Bismuth oxide silicate (Bi2O2SiO3) single-crystalline nanosheets with exposed {001} facets were first synthesized via a facile one-step CTAB-assisted hydrothermal method in the presence of NaOH. Controlled experiments were carried out to investigate various factors that affect the formation, morphology and exposed planes of the products systematically. The results emerged that pH and the content of CTAB play vital roles in the reaction. Bi2O2SiO3 nanosheets could not be obtained without the addition of sodium hydroxide solution in the synthesis process，and CTAB not only promotes the exposure of {001} facets, but also modulates the size and thickness of these Bi2O2SiO3 nanosheets in a wide range. It was shown that the as-prepared Bi2O2SiO3 nanosheets synthesized from the condition that the amont of CTAB was 4 mmol and the pH value was 12 possessed higher photocatalytic activities toward RhB and BPA degradation under simulated sunlight irradiation than any other samples in our experiment, which might give the main credit to the highly exposed {001} facets and considerable oxygen vacancies. The present work provides a new reference for the synthesis of B2O2SiO3 nanosheets and other manipulation of facet-dependent photoreactivity of semiconductors.

Synthesis and characterization of single-crystalline Bi2O2SiO3 nanosheets with exposed {001} facets

255th National Meeting (2018)

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