Bi2MoO6 is one of the simplest members of the Aurivillius family, which is composed by [Bi2O2]2+ layers sandwiched between MoO42- slabs. It had been found that the internal electric field formed between the [Bi2O2]2+ and MoO42- layers in Bi2MoO6 could effectively separate photogenerated charge carriers, while the hybridization between its O 2p and Bi 6s states could narrow its band gap to enable the absorption of visible light. Thus, it had drawn research attentions as an efficient visible-light-activated photocatalyst for various applications. In this talk, two material modulation strategies will be presented for the photocatalytic performance enhancement of Bi2MoO6 under visible light illumination. Theoretical calculation based on density function theory (DFT) discovered that the internal polarization in Bi2MoO6 could be increased by shortening its crystal lattice parameter b. Subsequently, a simple, one-pot template-free solvent-thermal process was developed for the synthesis of Bi2MoO6 photocatalyst, and the addition of NaOH in the reaction solution was found to be effective to shorten its crystal lattice parameter b. With shortened crystal lattice parameter b, the Bi2MoO6 photocatalyst demonstrated improved photogenerated charge carrier separation efficiency due to its increased internal polarization, and subsequently possessed a largely enhanced photocatalytic performance as demonstrated in its photocatalytic degradation of organic pollutants and disinfection of staphylococcus aureus bacteria under visible light illumination. Next, rich oxygen vacancies were introduced in Bi2MoO6 nanosheets through a post-synthesis etching treatment by NaOH aqueous solution at room temperature. Without changing their crystal structure, morphology, optical properties, and energy band structures, a series of Bi2MoO6 nanosheet samples with different oxygen vacancy concentrations were synthesized to provide a model photocatalyst to examine the charge carrier separation role of oxygen vacancies on its photocatalytic performance without interferences from other factors. Bi2MoO6 nanosheets with rich oxygen vacancies demonstrated an improved separation efficiency on photogenerated electron-hole pairs due to the existence of oxygen vacancies, and subsequently they demonstrated largely enhanced photocatalytic activities as demonstrated by their effective sulfamethoxazole degradation and Escherichia coli bacteria disinfection under visible light illumination.

Modulations of Bi2MoO6 for photocatalytic performance enhancement under visible light illumination

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.