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  • Title: Development and application of lanthanum peroxide loaded sepiolite nanocomposites for simultaneous removal of phosphate and inhibition of cyanobacteria growth.
    Author: Shan S, Chen Z, Yuen Koh K, Cui F, Paul Chen J.
    Journal: J Colloid Interface Sci; 2022 Oct 15; 624():691-703. PubMed ID: 35691233.
    Abstract:
    The ecological and environmental problem caused by harmful algal blooms (HABs) is challenging to humans. The simultaneous elimination of cyanobacteria and phosphate from eutrophic waters is of great importance. Herein, a new lanthanum peroxide-loaded sepiolite nanocomposite was fabricated via a facile in-situ co-precipitation method and demonstrated the excellent properties on removal of phosphate and inhibition of cyanobacteria growth. The optimized nanocomposite (termed as LPS30) prepared with a La-to-Sepiolite mass ratio of 0.3:1 demonstrated the best cyanobacteria removal with an effective duration of at least 3 months, due to the even dispersion of high-content LP nanoparticles in the sepiolite. LPS30 exhibited a high phosphate uptake (52.68 mg-P/g), fast uptake kinetics (∼45 min to reach 80% of ultimate uptake), and relatively higher selectivity in the presence of competing matters. The pH-dependent phosphate sorption resulted from the ligand exchange between phosphate and surface functional groups (e.g., peroxo and hydroxyls), and the electrostatic attraction. The efficient and long-lasting inhibition for cyanobacteria regrowth was attributed to the combined effect of the oxidative species (i.e., LaOO-) and the efficient removal of phosphate through the coagulation flocs. Our study demonstrated that LPS30 is a promising material to simultaneously treat phosphate and algae for HABs management.
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