| 研究実績の概要 |
The first part of JSPS fellowship, we have synthesized family of shape and size-controlled core shell-Cu/Cu2O as a promising visible light photocatalyst, since it possesses a direct band gap (1.9-2.4 eV) and high absorption coefficient across the solar spectrum. The chosen Cu based materials are earth abundant, economically viable for large scale catalytic processes such as organic decomposition. Therefore, we focused a facile one pot approach for systematic well-defined shape and size-controlled core-shell Cu/Cu2O photocatalyst synthesis, characterization and applied as a photocatalyst for model pharmaceutical compound (N-acetyl-para-aminophenol) photo mineralization. Shape control was achieved through the reduction of Cu(II) salts by H4N2.H2O in the presence of polyethylene glycol as a structure-directing agent. The resulting core-shell structure possessed lengths tunable from 200 to 1500 nm, dependents on the time and capping agent concentration. The surface and bulk properties of core-shell Cu/Cu2O photocatalysts was performed by diverse analytical facilities such as DRUVS, powder XRD, HRTEM, SEM and XPS, confirmed the morphology and surface properties. The above synthesized different core-shell catalyst showed excellent photodegradation activity of N-acetyl-para-aminophenol (as a model pharmaceutical pollutant) under visible light. Identification of by-products via HPLC on going experiment.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
During 4 months we have synthesized a series of shape and size-controlled core shell-Cu/Cu2O and characterized them by DRUVS, powder XRD, HRTEM, SEM and XPS, confirmed the morphology and surface properties. The results provided us enough information to go to the next step.
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| 今後の研究の推進方策 |
First phase of the present project will be demonstrating the facile one-pot systematic synthesis of well-defined hollow, core-shell, hierarchical Cu2O photocatalyst and control the morphology for band engineering and position towards visible active. And then synthesis of wide band gap nanofiber/ nanorods TiO2 photocatalyst using low cost, non -toxic precursor. The above core shell/hollow p-type Cu2O embedded in to n-type TiO2 nanofiber catalyst wrapped with RGO to minimize recombination, efficient charge separation properties to enhance antibiotics removal rate. To be check the charge transport properties by DRS-UV, XPS, TPRL etc., To be check the catalytic efficiency by paracetamol model substrate under visible light.
Second phase of the project will be develop new 2D/2D materials e.g. Hollow Cu2O/g-C3N4/RGO composites for visible light photocatalytic activity towards complex Ciprofloxacin, Trimethoprim, Ibuprofen, Iopamidol etc., The 2D/2D material design will be tuning the electronic properties (controlled size, morphology, core shell etc) for efficient utilize visible light region, and then create interfacial interaction between core -shell and bench mark photocatalyst (e.g. TiO2, ZnO) towards overall range light absorption . Finally, the minimize the change recombination by RGO introduction into the heterogeneous composites for prolong decomposition of antibiotics. The electronic, surface/bulk properties, surface area, band position, CB, VB positions and life time properties by various analytical tools.
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