Fabrication of Stable and Regenerable Amine Functionalized Magnetic Nanoparticles as a Potential Material for Pt(IV) Recovery from Acidic Solutions

• Published in: ACS applied materials & interfaces Vol. 9; no. 22; pp. 18650 - 18659
• Main Authors: Reddy, D. Harikishore Kumar, Wei, Wei, Shuo, Lin, Song, Myung-Hee, Yun, Yeoung-Sang
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 07.06.2017
• Subjects: spinel ferrite; magnetic nanoparticle; adsorption; grafting; Pt(IV) adsorption
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.6b16813

MnFe2O4@SiO2–NH2 magnetic nanocomposite (AFMNC) adsorbent with a particle size of ∼50 nm was successfully synthesized using a facile approach. The as-prepared composite particles showed a fast binding of Pt­(IV) with easy magnetic solid–liquid separation. The kinetic data were fitted to both pseudo-first and second-order rate models, indicating that AFMNC exhibited a much higher rate of Pt­(IV) binding (0.125 g mg–1 min–1) compared to that of commercial ion-exchange resin Amberjet 4200 (0.0002 g mg–1 min–1). The equilibrium adsorption data were fitted to the Langmuir isotherm model with a relatively high sorption capacity of 380 mg/g. Scanning transmission electron microscopy analysis demonstrated the presence of platinum chloride after sorption on AFMNC, suggesting an adsorbate–adsorbent anion-exchange interaction. In addition, due to its magnetic characteristics, AFMNC can be easily separated from the aqueous medium after the sorption process. The novel nanocomposite may facilitate recovery of Pt­(IV) from waste solutions.