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Synthesis of BiVO4/WO3 composite film for highly efficient visible light induced photoelectrocatalytic oxidation of norfloxacin
摘要： In this study, we synthesized BiVO4/WO3 composite film via a hydrothermal method and successive ionic layer adsorption and reaction (SILAR) for photoelectrocatalytic (PEC) degradation of norfloxacin (NOR) under visible light irradiation (λ > 420 nm). The BiVO4/WO3 composite film was characterized by various techniques in details. These results suggested that BiVO4 was successfully assembled onto the WO3 film surface. The BiVO4/WO3 composite film exhibited enhanced PEC performance and the apparent rate constant for degradation of NOR was estimated to be 2.68 × 10-3 min-1, which was 3.52 and 2.39 times higher than that of WO3 and BiVO4 film, respectively. The superior PEC performance could be ascribed to the formation of n-n junction facilitating the interfacial charge transfer and separation rate, resulting in the enhanced light-harvesting capability. The generated h+, ?O2- and ?OH radicals were responsible for the PEC degradation of NOR confirmed by the radicals trapping experiments and ESR spin-trap technique. Analysis of the degradation intermediates implied that the piperazine ring of the norfloxacin was mainly attacked during the visible-light-driven degradation process.
关键词： SILAR,photoelectrocatalytic oxidation,BiVO4/WO3 composite film,norfloxacin
更新于2025-09-19 17:15:36
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P‐9.9: Research on The New Display Technology ‐ Inkjet‐Printed Quantum Dot Display with Blue OLEDs
摘要： Direct discharge of aquaculture wastewater in coastal areas could increase concentrations of antibiotics in coastal mangrove forests. This study focused on the Gaoqiao Mangrove Nature Reserve in Zhanjiang City, Guangdong Province. Norfloxacin (NOR) residues in rhizosphere sediments, plant roots, branches, and leaves of two dominant mangrove communities, Rhizophora stylosa and Avicennia marina, the correlation between physical properties of rhizosphere deposition and residual NOR in sediments, and NOR accumulation in the root system were analyzed. Significant differences were noted in NOR residues in rhizosphere sediments of R. stylosa and A. marina, with higher NOR concentrations than those in other wetland sediments locally and abroad. NOR accumulation in R. stylosa was higher in the branches than in the roots and was also significantly higher than that in A. marina. Thus, both species could accumulate NOR from the environment with R. stylosa showing a stronger potential to purify the environment. Cation exchange capacity and total organic carbon could affect NOR distribution in the rhizosphere sediment, and total organic carbon content could reduce NOR uptake by mangrove roots. This study contributes to research on the migration and adsorption characteristics of antibiotics in mangrove wetlands.
关键词： mangrove ecosystems,migration characteristics,aquaculture wastewater,norfloxacin,residual characteristics
更新于2025-09-19 17:13:59
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Optically-controlled supramolecular self-assembly of an antibiotic for antibacterial regulation
摘要： We report a supramolecular photo-responsive antibiotic (azobenzene-norfloxacin/aCD). This supramolecule exhibited a higher ‘‘on–off’’ ratio of antibacterial ability than azobenzene-norfloxacin alone under UV irradiation. It offers an approach to efficiently regulate the activity of antibiotics by combining the supramolecular and light-regulating strategies together.
关键词： photo-responsive,antibiotic,antibacterial regulation,supramolecular,azobenzene-norfloxacin
更新于2025-09-12 10:27:22
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Paper-Based Fluorescent Immunoassay for Highly Sensitive and Selective Detection of Norfloxacin in Milk at Picogram Level
摘要： Norfloxacin (NOR) in milk may influence mammalian cell replication and bring about a decrease in the efficiency for treating infection in humans. However, current techniques for detecting NOR usually require expensive instruments and trained personnel. In this work, we have developed a low-cost and simple method via paper-based fluorescent immunoassay for highly sensitive and selective detection of NOR in milk at picogram level. The NOR monoclonal antibody labeled with quantum dots is used as a detection probe to recognize the corresponding NOR, which can quantitatively detect NOR on paper-based devices. The detection limits in aqueous solution and milk are 1 pg/mL and 10 pg/mL, respectively. The developed paper-based method provides a cheap, sensitive, eco-friendly, and rapid approach for quantitative detection of trace NOR in milk, which may find wide applications in food safety inspection. Noteworthy, the method is especially suitable for applications at resource-limited and on-site settings.
关键词： Fluorescent immunoassay,Paper-based devices,Quantum dots,Norfloxacin,Milk
更新于2025-09-09 09:28:46
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Novel photocatalytic system Fe-complex/TiO2 for efficient degradation of phenol and norfloxacin in water
摘要： Photocatalysis is one of the effective strategies to eliminate various organic pollutants in water body. In this paper we have prepared a series of new composite photocatalysts to degrade phenol and norfloxacin under visible light irradiation. They were [FeII(dpbpy)2(H2O)2]/TiO2, [FeII(dpbpy)(phen)2]/TiO2 and [FeII(dpbpy)(bpy)2]/TiO2 (dpbpy: 2,2′-bipyridine-4,4′-diphosphoric acid, phen: 1,10-phenanthroline, bpy: 2,2-bipyridyl). The results show that their photocatalytic performance and cyclic stability are much better than that of pure TiO2 or P25. Phenol can be degraded almost completely and the active groups or substituents of norfloxacin (NOR) can be destroyed also, which greatly reduced the biological toxicity of phenol and norfloxacin in water. The possible mechanisms of improving the photocatalytic activity and stability of TiO2 by using Fe-complex are proposed based on free radical capture test and density functional theory calculation. It is clearly that the interfacial interaction between Fe-complex and titanium dioxide directly affects the photocatalytic activity and stability of the composite photocatalyst. The conjugated structure of the complexes plays a crucial role.
关键词： Photocatalystic degradation under visible light,Phenol,Norfloxacin,Fe-complex/TiO2 composite
更新于2025-09-09 09:28:46