NDLI: Removal of uranium (VI) from aqueous solutions by adsorption using a novel electrospun PVA/TEOS/APTES hybrid nanofiber membrane: comparison with casting PVA/TEOS/APTES hybrid membrane

Content Provider	Springer Nature Link
Author	Keshtkar, Ali Reza Irani, Mohammad Moosavian, Mohammad Ali
Copyright Year	2012
Abstract	Polyvinyl alcohol/tetraethyl orthosilicate/aminopropyltriethoxysilane (PVA/TEOS/APTES) nanofiber membrane was prepared by the sol–gel/electrospinning method and its application for adsorption of uranium from aqueous solutions was compared with PVA/TEOS/APTES membrane prepared by sol–gel/casting method. The prepared membranes were characterized by Fourier transform infrared, scanning electron microscope and Brunauer–Emmert–Teller analysis. The surface area of electrospun and casting hybrid membranes obtained were 153 and 282 m$^{2}$ g$^{−1}$, respectively. Experiments were carried out to investigate the influence of different sorption parameters, such as pH, contact time, initial concentration and temperature in a batch system. Results indicated that the pH of 4.5 and high temperature (45 °C at studied condition) proceeded earlier than the adsorption of uranium ions onto the both of prepared membranes. Langmuir, Freundlich and Dubinin–Radushkevich (D–R) isotherm models were applied to describe the equilibrium data of uranium to the prepared membranes at different temperatures (25–45 °C) and the kinetic data were analyzed by pseudo-first-order and pseudo-second-order kinetic models. The maximum adsorption capacity of uranium ions onto the PVA/TEOS/APTES hybrid nanofiber membrane was found to be 168.1 mg g$^{−1}$ with the optimum pH of 4.5 and at the optimum temperature of 45 °C which is more than five-fold greater to that of uranium sorption onto the PVA/TEOS/APTES hybrid membrane (33.61 mg g$^{−1}$ with pH of 4.5 and at a temperature of 45 °C). Thermodynamic parameters were evaluated to understand the nature of adsorption process for uranium ions. The negative values of Gibbs free energy change (∆G°) and positive value of enthalpy change (∆H°) showed that the adsorption of uranium onto both of the electrospun and casting hybrid membranes was feasible, spontaneous and endothermic in studied conditions. The reusability of hybrid membranes was determined after five sorption–desorption cycles and the results showed that these membranes can be utilized extensively in industrial activities.
Starting Page	563
Ending Page	571
Page Count	9
File Format	PDF
ISSN	02365731
Journal	Journal of Radioanalytical and Nuclear Chemistry
Volume Number	295
Issue Number	1
e-ISSN	15882780
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-08-26
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	PVA/TEOS/APTES Hybrid membrane Casting Electrospinning Uranium ion Adsorption Nuclear Chemistry Physical Chemistry Nuclear Physics, Heavy Ions, Hadrons Diagnostic Radiology Inorganic Chemistry
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Pollution Health, Toxicology and Mutagenesis Radiology, Nuclear Medicine and Imaging Analytical Chemistry Public Health, Environmental and Occupational Health Nuclear Energy and Engineering

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