▎ 摘　　要

NOVELTY - Synthesizing halogenated bismuth oxide/graphene hydrogel comprises e.g. preparing graphene hydrogel, immersing the graphene hydrogel with cetyltrimethylammonium chloride or hexadecyl trimethyl ammonium bromide aqueous solution in a flask, dissolving bismuth(III) nitrate pentahydrate in deionized water, adding concentrated nitric acid solution for adjusting pH to 2-4, obtaining bismuth(III) nitrate pentahydrate solution, adding bismuth(III) nitrate pentahydrate solution slowly in graphene hydrogel and cetyltrimethylammonium chloride or hexadecyl trimethyl ammonium bromide mixed solution. USE - The method is useful for synthesizing halogenated bismuth oxide/graphene hydrogel (claimed). The hydrogel is useful in field of photocatalysis, photoelectrochemistry and biosensor. ADVANTAGE - The method: is simple; uses economical raw materials; and has mild conditions. The gel has high photo-generated electron-hole separation efficiency, good conductivity, and rich porous structure. DETAILED DESCRIPTION - Synthesizing halogenated bismuth oxide/graphene hydrogel comprises (i) preparing graphene hydrogel, (ii) immersing the graphene hydrogel with cetyltrimethylammonium chloride or hexadecyl trimethyl ammonium bromide aqueous solution in a flask, (iii) dissolving bismuth(III) nitrate pentahydrate in deionized water, adding concentrated nitric acid solution for adjusting the pH value to 2-4, obtaining bismuth(III) nitrate pentahydrate solution, and (iv) adding bismuth(III) nitrate pentahydrate solution slowly in graphene hydrogel and cetyltrimethylammonium chloride or hexadecyl trimethyl ammonium bromide mixed solution, boiling in oil bath at 60-120 degrees C for 3-5 hours, washing resulting product with ethanol and deionized water for 3-5 times, and freeze-drying to obtain halogenated bismuth oxide/graphene hydrogel, namely BiOX/graphene hydrogel, where X is Cl or Br.