A radioactively durable melamine-styrene based polymer: Highly efficient removal of Sr-90


Karabayir E., ÖZDEMİR A., Şenkal B. F. , Taskin O. S.

APPLIED RADIATION AND ISOTOPES, cilt.149, ss.96-103, 2019 (SCI İndekslerine Giren Dergi) identifier identifier identifier

  • Cilt numarası: 149
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1016/j.apradiso.2019.04.024
  • Dergi Adı: APPLIED RADIATION AND ISOTOPES
  • Sayfa Sayıları: ss.96-103

Özet

Removal of strontium has a vital importance for radioactive waste management due to its long half-life. In this context, melamine-styrene based polymer (MSBP) was synthesized and characterized by different spectrophotometric methods. Sr2+ ions were removed from the solution using MSBP sorbent. In this respect, adsorption of Sr(2+)onto melamine-based polymer was studied as a part of pH, amount of adsorbent, initial Sr(2+)concentration, contact time, temperature and particle size. Also, adsorption rate of radioactive strontium was investigated by using LSC (Liquid Scintillation Counter). The adsorption data were fitted to Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherm models. MSBP sorbent reached maximum adsorption capacity for Sr2+ as 142.9 mg.g(-1). Thermodynamic parameters such as free energy (Delta G(0)), entropy (Delta S-0) and enthalpy (Delta H-0) of Sr2+ adsorption on MSBP were examined at five different temperatures of 293 K, 303 K, 313 K, 323 K and 333 K. 0 < Delta H-0 values indicated that sorption mechanism presented endothermic feature. 0 > Delta G(0) and 0 < Delta S-0 revealed that Sr2+ adsorption on MSBP occurred spontaneously and irreversible, respectively. Pseudo first and second orders were investigated as a part of kinetic parameters and seen that pseudo second order was much more convenient for adsorption of Sr2+ onto MSBP.