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In order to solve the indefects that magnetic nano-Fe<sub>3</sub>O<sub>4</sub> particles were corroded and agglomerated easily, functional modification was carried out. FeCl<sub>3</sub> and FeSO<sub>4</sub> were used as raw materials and ammonia as preci-pitant in the presence of ultrasonic irradiation, then functionalized by ethyl orthosilicate (TEOS) and 3-aminopropyltrimethoxysilane (APTMS) to prepare SiO<sub>2</sub>-coated amino-functional nanocomposites Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>-APTMS. The magnetic nanocomposites were characterized by TEM, FTIR, VSM, TGA, low temperature nitrogen adsorption and XRD, etc. The characterized results show that the magnetic nanocomposites prepared by ultrasonic strengthening method have the characteristics of strong magnetic response, strong acid and alkali resistance, high dispersion, large specific surface area and small particle size.Meanwhile, the adsorption effects of magnetic nanocomposites for Pb(Ⅱ) were investigated. The results show that the initial pH value of the solution and the dosage of adsorbent have greatest effects on the adsorption effect of Pb(Ⅱ) with the initial pH value of the solution 5.86 and the dosage of adsorbent 1.0-1.5 g·L<sup>−1</sup>. The Langmuir model is suitable for simulating the isothermal adsorption process, and the adsorption process is a spontaneous process when Gibbs free energy change <i>∆G</i><sup>0</sup><0. The adsorption behavior of Pb(Ⅱ) can be well described by quasi-second-order kinetics on the composites,<i> </i>Quasi-second-order kinetic constant<i> k</i><sub>2</sub>=0.0401 g·mg<sup>−1</sup>·min<sup>−1</sup>,<i> </i>equilibrium adsorption capacity<i> q</i><sub>e</sub>=80.041 mg·g<sup>−1</sup>; it is speculated that the adsorption mechanism is mainly complex adsorption and ion exchange.
Dual immobilization of magnetite nanoparticles and biosilica within alginate matrix for the adsorption of Cd(II) from aquatic phase
PDF) Adsorption of Cr(Ⅵ) polluted water by Fe3O4@SiO2-APTMS nanocomposites prepared in the presence of ultrasonic irradiation for sustainable water resources utilization
Preparation of functionalized nanocomposites Fe3O4@SiO2-3- aminopropyltrimethoxysilane and its adsorption to Pb(Ⅱ)
Full article: Simultaneous removal of Pb(II), Cd(II) and bacteria from aqueous solution using amino-functionalized Fe3O4/NaP zeolite nanocomposite
Zero-valent iron nanoparticles for environmental Hg (II) removal: a review [PeerJ]
Ultrasonic preparation of new nanocomposites poly(GMA)@amino-functionalized Fe3O4: structural, morphological and thermal properties
Preparation of functionalized nanocomposites Fe3O4@SiO2-3- aminopropyltrimethoxysilane and its adsorption to Pb(Ⅱ)
Figure 2 from Facile preparation of magnetic mesoporous MnFe2O4@SiO2-CTAB composites for Cr(VI) adsorption and reduction.
Synthesis of diglycolic acid functionalized core-shell silica coated Fe3O4 nanomaterials for magnetic extraction of Pb(II) and Cr(VI) ions
Full article: Simultaneous removal of Pb(II), Cd(II) and bacteria from aqueous solution using amino-functionalized Fe3O4/NaP zeolite nanocomposite
Adsorption of heavy metal ions in water by surface functionalized magnetic composites: a review - Environmental Science: Water Research & Technology (RSC Publishing) DOI:10.1039/D1EW00868D
Preparation of high-capacity magnetic polystyrene sulfonate sodium material based on SI-ATRP method and its adsorption property research for sulfonamide antibiotics, BMC Chemistry
3-Aminopropyl)trimethoxysilane-Functionalized Titanium Dioxide Thin-Film Nanocomposite Membrane: Enhanced Rejection Performance for Unary and Binary High-Salt Wastewater
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