▎ 摘　　要

NOVELTY - Zinc hydroxystannate (ZnSn(OH)6) cubic nanoparticles/graphene sandwich composite photocatalyst is prepared by subjecting graphene oxide and zinc hydroxystannate cubic nanoparticles into UV light secondary reduction. USE - Zinc hydroxystannate cubic nanoparticles/graphene sandwich composite photocatalyst used for optical degradation treatment (claimed). ADVANTAGE - The composite photocatalyst has simple preparation, convenient operation, environment friendly, high efficiency, and low cost. It effectively improves photo-carrier separation, reduces carrier recombination rate, and achieves superior photocatalytic properties than nanoparticles. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) preparation of ZnSn(OH)6 cubic nanoparticles/graphene sandwich composite photocatalyst by (a) preparing ZnSn(OH)6 cubic nanoparticles by dissolving zinc acetate in deionized water at room temperature; adding equal amount of tin oxide in zinc acetate solution; uniformly stirring; transferring mixture into PTFE reaction kettle; heating at 120-200 degrees C for 12-24 hours; and cooling to obtain ZnSn(OH)6 cubic nanoparticles; (b) preparing graphene oxide sol by taking natural graphite powder as raw material; preparing into improved Hummers graphene oxide; and dispersing graphene oxide in deionized water to form graphene oxide sol; (c) preparing ZnSn(OH)6 cubic nanoparticles/graphene sandwich composite material by dispersing ZnSn(OH)6 cubic nanoparticles in ultrasonic weak acid solution; dropping graphene oxide sol; ultrasonically dispersing for 5-30 minutes; further stirring for 2 hours; centrifuging and separating particles; washing with deionized water; vacuum drying to obtain ZnSn(OH)6/graphene oxide composite material; and (d) preparing ZnSn(OH)6 cubic nanoparticles/graphene sandwich composite photocatalyst by dispersing ZnSn(OH)6/graphene oxide composite material in anhydrous ethanol; discharging oxygen in solution using inert gas; irradiating solution with UV light for 10-300 minutes under protection of inert atmosphere; centrifuging; washing particulates; and drying to obtain ZnSn(OH)6 cubic nanoparticles/graphene sandwich composite photocatalyst; and (2) application of ZnSn(OH)6 cubic nanoparticles/graphene sandwich composite photocatalyst for optical degradation treatment by adding 0.10-1.0 mg/ml ZnSn(OH)6 cubic nanoparticles/graphene sandwich composite photocatalyst into 1-100 mg/l methyl orange solution.