Preparation of functionalized nanocomposites Fe3O4@SiO2-3-aminopropyltrimethoxysilane and its adsorption to Pb(Ⅱ)

In order to solve the indefects that magnetic nano-Fe₃O₄ particles were corroded and agglomerated easily, functional modification was carried out. FeCl₃ and FeSO₄ 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 SiO₂-coated amino-functional nanocomposites Fe₃O₄@SiO₂-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⁻¹. 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>⁰&lt;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>₂=0.0401 g·mg⁻¹·min⁻¹,<i> </i>equilibrium adsorption capacity<i> q</i>_e=80.041 mg·g⁻¹; it is speculated that the adsorption mechanism is mainly complex adsorption and ion exchange.

Comparative study of core-shell nanostructures based on amino-functionalized Fe3O4@SiO2 and CoFe2O4@SiO2 nanocomposites - ScienceDirect

Figure 2 from Facile preparation of magnetic mesoporous MnFe2O4@SiO2-CTAB composites for Cr(VI) adsorption and reduction.

Poly (amidoamine) generation 6 functionalized Fe3O4@SiO2/GPTMS core–shell magnetic NPs as a new adsorbent for Arsenite adsorption: kinetic, isotherm and thermodynamic studies

Design and synthesis of Fe3O4@SiO2@KIT-6@DTZ-Pd0 as a new and efficient mesoporous magnetic catalyst in carbon–carbon cross-coupling reactions

Aminopoly(carboxylic acid)-Functionalized PolyHIPE Beads toward Eliminating Trace Heavy Metal Ions from Water

Pb(II) removal of Fe3O4@SiO2–NH2 core–shell nanomaterials prepared via a controllable sol–gel process - ScienceDirect

Guanidinylated SBA-15/Fe3O4 mesoporous nanocomposite as an efficient catalyst for the synthesis of pyranopyrazole derivatives

Dual immobilization of magnetite nanoparticles and biosilica within alginate matrix for the adsorption of Cd(II) from aquatic phase

Preparation of high-capacity magnetic polystyrene sulfonate sodium material based on SI-ATRP method and its adsorption property research for sulfonamide antibiotics, BMC Chemistry

Illustration steps of Fe3O4@SiO2–NH2 assembly

GEO Publication No. 1/2011

Costa Algarvia, 葡萄牙的出租小楼房和公寓— idealista

Chain-length distribution comparisons between glucans produced by

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