In:
Environmental Science: Water Research & Technology, Royal Society of Chemistry (RSC), Vol. 9, No. 4 ( 2023), p. 1205-1215
Abstract:
Effective phosphorus removal and recovery are crucial for protecting the environment because excessive phosphorus release seriously harms the water environment. To efficiently remove phosphate from wastewater, in this study, a novel hydrogel bead adsorbent (SA-0.4La@De) was synthesized by immobilizing La-modified diatomite with sodium alginate (SA). Adsorption tests showed that phosphate removal by SA-0.4La@De correlated with pH 0 of the solution, and SA-0.4La@De performed well in the pH range of 4.0–7.0. The phosphate removal capacity of SA-0.4La@De was maintained in the presence of coexisting ions (SO 4 2− , Cl − , Ca 2+ and Mg 2+ ), while it would be significantly reduced in the presence of CO 3 2− . Meanwhile, the adsorption process of SA-0.4 followed the pseudo-second-order kinetic model and the Freundlich model, with a maximum phosphate capacity of 58.9 mg g −1 . In particular, SA-0.4La@De exhibited a high phosphate removal efficiency of above 92.5% in actual wastewater experiments. Additionally, the characterization and experimental results demonstrated that electrostatic interactions, ligand exchange, and formation of La–P complexes jointly facilitated the adsorption of phosphate. SA-0.4La@De prepared in this study possesses outstanding phosphate adsorption performance, separability, and low cost, providing a new practical choice for phosphate removal and recovery in actual wastewater remediation.
Type of Medium:
Online Resource
ISSN:
2053-1400
,
2053-1419
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
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