The Preparation And Photocatalytic Activity Of Ag@AgX-intercalated Composition Materials

Photocatalysis has a potential application in the field of environmental pollutantsdegradation. K4Nb6O17is a steady and wide gap layered compound, and Ag@AgX(X=Cl,Br, I) has an obvious plasma resonance absorption in visible light region. It can not onlyimprove the K4Nb6O17visible light photocatalytic activity via interlayer intercalationmethods by introducing Ag@AgX nanoparticles into K4Nb6O17interlamination, but alsohave important meaning in resolving problems of low solar energy utilization forsemiconductor photocatalysts.The K4Nb6O17powders were synthesized via a high temperature solid phase reaction.Ag@AgX(X=Cl, Br, I) intercalated K4Nb6O17plasmonic photocatalysts (donated asK4Nb6O17/Ag@AgCl、K4Nb6O17/Ag@AgBr、K4Nb6O17/Ag@AgI) were synthesized viaa microwave-assisted ion-exchange method and photoreduction method. The compositeswere characterized by using XRD, SEM, TEM, EDX, UV-Vis, PL, XRF, XPS, et al. Thephotocatalytic performance and mechanism of the obtained composites for thedegradation of RhB were also investigated and discussed.Due to the surface plasmon resonance exhibited by Ag nanoparticles, the visiblelight absorption response of the as-prepared photocatalysts can be enhanced andbroadened to800nm. Photocatalytic experiments showed that the photocatalyticperformance for the degradation of RhB can be heavily improved by introducing theAg@AgX nanoparticles into K4Nb6O17interlamination. The K4Nb6O17/Ag@AgCl andK4Nb6O17/Ag@AgBr photocatalysts exhibited enhanced activities under visible lightirradiation, and the degradation efficiencies were up to94%and96%, respectively. TheK4Nb6O17/Ag@AgI composite had a larger BET surface area, and performed an excellentvisible light activity for the degradation of RhB, and almost83%of RhB was degradedfor40min. The recycled experiments indicated that the K4Nb6O17/Ag@AgX compositeshave a good stability after5cyclic experiments.