Phosphate recovery from aqueous phase using novel zirconium-based adsorbent

Yugo Uematsu; Fumihiko Ogata; Riko Okamoto; Mineaki Kabayama; Naohito Kawasaki

doi:10.1016/j.heliyon.2024.e29649

Phosphate recovery from aqueous phase using novel zirconium-based adsorbent

Heliyon. 2024 Apr 14;10(8):e29649. doi: 10.1016/j.heliyon.2024.e29649. eCollection 2024 Apr 30.

Authors

Yugo Uematsu¹, Fumihiko Ogata¹, Riko Okamoto¹, Mineaki Kabayama², Naohito Kawasaki^{1

3}

Affiliations

¹ Faculty of Pharmacy, Kindai University, 3-4-1, Kowakae, Higashi-Osaka, Osaka, 577-8502, Japan.
² BIRCH Lab., 214, Akinokamikamihonjyou, Seto-cho, Naruto, Tokushima, 771-0360, Japan.
³ Antiaging Center, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka, 577-8502, Japan.

Abstract

This study aims to document the phosphate ion (PO₄^3-) adsorption capacity of a novel zirconium-based adsorbent. The physicochemical properties of the adsorbent are investigated using an array of methods and metrics such as electron microscopy, X-ray diffraction, thermal analysis, specific surface area, pore volume, pH point of zero charge (pH_pzc), and surface hydroxyl groups. The batch method is used to elucidate PO₄^3- adsorption capacity. Results suggested that the adsorption of PO₄^3- was based on an internal diffusion and a monolayer adsorption. We also clarified that the pH of the solution significantly impacted the adsorption. Moreover, the adsorbent shows the ability to not only adsorb but also desorb PO₄^3- for at least five cycles, based on an adsorption mechanism that we document. These findings indicate that this adsorbent could serve as a major industrial PO₄^3- adsorbent.

Keywords: Adsorption; Phosphate ion; Zirconium.