Research

This study investigates serpentinization—water–(ultra)mafic rock reactions—under diverse geochemical conditions to elucidate the mechanisms and kinetics of H₂, CH₄, and organic acid production and to translate these insights into industrial applications. Analytical methods (GC, IC, ICP-OES) and mineral characterization techniques (BET, XRD, XRF, Fe K-edge XANES) are employed to quantify gas generation, aqueous chemistry, and mineralogical transformations during batch-reactor experiments using peridotite, basalt, olivine, pyroxenes, and magnetite.

The effects of pH, temperature, and CO₂ injection on reaction rates and secondary mineral formation are systematically evaluated, with particular emphasis on the catalytic roles of magnetite and sorbed Fe(II) in hydrogen production and constraints on abiotic methane formation pathways.

Building on these mechanistic insights, the study further explores process-oriented hydrogen production using subcritical water extraction (SWE) and microwave-assisted treatment, and assesses the CO₂ mineralization potential of reaction byproducts. By integrating reaction kinetics, geochemical evolution, and engineering applications, this work advances understanding of Earth’s early redox environments while contributing to scalable, low-carbon hydrogen production and carbon sequestration technologies.

This study develops an integrated strategy for radioactive wastewater management using zeolites with high ion-exchange capacity and strong thermal and radiation stability. 

The objectives are to achieve simultaneous removal of multiple radionuclides (e.g., Cs–Sr–Co and actinide/lanthanide elements), long-term stabilization of spent zeolites, and scalable treatment of large volumes of contaminated water.

Adsorption kinetics and competitive behavior in multicomponent systems will be evaluated to determine optimal zeolite combinations under varying pH and ionic conditions. Radionuclide-loaded zeolites will then be immobilized through thermal, hydrothermal, and microwave treatments, and their long-term stability will be assessed via leaching tests and structural analyses. 

Finally, a pilot-scale CSTR-based process will be designed to validate practical decontamination performance.