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Synthesis of mesoporous Ag/ZnO nanocrystals with enhanced photocatalytic activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
53845 46987 2015 7 PDF Available
Title
Synthesis of mesoporous Ag/ZnO nanocrystals with enhanced photocatalytic activity
Abstract

•Mesoporous Ag/ZnO nanocrystals have been successfully synthesized.•The photodegradation rate was linearly increased with increase Ag contents.•Ag/ZnO nanocrystals are faster 2.2 times than undoped ZnO upon visible light.

Mesoporous Ag/ZnO nanocrystals have been successfully synthesized at different Ag contents (0–10 wt%) through a single-step sol–gel method in presence of triblock copolymer as a structure directing agent. The as-prepared hybrid materials were calcined at 450 °C in air for 4 h, subsequently, Ag nanoparticles have been photo-reduced from AgNO3 onto mesopores ZnO nanocyrstals. The XRD and Raman analysis revealed that well crystalline ZnO hexagonal wurtzite phase and face-centered cubic metallic Ag nanoparticles were formed. TEM images of mesoporous ZnO nanocrystals showed that synthesized materials composed of discrete ZnO nanoparticles agglomerated with worm-like mesoporous structure. The lattice fringes exhibit the typical distances, i.e., Ag(1 1 1) and ZnO(1 0 0) and the average Ag and ZnO nanoparticle diameters are ∼5 and 10 nm, respectively. The photocatalytic performance of different prepared photocatalysts was evaluated by degradation of methylene blue (MB) under visible light irradiation. The results indicate that the photocatalytic efficiencies of mesoporous ZnO photocatalysts were remarkably enhanced by adding 1% Ag nanoparticles which completely degrade the target MB dye within 150 min. The photodegradation rate was found to increase linearly with increasing the Ag contents from 0 to 1% and it is faster 2.2 times than undoped ZnO. From economic point of view, 1% Ag/ZnO photocatalyst contains optimum Ag content as there is no significant increase in the photocalatytic performance at higher Ag content.

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Keywords
Mesoporous; Ag/ZnO; Photocatalyst; Photocatalytic activity; Visible light
First Page Preview
Synthesis of mesoporous Ag/ZnO nanocrystals with enhanced photocatalytic activity
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 252, 1 September 2015, Pages 20–26
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis