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submitted on 17.08.2020 and posted on 18.08.2020by Jaafar Hasan, Gaowei Ouyang, Jing Wang, Haidi Li, Guangdong Tian, Chuanguang Qin
Nanosheet BiOI materials were prepared by using the precipitation-hydrothermal method.
Moreover, nanoparticle AgI/BiOI nanosheet composites were prepared using an ion-exchange
method and by controlling the amount of BiOI. The phase composition, optical morphology, and
absorption properties of the samples were determined using XRD, SEM, XPS, TEM, HRTEM,
and UV-Vis diffuse reflectance. Organic dyes, such as methyl orange (MO) and Coomassie
brilliant blue R-250 (CBB), were used to check the photocatalytic performance of the composites
when undergoing photodegradation in visible light. The prepared composites had high purity, and
the AgI nanoparticles were evenly loaded on the flower-like BiOI nanosheets, and both can absorb
the visible light. The photocatalytic activity of sole BiOI or AgI was poor, whereas that of the
composites was much better. The composite with 50% AgI exhibited the best photocatalytic
activity because of the formation of a p-n heterojunction, which promotes the separation of
photogenerated carriers and makes AgI stable under visible-light irradiation.