▎ 摘　　要

NOVELTY - A lanthanum cobalt/attapulgite/reduced graphene nanostructured composite material is prepared by using reduced graphene as substrate and attapulgite as framework and loading with lanthanum cobaltate. USE - Lanthanum cobalt/attapulgite/reduced graphene nanostructured composite material used as catalyst for selective catalytic reduction(SCR) denitration (claimed). ADVANTAGE - The nanostructured composite material has high nitrogen oxide conversion rate. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of lanthanum cobalt/attapulgite/reduced graphene nanostructured composite material, which involves adding lanthanum nitrate, cobalt nitrate, citric acid and attapulgite to the deionized water, stirring, transferring to a water bath to obtain wet gel, drying, calcining, grinding to obtain lanthanum cobalt/attapulgite, adding resulting lanthanum cobaltate/attapulgite to deionized water, adding acid to adjust pH to obtain positively charged aqueous solution of lanthanum cobaltate/attapulgite, ultrasonically dispersing graphite oxide in deionized water, dripping hydrazine hydrate and reducing in a water bath, washing, filtering and drying to obtain negatively charged reduced graphene, ultrasonically dispersing negatively charged reduced graphene in deionized water, adding positively charged lanthanum cobaltate/attapulgite aqueous solution, adding in water bath, stirring, drying, and grinding; and (2) usage of lanthanum cobalt/attapulgite/reduced graphene nanostructured composite material as catalyst for optical coupling-silicon-controlled rectifier denitration.