https://nova.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39073 2/g-C₃N₄ based photocatalysts remains a major hurdle to their successful application for the remediation of water-soluble contaminants such as herbicides and heavy metals. Herein, we develop new photocatalysts based on the graft of three different cyclodextrins (α-CD, β-CD and γ-CD) on MoS₂/g-C₃N₄ composites (CDs/MoS₂/g-C₃N₄) for the removal of glyphosate and Cr (VI) from simulated agricultural runoff. CDs/MoS₂/g-C₃N₄ show remarkably enhanced photocatalytic activities for glyphosate degradation and Cr (VI) reduction compared to pristine MoS₂/g-C₃N₄. In addition, γ-CD/MoS₂/g-C₃N₄ exhibits the highest hydrophilicity and photocatalytic activity among these three different cyclodextrins grafted MoS₂/g-C₃N₄. The mechanistic investigation indicates that cyclodextrins can not only increase the accumulation of glyphosate and Cr (VI) onto the surface of CDs/MoS₂/g-C₃N₄ but also facilitate the fleet separation of photo-induced electron-hole pairs. In summary, these results collectively imply that the graft of cyclodextrins could be an effective strategy to improve the photocatalytic efficiency of MoS₂/g-C₃N₄ composites for the removal of glyphosate and Cr (VI) from simulated agricultural runoff.]]> Wed 04 May 2022 15:10:42 AEST ]]> https://nova.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://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:55779 Sat 22 Jun 2024 12:39:49 AEST ]]>