Synthesis of iron-modified montmorillonite/Al2O3 composite adsorbents and their phosphorus adsorption performance study

Research Square (Research Square), Journal Year: 2025, Volume and Issue: unknown

Published: April 25, 2025

The presence of excessive phosphate in aquatic systems can trigger eutrophication processes, causing detrimental impacts on ecological balance. This research developed an innovative phosphorus-adsorbing composite material through iron-modified montmorillonite integrated with Al₂O₃, synthesized via surface modification coupled hydrothermal calcination (Fe/AlPMt), for phosphorus management. pH optimization experiments demonstrated Fe/AlPMt's effective removal capability across extended acidic range (pH 3.0–6.0). displayed superior selectivity compared to competing anions. Kinetic analysis revealed that the adsorption process conformed a second-order reaction model, particle internal diffusion identified as dominant mechanism. Equilibrium studies indicated satisfactory alignment both Freundlich and Tempkin isotherm models adsorption. Field testing lake water achieved remarkable 99% elimination at 0.3 g/L dosage. Adsorption mechanisms involved multiple pathways: electrostatic attraction, ligand substitution reactions, precipitate formation surfaces. maintained 95.8% efficiency after five regeneration cycles, demonstrating robust recyclability. These results position Fe/AlPMt viable solution phosphorus-contaminated wastewater remediation.

Language: Английский

Enhanced scavenging and recovery of low-concentration phosphate from secondary effluents using lanthanum-incorporated layered double hydroxide composites

Process Safety and Environmental Protection, Journal Year: 2025, Volume and Issue: unknown, P. 107224 - 107224

Published: April 1, 2025

Language: Английский