| 研究実績の概要 |
Most metal organic frameworks (MOFs) have been developed for gas storage not for water treatment. As the first step, we have mainly focused on synthetic process of Zr-fumarate MOFs, which are highly stable in aqueous solutions. We tried more than 100 synthetic conditions with the different parameters: linker species, linker concentrations, reaction time, reaction temperatures in microwave-assisted rapid water-based synthesis. As a result, the synthetic condition has been optimized. The product was applied to the popular CO2 and water vapor adsorption study. Additionally, we have evaluated the adsorption efficiencies of hazardous oxyanions species such as selenite (Se(IV)), selenate (Se(VI)), antimonite (Sb(III)) and antimonate (Sb(V)) on these developed MOFs in the aqueous environments, which have been rarely studied. The combination of the microwave-assisted heating and modulated water based hydrothermal synthesis succeeded to form highly stable MOFs showing superior adsorbent behavior of CO2, water vapor, and selenium oxyanions.
We extended to another synthetic method which is ultrasonication assisted facile synthesis of Zr-MOFs for adsorption characteristics of CO2, water vapor, and Sb(III), Sb(V) species. We have successfully established new approached developed MOFs for adsorptive removal of CO2, water vapor, and antimonite (Sb(III)) and antimonate (Sb(V)) from the aqueous environments.
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| 今後の研究の推進方策 |
We need to accelerate for the development of novel MOF@CLAY composites by the green synthetic approach and their application for the development of novel photocatalysts for environmental remediation. Based on the last fiscal year achievements, we are proposing microwave-assisted synthesis of Zr-UIO66-NH2@sepiolite clay composite (1) for visible-light-driven photocatalytic activity toward degradation of dye molecules, and (2) for selective extraction of Pd/ Pt from highly acidic solution and reusability of highly dispersed Pd/Pt nanoparticles anchored on UiO-66-NH2@sepiolite composite residue as a reusable visible-light-driven photocatalyst for reduction of Cr(VI).
Facile synthesis and characterization of highly stable Zr-UIO66-NH2@sepiolite composites and evaluation of photocatalytic activity toward RhB dye (Apr-June), selective extraction of Pd/Pt from the highly acidic solution (July).
Optimization of reduction conditions to convert highly dispersed Pd/Pt nanoparticles on UiO-66(NH2)@sepiolite composite and characterization (Aug-Sep).
Application of nanoparticle Pd/Pt decorated MOF@Clay composites for Cr(VI) reduction. A compilation of reports and, publishing research manuscripts (Oct-Nov).
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