https://ogma.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:41889 2B₂O₇ (CBBO) and SrBi₂B₂O₇ (SBBO) via solid-phase reaction. The crystal structure, microstructure and optical properties were investigated. The photocatalytic activities were studied by decomposition of tetracycline hydrochloride (TH) and evolution of reactive oxygen species (ROS) under UV light irradiation. The results revealed that CBBO and SBBO exhibit benign TH degradation activity with certain mineralization abilities. Within 4 min illumination, almost 70% and 58% of tetracycline hydrochloride was degraded by CBBO and SBBO, respectively. The quantitative capture experiment of radicals showed that the production rate of radical ^·OH and radical ^·O₂− was determined to be 1.27 × 10^-7 and 10.98 × 10^-7 mol·L^-1 min^-1 for CBBO and 1.01 × 10^-7 and 11.75 × 10^-7 mol·L^-1 min^-1 for SBBO, respectively. Density functional theory (DFT) calculation results demonstrated that CBBO has smaller effective masses of electrons and holes than SBBO, which results in higher charge separation efficiency and photocatalytic activity. This work provides two new layered bismuth-based borate photocatalysts for photocatalytic environmental applications.]]> Tue 16 Aug 2022 10:16:38 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:35273 xO_yI_z/g-C₃N₄, namely, g-C₃N₄/BiOI, g-C₃N₄/Bi₄O₅I₂, and g-C₃N₄/Bi₅O₇I. g-C₃N₄/BiOI is prepared by a direct precipitation method, and g-C₃N₄/Bi₄O₅I₂ and g-C₃N₄/Bi₅O₇I are obtained by in situ calcination transformation of g-C₃N₄/BiOI at different temperature. Among them, g-C₃N₄/BiOI and g-C₃N₄/Bi₄O5I₂ are type-I heterojunction, and g-C₃N₄/Bi₅O₇I belongs to type-II heterojunction. The photocatalyitc activity is surveyed by decomposition of diverse industrial contaminants, including methyl orange, bisphenol A and tetracycline hydrochloride under visible light irradiation (λ > 420 nm). It is found that g-C₃N₄/Bi₅O₇I shows largely enhanced photodegradation performance compared to g-C₃N₄/BiOI and g-C₃N₄/Bi₄O5I₂. The much higher photocatalytic activity of g-C₃N₄/Bi₅O₇I is attributed to the enhanced specific surface area, more efficient charge separation and surface transfer efficiency and increased density of charge carriers owing to the formation of type-II heterojunction. The study provides a reference for in situ fabrication of hierarchical photocatalysts with diverse heterojunction types for optimizing photocatalytic activity.]]> Thu 17 Jun 2021 12:50:03 AEST ]]>