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A triple alkoxo bridged dinuclear cobalt(III) complex mimicking phosphatase and showing ability to degrade organic dye contaminants by photocatalysis
摘要： A dinuclear cobalt(III) complex, [(N3)L1CoIIIL2CoIIIL1] (1), has been synthesized and characterized {H2L1 = 2-((1-hydroxybutan-2-ylimino)methyl)-4-bromophenol and HL2 = 2-amino-1-butanol}. Single crystal X-ray diffraction analysis confirmed its structure. Extended supra-molecular architectures were generated in the complex through weak noncovalent interactions. The energetic features of significant supramolecular interactions have been investigated using DFT calculation and further corroborated with NCI plot index computational tool. The complex has been found to mimic the role of phosphatase enzyme efficiently by transforming 4-nitrophenylphosphate to 4-nitrophenolate at room temperature. The reaction follows Michaelis–Menten enzymatic reaction kinetics with turnover numbers of ~1.4 s-1 in aqueous DMF (98% DMF, v/v) medium. The complex also acts as an efficient photocatalyst for degradation of organic pollutants. Methylene blue (MB), a widely used dye in various industries, was selected as a model pollutant in aqueous media to evaluate the photocatalytic effectiveness of the complex.
关键词： DFT calculation,phosphatase mimicking activity,Photocatalytic degradation of methylene blue (MB),Cobalt(III),Crystal structure
更新于2025-09-23 15:23:52
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Development of Titanium Dioxide (TiO <sub/>2</sub> )-Embedded Buoyant Photocatalyst Balls Using Expanded Polystyrene
摘要： A new immobilization technique of nanoscale TiO2 powders to expanded polystryrene (EPS) balls with temperature-controlled melting method was developed for mass production, and the characterization of TiO2 powder-embedded EPS (TiEPS) balls was evaluated. Based on the scanning electron microscope (SEM) images and associated energy-dispersive X-ray spectroscopy (EDX) analysis, the components of intact EPS balls are carbon and oxygen whereas those of TiEPS balls are carbon, oxygen, and titanium, indicating that TiO2 powders were embedded on the surface of EPS balls. As also evident by the X-ray diffraction (XRD) and FTIR analyses, no significant changes in crystalline structure of TiO2 powders embedded on the EPS balls were found during the preparation and application processes of TiEPS balls. These characterization results indicated that the patches of TiO2 powders were soundly impregnated over the surface of EPS balls without the significant changes in crystalline structure of TiO2 powders and both structural changes and deformation of EPS polymer.
关键词： FTIR,TiO2-Embedded EPS Balls,Photocatalyst,Methylene Blue (MB),Expanded Polystyrene (EPS),X-ray Spectroscopy,TiO2
更新于2025-09-23 15:22:29
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Sunlight driven highly efficient degradation of methylene blue by CuO-ZnO nanoflowers
摘要： Highly efficient photocatalysis of methylene blue dye has been demonstrated using hierarchical copper oxide and zinc oxide (CuO-ZnO) nanoflower like structure. The flower like nanostructures are obtained using polyethylene glycol and sodium citrate with facile single step hydrothermal method. The effect of different operating parameters viz. effect of OH- ion concentration, metal ion precursor and synthesis method on typical morphology of the CuO-ZnO product has been studied in detail. The synthesized samples were characterized by various techniques and were then used in sunlight driven degradation of methylene blue dye. The photocatalytic performance of selected CuO-ZnO product (sample CZ-01) demonstrated the best photocatalytic activity under sunlight irradiation with rate constant of approximately 0.099 min-1. The superior photocatalytic performance of CuO-ZnO was attributed to suppressed charge-carrier recombination. Methylene blue dye (100 mL of 100 ppm) was observed to be completely degraded in 30 minutes with CuO-ZnO (sample CZ-01) hierarchical nanostructure as catalyst.
关键词： ZnO,Methylene blue (MB),CuO,CuO-ZnO,photocatalysis
更新于2025-09-11 14:15:04