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Download fileIntimate Coupling AgI/AgIO3 Heterojunction Photocatalysts with Excellent Visible-Light-Driven Photocatalytic Activity
journal contribution
posted on 27.08.2021, 15:42 authored by Chao Zeng, Haojia Ding, Linping Bao, Yujing Su, Zhipeng WangPhotodegrading toxic organic pollutants
in effluents over semiconductor
photocatalysts is friendly and promising. The key is to develop a
universally powerful and stable photocatalyst. In this work, highly
efficient AgIO3@X heterojunction photocatalysts,
composed of AgI and AgIO3 two phases, are fabricated via
a facile in situ reduction method. AgIO3 is reduced and
then AgI is generated on the surface of AgIO3, so the interfacial
interaction between AgI and AgIO3 is very intimate. Introduction
of AgI on the surface of AgIO3 extends the photoabsorption
from an ultraviolet region to a visible region and also greatly improves
charge transfer, giving rise to the remarkedly enhanced photocatalysis
activity under visible-light excitation over AgIO3@X samples relative to the pristine AgIO3. The
methyl orange (MO) photodegradation rate constant of the optimal AgIO3@20% photocatalyst reaches 0.175 min–1 under
visible-light illumination (λ > 420 nm), about 86.5-fold
enhanced
compared with the pristine counterpart, outperforming most of previously
reported state-of-the-art photocatalysts. Particularly, after 20 min
of natural sunlight irradiation with a light intensity of 13.8 mW/cm2, the AgIO3@20% sample can rapidly decompose 81.1%
of MO. The as-obtained composite photocatalysts also exhibit excellent
photocatalytic activity against rhodamine B (RhB) and 2,4-dichlorophenol
(2,4-DCP) under the illumination of visible light. The possible reaction
pathways and the MO degradation mechanism have been systematically
investigated and illustrated. The study paves a new way for designing
and developing efficient visible-light-driven photocatalysts with
an intimate interfacial interaction.
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Keywords
situ reduction methodrapidly decompose 81previously reported statepossible reaction pathwaysphotodegradation rate constantnatural sunlight irradiationfold enhanced compared420 nm ),photocatalyst reaches 0mo degradation mechanismhighly efficient agiodeveloping efficient visible3 </ subintimate interfacial interactionintimate coupling agiinterfacial interactionx </stable photocatalystvisible regionuniversally powerfulultraviolet regiontwo phasessystematically investigatedstudy pavessemiconductor photocatalystssamples relativerhodamine bpristine counterpartpristine agiooptimal agionew waymethyl orangeheterojunction photocatalystsgiving risefabricated viaexcellent visibledriven photocatalystsart photocatalysts8 mw20 min175 min