Highly water-permeable WO $_{3}$ -containing porous hydrogel via freeze-crosslinking for efficiency and salt-robust dye Decolorization

Sugita, Tsuyoshi ; Ueda, Yuki ; Nakabe, Rintaro; Mori, Masanobu*; Nankawa, Takuya ; Sekine, Yurina

We developed a WO $_{3}$ -embedded hydrogel (WFG) by freeze-cross-linking that retained high activity even in the presence of coexisting salts. Confocal laser scanning microscope revealed interconnected channels < 200 m. ensuring good water permeability, and contrast-matching small-angle neutron scattering showed that the secondary particle size of embedded WO $_{3}$ (~300 nm) matched that in aqueous suspension. Under visible-light irradiation, WFG decolorized indigo carmine (INC) 1.5-fold increase in rate than suspended WO $_{3}$ and 3.7-fold increase in rate than a WO $_{3}$ -coated glass plate. Coexisting salts (NaNO $_{3}$ , NaCl, Na $_{2}$ SO $_{4}$ , NaH $_{2}$ PO $_{4}$ ) altered the decolorization efficiency; NaNO $_{3}$ and Na $_{2}$ SO $_{4}$ enhanced, whereas Cl $^{-}$ and H $_{2}$ PO $_{4}$ $^{-}$ suppressed the reaction, indicating that ionic strength and anion-species affect contact efficiency and charge transfer.

Language	:	English
Journal	:	Journal of Photochemistry and Photobiology A; Chemistry
Volume	:	473
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Pages	:	p.116773_1 - 116773_9
Publication Year/Month	:	2026/04
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Paper URL	:	https://doi.org/10.1016/j.jphotochem.2025.116773
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Keywords	:	photocatalyst; hydrogel; water purification; organic dye; visible light
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Press Release	:	"塩分"の多い水も浄化光で力を引き出す新材料を開発; 環境負荷ゼロで産業排水や海水など幅広い水処理へ
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Registration No. : AA20250353
JAEA Abstracts No. : 54000436
Paper Submission No. : 30848

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Highly water-permeable WO-containing porous hydrogel via freeze-crosslinking for efficiency and salt-robust dye Decolorization

Highly water-permeable WO $_{3}$ -containing porous hydrogel via freeze-crosslinking for efficiency and salt-robust dye Decolorization