PHOTOCATALYTIC MATERIAL FOR EFFICIENT PHOTOCATALYTIC REMOVAL OF HIGH-CONCENTRATION NITRATES, PREPARATION METHOD THEREFOR, AND USE THEREOF

摘要

Disclosed are a photocatalytic material for the efficient photocatalytic removal of high-concentration nitrates, a preparation method therefor, and the use thereof. The preparation method comprises the following steps: step I, preparing citrate-stabilized silver nanoparticles; step II, synthesizing and functionally modifying SiO2; step III, preparing Ag/SiO2; and step IV, preparing an Ag/SiO2@cTiO2 core-shell structure. The photocatalytic material prepared in the present invention is high in reduction catalytic activity, and can rapidly remove the high-concentration nitrates and achieve a high nitrogen selectivity. Meanwhile, due to the protection of a titanium dioxide shell, the material has a good stability and can remove high-concentration nitrates from water due to the coexistence of high-concentration chloride ions.