Effects of pH, concentration and temperature on radionuclides sorption onto polyhydroxyethyl methacrylate-expanded perlite composite
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, cilt.295, sa.1, ss.351-355, 2013 (SCI-Expanded)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 295 Sayı: 1
- Basım Tarihi: 2013
- Doi Numarası: 10.1007/s10967-012-1868-x
- Dergi Adı: JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.351-355
- Sivas Cumhuriyet Üniversitesi Adresli: Evet
Özet
Poly (hydroxyethylmethacrylate-expanded perlite) [P(HEMA-EP)], was synthesized and its adsorptive features were investigated for natural radionuclides (TI+, Ra2+, Bi3+, Ac3+ and Pb2+) in aqueous media at differing initial pH, initial radionuclides concentration and adsorption thermodynamics. The amounts of natural radionuclides at equilibrium were determined by gamma spectrometry. The Langmuir adsorption capacities (X-L) were found to be in the order of Pb-212 (0.4 MBq kg(-1)) > Ac-228 and Tl-208 (0.3 MBq kg(-1)) > Ra-226 and Bi-212 (0.2 MBq kg(-1)). These findings indicated that P(HEMA-EP) adsorbed natural radionuclides with high affinity. It was also demonstrated that the adsorption mechanism was spontaneous (Delta G < 0), the process was exothermic (Delta H < 0) thus increasing entropy (Delta S > 0). The composite was reused for four more times after regeneration without any detectable changes either in its structure or adsorptive capability.