POS4-1083
Flow-Through Catalytic Remediation of Water Pollutants Using PVA/Alginate Hydrogels Immobilized with Pd and Pd–Pt Nanoplates
Topic
S4. Colloids, Interfaces, and Molecular Assemblies for Functional Soft Materials
When and Where
Oct 1, 2026
08:30 - 09:30
Room 301 (Grand Ballroom)
Session Chairs
Jinkee HONG
Ki Su KIM
Presenter(s)
Fenni Woro Hastuti (Pukyong National University)
Co-Author(s)
Abstract
We developed palladium (Pd) and palladium–platinum (Pd–Pt) bimetallic nanoplates embedded in
alginate/polyvinyl alcohol (PVA) composite hydrogels for catalytic water remediation. Pd nanoplates,
characterized by their large specific surface area and high density of exposed surface atoms, were
successfully incorporated into the robust and highly porous structure of alginate/PVA hydrogels. An
optimized 1:1 PVA/alginate ratio yielded a stable porous matrix that facilitated efficient mass transport
and enhanced catalytic activity. The resulting nanocomposite embedded with Pd nanoplates was evaluated
for catalytic hydrogenation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) under continuous flow
conditions. At an optimal flow rate of 5 mL·h−1 , the system achieved over 94% conversion of 4-NP and
maintained stable catalytic performance for 12 h. Subsequently, Pd–Pt bimetallic nanoplates were
synthesized via a galvanic replacement reaction, further incorporated into a hydrogel matrix, and applied
for the reduction of hexavalent chromium (Cr(VI)). At an optimal flow rate of 15 mL·h−1 , the system
achieved near-complete Cr(VI) reduction and sustained catalytic activity for 24 h.
alginate/polyvinyl alcohol (PVA) composite hydrogels for catalytic water remediation. Pd nanoplates,
characterized by their large specific surface area and high density of exposed surface atoms, were
successfully incorporated into the robust and highly porous structure of alginate/PVA hydrogels. An
optimized 1:1 PVA/alginate ratio yielded a stable porous matrix that facilitated efficient mass transport
and enhanced catalytic activity. The resulting nanocomposite embedded with Pd nanoplates was evaluated
for catalytic hydrogenation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) under continuous flow
conditions. At an optimal flow rate of 5 mL·h−1 , the system achieved over 94% conversion of 4-NP and
maintained stable catalytic performance for 12 h. Subsequently, Pd–Pt bimetallic nanoplates were
synthesized via a galvanic replacement reaction, further incorporated into a hydrogel matrix, and applied
for the reduction of hexavalent chromium (Cr(VI)). At an optimal flow rate of 15 mL·h−1 , the system
achieved near-complete Cr(VI) reduction and sustained catalytic activity for 24 h.
