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Co <sub/>3</sub> (PO <sub/>4</sub> ) <sub/>2</sub> /Ag <sub/>3</sub> PO <sub/>4</sub> with Enhanced Simulated Sunlight Photocatalytic Activity toward Ofloxacin Degradation and Mechanism Insight
摘要： BACKGROUND: Ofloxacin is a frequently detected fluoroquinolone antibiotic in wastewater treatment plants effluents, sea waters and surface waters. Photocatalytic technology is considered to the most promising treatment technology for the removal of ofloxacin. However, it is a big challenge to exploit the novel sunlight driven photocatalyst and reveal the mechanism of the ofloxacin degradation. RESULTS: Co3(PO4)2/Ag3PO4 composites were prepared using a facile hydrothermal synthesis method. The structural, morphological, optical properties of the composites were well characterized. Both the degradation efficiency and cyclical stability of the Co3(PO4)2/Ag3PO4 composites increased significantly under simulated sunlight irradiation, when ofloxacin (OFX) or methyl orange (MO) was used as the target molecule, as compared to single-phase Ag3PO4 and Co3(PO4)2. The reduction of antimicrobial activity for 8%Co3(PO4)2/Ag3PO4 reached to 88.8% after 5 min sunlight irradiation. CONCLUSIONS: Co3(PO4)2 played a critical role in suppressing carrier recombination and provided a large number of photogenerated holes and ?O2- to oxide OFX or MO. The OFX degradation mechanism included piperazinyl dealkylation, decarboxylation, defluorination. The reduction of antimicrobial activity for degradation byproducts was obvious after simulated sunlight irradiation over Co3(PO4)2/Ag3PO4. Therefore, Co3(PO4)2/Ag3PO4 is an attractive candidate for the removal of OFX.
关键词： Antibacterial activity,Mechanism,Ofloxacin,Co3(PO4)2/Ag3PO4,Simulated sunlight
更新于2025-09-23 15:22:29
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ZIF-8 derived ZnO/Zn6Al2O9/Al2O3 nanocomposite with excellent photocatalytic performance under simulated sunlight irradiation
摘要： In this contribution, ternary ZnO/Zn6Al2O9/Al2O3 nanocomposite was obtained by in situ incorporation of Al3+ during the synthesis of ZIF-8, aiming to improve the adsorption and photocatalytic performance of ZIF-8-derived ZnO under simulated sunlight irradiation. XRD, SEM, TEM, HRTEM, XPS, UV-Vis DRS, BET and PL techniques were employed for the analysis of the crystalline structure, composition, morphology, light absorption and charge separation of the samples. The photocatalytic activity of the samples was evaluated by the degradation of Methyl orange (MO) under simulated sunlight irradiation. Compared to ZIF-8-derived ZnO, the formation of ZnO/Zn6Al2O9/Al2O3 nanocomposite can provide with high BET specific surface area, reduce the band gap, inhibit the recombination of the electron-hole pairs, and hence greatly improve the photocatalytic activity. The maximum photocatalytic degradation rate of 97.5% for a high initial MO concentration of 150 mg/L-1 was obtained over ZnO/Zn6Al2O9/Al2O3 nanocomposite with molar ratio of Al/Zn as 1:1 under simulated sunlight irradiation for 60 min, which is 3.18 times higher than that of ZIF-8-derived ZnO.
关键词： Zn6Al2O9,Simulated sunlight irradiation,Al2O3,ZIF-8,ZnO,Photocatalytic degradation
更新于2025-09-19 17:15:36
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Application of a photostable silver-assisted Z-scheme NiTiO3 nanorod/g-C3N4 nanocomposite for efficient hydrogen generation
摘要： The performance and reaction mechanism of a silver (Ag)-assisted one-dimensional NiTiO3 nanorod/CN heterostructure nanocomposite (NTACN) photocatalyst for hydrogen (H2) production were explored with simulated sunlight. The physicochemical properties of the synthesized catalysts were examined using various spectrophotometers. The newly developed NTACN samples displayed an enhanced photocatalytic activity in producing hydrogen. Specifically, the H2 production rate of NTACN-5 (with a NT-to-ACN weight ratio of 5) was 3351 mmol/g-h, which was 1.42 times higher than that of ACN-4 with a Ag-to-CN ratio of 4 (2325 mmol/g-h). The effects of the Ag-to-CN and NiTiO3-to-ACN ratios on the photocatalytic activity of NTACN photocatalysts were determined. The NTACN photocatalysts exhibited a high long-term photostability under simulated sunlight irradiation. The increased photocatalyst performance and photostability were primarily ascribed to an improved charge separation efficiency due to a Z-scheme reaction mechanism as well as the assistance provided by Ag as a charge transfer shuttle and in the surface plasmon resonance effect. A photocatalytic mechanism for hydrogen generation over the NTACN photocatalysts under simulated sunlight irradiation is suggested.
关键词： Photostability,Simulated sunlight,One dimension,Z-Scheme mechanism,Charge transfer shuttle
更新于2025-09-09 09:28:46