[1P01-32] Poster session

[1P02] Experimental and Theoretical Study of Arsenic Adsorption from Hot Spring Water onto Cu and CuO

*Yuiri Mizukoshi¹, Rina Inuzuka, Ayaka Akimoto¹, Takahiro Yamamoto^1,2 (1. Department of Physics, Tokyo University of Science (Japan), 2. RIST, Tokyo University of Science (Japan))

Safe drinking water remains a global issue due to arsenic (As) contamination in groundwater like hot springs. Copper (Cu) and copper oxide (CuO) are promising adsorbents, and carbon nanotubes (CNTs) enhance adsorption capacity. Based on the effects of Cu oxidation, this study clarifies the adsorption kinetics and inhibition mechanisms by coexisting ions. DFT calculations for meta-arsenite (HAsO₂) on Cu and CuO surfaces showed adsorption energies of -1.82 eV and -2.92 eV, respectively. However, SEM-EDS of Cu plates immersed in hot spring water for one week revealed only 0.35% As, suggesting that coexisting ions inhibit adsorption. Therefore, to evaluate the relative adsorption rates of hot spring components, we are using DFT to assess the energy dependence as a function of molecule–Cu distance, and are working to identify specific competing ions or molecules that inhibit HAsO₂ adsorption. These insights will guide the design of efficient, selective adsorbents for safe water treatment.

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