Controllable synthesis of plate BiOBr loaded plate Bi2O2CO3 with exposed {001} facets for ciprofloxacin photo-degradation

Hydroxyl-assisted iodine ions intercalating Bi2O2CO3 nanosheets to constructure the interlayered bridge for enhanced photocatalytic activity of phenol

Promoting the charge migration and separation efficiency of Bi2O2CO3 is an appealing strategy to improve its photocatalytic performance. Herein, iodine-intercalated Bi2O2CO3 (I-Bi2O2CO3) nanosheets were prepared with the assistance of solvents...

Optimized strategies for (BiO)2CO3 and its application in the environment

Photocatalysis is a new type of technology, which has been developed rapidly for solving environmental problems such as wastewater or air pollutants in recent years. Also, the effective performance and non-secondary pollution of photocatalytic technology attract much attention from researchers. As a "sillén" phase oxide, the (BiO)₂CO₃ (BOC) is a great potential photocatalyst attributing to composed of alternate Bi₂O₂²⁺ and CO₃^2- layers, which is a benefit for transportation of electrons. Besides, BOC has attracted much attention from researchers because of its excellent characters of non-toxic, environmentally friendly, and low-cost. However, BOC has a defect on wide band gap, which is limited for the usage of visible light, so a great number of published papers focus on the modifications of BOC to improve its photocatalytic efficiency. This article mainly summarizes the modifications of BOC and its application in the environment, guiding for designing BOC-based materials with high photocatalytic activity driven by light. Moreover, the research trend and prospect of BOC photocatalyst were briefly summarized, which could lay the foundation for forming a green and efficient BOC-based photocatalytic reaction system. Importantly, this review might provide a theoretical basis and guidance for further research in this field.

Fabrication of magnetic Fe3O4@SiO2@Bi2O2CO3/rGO composite for enhancing its photocatalytic performance for organic dyes and recyclability

A novel magnetic Fe₃O₄@SiO₂@Bi₂O₂CO₃/rGO composite comprising of uniform core-shell-structured Fe₃O₄@SiO₂@Bi₂O₂CO₃ microspheres mounted on reduced graphene oxide (rGO) sheets was successfully fabricated by using a facile hydrothermal method. The adsorption-desorption isotherm of Fe₃O₄@SiO₂@Bi₂O₂CO₃/rGO belonged to type IV with an H4-type hysteresis loop. The specific surface areas and magnetization saturation value (M_s) of Fe₃O₄@SiO₂@Bi₂O₂CO₃/rGO (x = 0.15 g) were 102.12 m²/g and 25.4 emu/g, respectively. Fe₃O₄@SiO₂@Bi₂O₂CO₃/rGO (x = 0.15 g) exhibited remarkable photocatalytic degradation activity and mineralization effect for MO and decolorization performance for the mixed solution of MO, Rh B, and MB. MO degradation by Fe₃O₄@SiO₂@Bi₂O₂CO₃/rGO conformed to a first-order kinetic reaction, and the corresponding k_app value was 0.05553 min^-1. A suitable amount of rGO in Fe₃O₄@SiO₂@Bi₂O₂CO₃/rGO could decrease the energy band gap, inhibit the recombination of photo-induced electron/hole (e^-/h⁺) pair, and broaden and enhance the response of the catalyst to visible light, thereby enhancing the visible-light catalytic degradation of organic dyes. The active species produced in the photocatalysis included •O₂^-, •OH, and h⁺, with •O₂^- being the dominant active species. The as-prepared photocatalyst also showed excellent magnetic separation performance and stability. Results show that the as-prepared Fe₃O₄@SiO₂@Bi₂O₂CO₃/rGO composite is a promising photocatalyst with considerable application potential in organic dyes removal.

Refining the band structure of BiOBr nanosheets through the synergetic effect of VO43− ions replacement and oxygen vacancies for promoted visible-light-driven photocatalysis

The band structure of BiOBr nanosheets is regulated by the oxygen vacancies and VO₄³⁻ ions replacement. The BiOBr nanosheets possess defective states and a more negative conduction band potential, promoting visible-light photocatalytic activity.

Oriented construction of S-doped, exposed {001} facet BiOBr nanosheets with abundant oxygen vacancies and promoted visible-light-driven photocatalytic performance

S-doping orients the facet growth of BiOBr nanosheets from original exposed {010} plane towards {001}-dominant plane, resulting in narrower bandgap energy, higher efficient charges separation and oxygen vacancies (OVs) concentration.