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AgI-BiOI Spherical Solid Solutions with Enhanced Visible-Light Photocatalytic Performances

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Recently, AgI and BiOI semiconductors (or their composites) have been widely investigated and demonstrated to be novel and efficient visible-light photocatalytic materials, while seldom investigations about the AgI-BiOI solid solutions with adjustable band gap and band edge have been reported. In this study, Agx(BiO)1-xI spherical solid-solution photocatalysts with controllable band structure were prepared by the combination of in situ ion-exchange route and a following low-temperature calcination process by using BiOI microspheres as the precursor. The influence of AgI amount on the microstructures and photocatalytic performance of AgI-BiOI solid solutions was discussed. It was found that the structure stability of BiOI could be greatly enhanced after the formation of AgI-BiOI solid solution, and the resultant samples show a controllable band gap in the range of 1.76-2.19 eV. Experimental results showed that the prepared Agx(BiO)1-xI solid solution exhibited a much better visible-light photocatalytic activity and stability than the pure BiOI. When the AgI amount was 1 at.%, the resultant Agx(BiO)1-xI (x = 0.01) solid solution showed the best photocatalytic activity, and its rate constant (k = 0.039 min-1) was about 3 times that of the pure BiOI even after 4 cycles of photocatalytic reaction. Considering its facile preparation from aqueous solutions, the present synthesized method of Agx(BiO)1-xI solid-solution photocatalyst can provide new insight for the development of other visible-light photocatalytic materials.
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Keywords: AgI-BiOI; photocatalysis; solid solution; visible light

Document Type: Research Article

Publication date: August 1, 2015

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  • Current Nanoscience publishes authoritative reviews and original research reports, written by experts in the field on all the most recent advances in nanoscience and nanotechnology. All aspects of the field are represented including nano- structures, synthesis, properties, assembly and devices. Applications of nanoscience in biotechnology, medicine, pharmaceuticals, physics, material science and electronics are also covered. The journal is essential to all involved in nanoscience and its applied areas.
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