treatment applications. ADVANTAGE - The method is simple to operate and reduces production cost. The photocatalyst has controllable morphology, high specific surface area, excellent optical performance and photocatalytic degradation of organic pollutants, and is environmentally-friendly. DETAILED DESCRIPTION - Method for preparing graphene-supported cobalt-doped titanium dioxide photocatalyst, involves (a) mixing tetra-n-butyl titanate, glacial acetic acid and absolute ethanol, adding cobalt nitrate in a cobalt/titanium molar ratio of 0.005-0.02 and stirring at room temperature to obtain titanium oxide precursor, (b) adding polyvinylpyrrolidone and absolute ethanol in a mass ratio of 1:4-1:6, measuring the absolute ethanol, adding polyvinylpyrrolidone to adjust the solution to a certain viscosity while stirring, continuously stirring for 0.5-1 hour until bubbles are eliminated, adding the precursor, stirring for 2-4 hours and leaving still to obtain a uniform and stable orange-yellow polyvinylpyrrolidone/cobalt-titanium dioxide spinning solution, (c) pouring the spinning solution into a syringe, selecting the stainless steel needle, inverting the syringe to discharge the air bubbles in the tube, using the electrospinning device for electrospinning, connecting the positive electrode to the needle, and the negative electrode to the iron sheet and adjusting the curing distance, voltage and set related parameters to obtain a polyvinylpyrrolidone/cobalt-titanium dioxide composite fiber on the negative iron sheet, (d) calcining the composite fibers in a muffle furnace at 500-800 degrees C for 4-5 hours, naturally cooling to room temperature, removing the sample and grinding to obtain cobalt-titanium dioxide nanofibers, and (e) adding nanofibers to graphene hydrogel, evenly stirring and vacuum freeze-drying to obtain cobalt-titanium dioxide/reduced graphene oxide aerogel, which is the finished product.