▎ 摘　　要

NOVELTY - The preparation method of concave cube shape graphene-loaded silver photocatalyst involves (i) adding graphene into mixed acid of concentrated sulfuric acid and concentrated nitric acid, filtering to obtain modified graphene, (ii) dissolving silver nitrate in ethanol to obtain silver nitrate-ethanol solution, adding modified graphene, dispersing to obtain liquid (A), (iii) dissolving sodium hydroxide in ethanol to obtain liquid (B), (iv) dripping liquid (B) to liquid (A) to obtain liquid (C), (v) adding cetyltrimethylammonium bromide and lysine to liquid (C), stirring, and reacting. USE - Preparation of concave cube shape graphene-loaded silver photocatalyst used for photocatalytic degradation of rhodamine B. ADVANTAGE - The method enables the preparation of concave cube shape graphene-loaded silver photocatalyst which has excellent photocatalytic activity, and is suitable for photocatalytic degradation of rhodamine B under UV light. DETAILED DESCRIPTION - The preparation method of concave cube shape graphene-loaded silver photocatalyst involves (i) adding graphene into mixed acid of concentrated sulfuric acid and concentrated nitric acid in a ratio of 0.5-2:1 at 85-100 degrees C, filtering for 2-8 hours, washing, drying to obtain modified graphene, (ii) dissolving silver nitrate in absolute ethanol to obtain 0.3-1 mol/l silver nitrate-ethanol solution, adding modified graphene to 0.3-1 mol/l silver nitrate-ethanol solution in a solid-liquid ratio of 1 g:20 ml-1 g: 30ml, ultrasonically dispersing for 0.5-1 hour to obtain liquid (A), (iii) dissolving sodium hydroxide in 70-75% ethanol to obtain liquid (B), where the concentration of sodium hydroxide in liquid (B) is 1.5-2 mol/l, (iv) dripping liquid (B) to liquid (A), stirring to obtain a liquid (C), where the mole ratio of sodium hydroxide in liquid (B) to silver nitrate in liquid (A) is 1-1.05:1, (v) adding cetyltrimethylammonium bromide and lysine to liquid (C), stirring uniformly, transferring to a reactor, hydrothermally reacting at 180-200 degrees C for 2-4 hours, filtering, washing, and drying.