Investigation of strontium sorption onto Kula volcanics using Central Composite Design
Küçük Resim Yok
Tarih
2012
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Science Bv
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In performance assessment studies, the uptake of the radioactive elements by rock formations play an important role in retarding their aqueous phase migration. Sorption studies of radionuclides have been conducted to obtain data on the distribution coefficient (K-d) that is as an input parameter in the performance assessment of the geological disposal of radioactive wastes. In this work, sorption experiments were studied in a batch sorption system using Sr(NO3)(2) solution on non-treated and HCl-treated Kula volcanics. The distribution coefficient (K-d) values of Sr2+ derived from batch experiments were used to evaluate the migration behavior of Sr2+. Central Composite Design was used in the experiments. Sr sorption was studied as a function of pH, temperature, initial concentration of adsorbate and contact time. The results show that the K-d values are higher at pH 7-9 which is the pH range of the natural waters. The kinetic data conformed better to the pseudo-second-order equation. Thermodynamic parameters Delta H degrees, Delta S degrees and Delta G degrees were estimated and these parameters show that adsorption is endothermic. The correlation coefficients indicate that the Langmuir model fits better for the strontium sorption onto non-treated and HCl-treated Kula volcanics with monolayer capacities as 2.04 and 1.72 mg/g, respectively. (C) 2011 Elsevier B.V. All rights reserved.
Açıklama
Anahtar Kelimeler
Strontium, Sorption, Radionuclide migration, Central Composite Design, Kula volcanics
Kaynak
Journal of Hazardous Materials
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
201
