Abstract: A photocatalytic material for efficient photocatalytic removal of a high-concentration nitrate, and a preparation method and use thereof are disclosed. The preparation method includes the following steps: step 1: preparation of a citrate-stabilized silver nanoparticle; step 2: synthesis and functionalization modification of SiO2 step 3: preparation of Ag/SiO2; and step 4: preparation of an Ag/SiO2@cTiO2 core-shell structure. The photocatalytic material prepared by the present disclosure has high reduction catalytic activity and can quickly remove a high-concentration nitrate and achieve high nitrogen selectivity. In addition, due to protection of a titanium dioxide shell, the photocatalytic material has excellent stability and can remove a high-concentration nitrate in water when the nitrate coexists with a high-concentration chloride ion.

Abstract: A Fenton-like catalyst material with an electron-poor Cu center and a preparation method and use thereof are provided. The preparation method includes: step 1: dissolving bismuth nitrate pentahydrate in a nitric acid solution and diluting a resulting solution with deionized water to obtain a solution A; step 2: adding citric acid to the solution A and adjusting a pH of a resulting solution with ammonia water to obtain a solution B; step 3: dissolving aluminium isopropoxide (AIP), copper chloride dihydrate, and glucose in the solution B to obtain a suspension C; step 4: stirring the suspension C at a high temperature to allow evaporation until a solid D is completely precipitated; and step 5: subjecting the solid D to calcination in a muffle furnace to obtain the Fenton-like catalyst material. Under neutral conditions, the catalyst material exhibits a prominent removal effect for various toxic organic pollutants, especially for phenolic pollutants.