Preparation of MIL100/MIL101-alginate composite beads for selective phosphate removal from aqueous solution
Journal
International journal of biological macromolecules
Journal Volume
231
Date Issued
2023-03-15
Author(s)
Alvares, Eric
Tantoro, Stanley
Wijaya, Christian Julius
Soetaredjo, Felycia Edi
Hsu, Hsien-Yi
Angkawijaya, Artik Elisa
Go, Alchris Woo
Hsieh, Chang-Wei
Santoso, Shella Permatasari
Abstract
Numerous studies have reported various approaches for synthesizing phosphate-capturing adsorbents to mitigate eutrophication. Despite the efforts, concerns about production cost, the complexity of synthesis steps, environmental friendliness, and applicability in industrial settings continue to be a problem. Herein, phosphate-selective composite adsorbents were prepared by incorporating alginate (Alg) with MIL100 and MIL101 to produce the MIL100/Alg and MIL101/Alg beads, where Fe3+ served as the crosslinker. The unsaturated coordination bond of MIL100 and MIL101 serves as a Lewis acid that can attract phosphate. The adsorption equilibrium isotherm, uptake kinetics, and effects of operating parameters were studied. The phosphate adsorption capacity of MIL100/Alg (103.3 mg P/g) and MIL101/Alg (109.5 mg P/g) outperformed their constituting components at pH 6 and 30 °C. Detailed evaluation of the adsorbent porosity using N2 sorption reveals the formation of mesoporous structures on the Alg network upon incorporation of MIL100 and MIL101. The composite adsorbents have excellent selectivity toward anionic phosphate and can be easily regenerated. Phosphate adsorption by MIL100/Alg and MIL101/Alg was driven by electrostatic attraction and ligand exchange. Preliminary economic analysis on the synthesis of the adsorbents indicates that the composites, MIL100/Alg and MIL101/Alg, are economically viable adsorbents.
Subjects
Hard soft acid base theory; MOF-alginate composite; Phosphate adsorption
SDGs
Publisher
ELSEVIER
Type
journal article