▎ 摘　　要

NOVELTY - Catalyst comprises a carrier, and active components supported on the carrier, where the carrier is graphene quantum dots (GQDs), and the active component is strontium titanate (SrTiO3) and nano gold. USE - The catalyst is useful for photocatalytic wastewater treatment. ADVANTAGE - The method is simple and convenient to operate; has high preparation safety; and prepares catalyst with good stability and good degradation effect on dye wastewater. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing catalyst for photocatalytic wastewater, comprises (1) the load of the active component strontium titanate on the carrier graphene quantum dot (GQDs) is the strontium titanate dispersed in the de-ionized water, then adding ethylene diamine tetraacetic acid, urea and GQDs and performing hydrothermal reaction at 120-160 degrees C, then filtering, washing, and drying to obtain the graphene quantum dot loaded with active component strontium titanate; (2) loading the active component nano-gold loaded with strontium titanate on the GQDs load of the step (1) with active component strontium titanate of GQDs dispersed in the de-ionized water, ultrasonically processing for 5 minutes, then adding mass concentration is 1% chloroauric acid (HAuCl4) solution; strongly stirring at room temperature for 10 minutes to fully mix; then gradually adding ascorbic acid with the same mol amount of chloroauric acid solution to prepare nano-gold in the mixed solution under continuous stirring; continuously stirring for 2 hours, nano-gold in-situ reduction on the GQDs surface loaded with strontium titanate, and preparing GQDs loaded with strontium titanate modified by nano-gold; and (3) activating the catalyst at 96-155 degrees C for hydrothermal reaction, and then collecting the solid phase, washing the solid phase, drying, then roasting at 400-700 degrees C to obtain the catalyst for photocatalytic wastewater treatment.