Controllable Preparation of Superparamagnetic Fe₃O₄@La(OH)₃ Inorganic Polymer for Rapid Adsorption and Separation of Phosphate.

Content Provider	Europe PMC
Author	Lu, Yao Jin, Xuna Li, Xiang Liu, Minpeng Liu, Baolei Zeng, Xiaodan Chen, Jie Liu, Zhigang Yu, Shihua Xu, Yucheng
Editor	Blanco, Ignazio
Copyright Year	2023
Abstract	Superparamagnetic Fe3O4 particles have been synthesized by solvothermal method, and a layer of dense silica sol polymer is coated on the surface prepared by sol-gel technique; then La(OH)3 covered the surface of silica sol polymer in an irregular shape by controlled in situ growth technology. These magnetic materials are characterized by TEM, FT-IR, XRD, SEM, EDS and VSM; the results show that La(OH)3 nanoparticles have successfully modified on Fe3O4 surface. The prepared Fe3O4@La(OH)3 inorganic polymer has been used as adsorbent to remove phosphate efficiently. The effects of solution pH, adsorbent dosage and co-existing ions on phosphate removal are investigated. Moreover, the adsorption kinetic equation and isothermal model are used to describe the adsorption performance of Fe3O4@La(OH)3. It was observed that Fe3O4@La(OH)3 exhibits a fast equilibrium time of 20 min, high phosphate removal rate (>95.7%), high sorption capacity of 63.72 mgP/g, excellent selectivity for phosphate in the presence of competing ions, under the conditions of phosphate concentration 30 mgP/L, pH = 7, adsorbent dose 0.6 g/L and room temperature. The phosphate adsorption process by Fe3O4@La(OH)3 is best described by the pseudo-second-order equation and Langmuir isotherm model. Furthermore, the real samples and reusability experiment indicate that Fe3O4@La(OH)3 could be regenerated after desorption, and 92.78% phosphate removing remained after five cycles. Therefore, La(OH)3 nanoparticles deposited on the surface of monodisperse Fe3O4 microspheres have been synthesized for the first time by a controlled in-situ growth method. Experiments have proved that Fe3O4@La(OH)3 particles with fast separability, large adsorption capacity and easy reusability can be used as a promising material in the treatment of phosphate wastewater or organic pollutants containing phosphoric acid functional group.
Journal	Polymers
Volume Number	15
PubMed Central reference number	PMC9824844
Issue Number	1
PubMed reference number	36616595
e-ISSN	20734360
DOI	10.3390/polym15010248
Language	English
Publisher	MDPI
Publisher Date	2023-01-03
Access Restriction	Open
Rights License	Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). © 2023 by the authors.
Subject Keyword	superparamagnetic Fe3O4@La(OH)3 inorganic polymer phosphate adsorption
Content Type	Text
Resource Type	Article
Subject	Chemistry Polymers and Plastics