Sorption studies of strontium on carbon nanotubes using the Box–Behnken design
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Ceren Kütahyalı Aslani
,
Fabio Belloni
Abstract
Adsorption of Sr on multi-walled carbon nanotubes (MWCNTs) was investigated to explore their possible use as an efficient adsorbent for nuclear waste streams. MWCNTs were purified and oxidized with HNO3 prior to testing adsorption. Oxidized MWCNTs were then employed in batch experiments as sorbent of Sr from aqueous solutions. The Box–Behnken experimental design was used to suitably vary the parameters of interest, i.e., temperature, initial Sr2+ concentration, and shaking time. Langmuir, Freundlich and Dubinin–Radushkevich models were applied to fit the adsorption isotherms. The Dubinin–Radushkevich model exhibited the best agreement. Adsorption kinetics was also studied; it was well described by a pseudo-second-order rate model. Adsorption thermodynamics was investigated in the temperature range 293–333 K; the variations of the standard free energy (ΔG○), standard enthalpy (ΔH○) and standard entropy (ΔS○) were obtained. Oxidized MWCNTs show the potential to be a promising candidate for the pre-concentration and solidification of Sr from large volumes of aqueous solution.
©2014 Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- Frontmatter
- The solubility of 242PuO2 in the presence of aqueous Fe(II): the impact of precipitate preparation
- Selective separation of Am(III) from Eu(III) by 2,9-Bis(dialkyl-1,2,4-triazin-3-yl)-1,10-phenanthrolines: a relativistic quantum chemistry study
- Pre-concentration of uranium from water samples by dispersive liquid–liquid micro-extraction
- Studies on U-Zr and U-Pu-Zr alloys for determination of Cl and F using pyrohydrolysis
- Sorption of americium(III) and europium(III) from nitric acid solutions by a novel diglycolamide-grafted silica-based resins: Part 2. Sorption isotherms, column and radiolytic stability studies
- The use of composite ferrocyanide materials for treatment of high salinity liquid radioactive wastes rich in cesium isotopes
- Modeling of cesium sorption on biotite using cation exchange selectivity coefficients
- Sorption studies of strontium on carbon nanotubes using the Box–Behnken design
- A novel approach radiolabeling detonation nanodiamonds through the tritium thermal activation method
- Investigation on the influence of metal ion impurities on the complexation behavior of generator produced 90Y with different bifunctional chelators
