Preparation And Photocatalytic Performances Of Semiconductor Nanocomposites

In this thesis,Zn₂SnO₄ is prepared by the hydrothermal and preparation of Zn₂SnO₄/g-C₃N₄ composite semiconductor photocatalyst by grinding-roasting method.Then RhB and PNP are degradated by composed Zn₂SnO₄/g-C₃N₄ in Simulated sunlight.1.The influential factors of Zn₂SnO₄ morphology and catalytic performance are explored by using different surfactants?C₄H₄KNaO₆,CTAB,PVP?and different precipitation agents?n-butyl amine,sodium hydroxide,triethylamine,hydrazine hydrate,tetrabutyl ammonium hydroxide?.The morphology,composition and structure of the composites were determined by a series of characterizations?2.The 5 wt.%,10 wt.% and 15 wt.% Zn₂SnO₄/g-C₃N₄ composite semiconductor photocatalysts are synthesized by grinding-baking method.The morphology,composition,structure,optical absorption properties and surface physical and chemical properties of the composites are determined by a series of characterizations.3.Organic dye?RhB?and colorless dye?PNP?are degradated by the samples through the simulated sunlight.The degraded percentages of RhB are 90.52% and 67.55% using the photocatalysts g-C₃N₄ and Zn₂SnO₄ for 30 min,respectively.The degraded percentages of RhB are 91.68%,99.69 % and 90.73% using the photocatalysts Zn₂SnO₄/g-C₃N₄?Zn₂SnO₄:g-C₃N₄ = 5 wt.%,10 wt.% and 15 wt.%?for 50 min,respectively.Photocatalytic degradation of RhB by Zn₂SnO₄/g-C₃N₄ was still over 97% after four cycles of photocatalysis.The experimental results show that the photocatalytic degradation percentage of 10 wt.% Zn₂SnO₄/g-C₃N₄ is the best,and PNP can be degraded to 96.75 % after 160 min.