Preparation of functionalized nanocomposites Fe3O4@SiO2-3-aminopropyltrimethoxysilane and its adsorption to Pb(Ⅱ)
4.7 (333) In stock
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.
Design and synthesis of Fe3O4@SiO2@KIT-6@DTZ-Pd0 as a new and efficient mesoporous magnetic catalyst in carbon–carbon cross-coupling reactions
Guanidinylated SBA-15/Fe3O4 mesoporous nanocomposite as an efficient catalyst for the synthesis of pyranopyrazole derivatives
Polymers, Free Full-Text
Nanomaterials, Free Full-Text
Full article: Simultaneous removal of Pb(II), Cd(II) and bacteria from aqueous solution using amino-functionalized Fe3O4/NaP zeolite nanocomposite
Novel magnetically separable anhydride-functionalized Fe 3 O 4 @SiO 2 @PEI-NTDA nanoparticles as effective adsorbents: synthesis, stability and recycl - RSC Advances (RSC Publishing) DOI:10.1039/C8RA10310K
Figure 9 from Facile preparation of magnetic mesoporous MnFe2O4@SiO2-CTAB composites for Cr(VI) adsorption and reduction.
Ultrasonic preparation of new nanocomposites poly(GMA)@amino-functionalized Fe3O4: structural, morphological and thermal properties
Illustration steps of Fe3O4@SiO2–NH2 assembly
尊榮享受!小改款配備再升級Mercedes-Benz GLE 450 4MATIC 試駕
- Fruit of the Loom Women's Extreme Comfort Bra 9292, Sand, 38DD at
- Multi Modal Cotton Print Premium Shirt – The Foomer
- Nala Lingerie: Aussies wake up to underwear on their windscreen in
- Annalise Clover Heart Necklace - Rose Gold
- Time and Tru Women's High Rise Knit Capri Leggings
- Women's Seamless Essential Bra with Pads, Comfort Wireless Push Up Vest Brassiere Bra, women's lingerie & underwear