RADYOAKTIF PERTEKNETAT OKSO ANYONU ADSORPSIYONUNUN TERMODINAMIK ANALIZI

Kesikli sistemde çalışılan adsorpsiyon tekniği ile aktif karbon üzerine radyoaktif perteknetat oksoanyonu (99mTcO4-)’nun adsorpsiyon termodinamiğinin incelenmesi amaçlanmıştır. Elde edilenverilerden faydalanarak termodinamik parametreler; ∆Ho=0,346 kJ.mol-1, ∆So=0,029 kJ.mol-1, ∆Go= -7,92(288 K) ile -8,78 (318 K) kJ.mol-1, ∆Hx=0,28 kJ.mol-1ve standart serbest enerji değerinin sıfır olduğusıcaklık 12 K olarak hesaplanmıştır. Bu bulgular sonucunda adsorpsiyon prosesinin; fiziksel veendotermik olarak gerçekleştiği ve 12 K’in üzerindeki her sıcaklıkta adsorpsiyonun uygun vekendiliğinden gerçekleşeceği bulguları elde edilmiştir. Sonuç olarak, belirli bir limitin üzerineçıkıldığında kansere neden olan radyoaktif teknesyumun aktif karbon üzerine adsorpsiyontermodinamik analizinin incelenmesi sonucu elde edilen bulguların endüstriyel çapta kurulacak bir tesisdizaynına katkıda bulunacağı söylenebilir.

Thermodynamic Analysis of Radioactive Pertechnetate Oxo Anion Adsorption

The aim of this study is to investigate thermodynamics of radioactive pertechnetate okso anion (99mTcO4-) over the active carbon using the adsorption technique in batched systems. According to the obtained results thermodynamic parameters are calculated as ∆Ho=0.346 kJ.mol-1 , ∆So=0.029 kJ.mol-1,∆Go= -7.92 (15oC) ile -8.78 (45oC) kJ.mol-1, ∆Hx=0,28 kJ.mol-1 and also the temperature at which the standart free energy value equals to zero calculated as 12 K. These results indicated that the adsorption process is physical and endothermic and at temparatures over 12 K adsorption will take place spontaneously and favorably. In conclusion, it can be said that the results obtained from the thermodynamic analysis of radioactive technetium (which may cause cancer if the limit is exceeded) over the active carbon can contribute to the design of an industrial facility.

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Banavali, A.D., Raimondi, J.M., Moreno, E.M., McCurdy, D.E., 1995, “The determination of technetium-99 in low-level radioactive waste”, Radioact. Radiochem., 6, 26–35.
Bastaban, B., 2014, “Teknesyum (99mTc) Elementinin Aktif Karbon Yardımıyla Adsorbsiyonu” Atatürk Üniversitesi Fen Bilimleri Enstitüsü, Yüksek Lisans Tezi.
Bishop, M.E., Dong, H., Kukkadapu, R.K., Liu, C., Edelmann, R.E., 2011, “Bioreduction of Febearing clay minerals and their reactivity toward pertechnetate (Tc-99)”, Geochim. Cosmochim. Acta, 75, 5229– 5246.
Bors, J., Dultz, S., Riebe, B., 1999, “Retention of radionuclides by organophilic bentonite”, Eng. Geol., 54, 195–206.
Chen, J., Veltkamp, J.C., 2002, “Pertechnetate removal by macroporous polymer impregnated with 2- nitrophenyl octyl ether (NPOE)”, Solvent Extr. Ion Exch., 20, 515–524.
Chowdhury, S., Mishra, R., Saha, P., & Kushwaha, P., 2011, “Adsorption thermodynamics, kinetics and isosteric heat of adsorption of malachite green onto chemically modified rice husk”, Desalination, 265(1-3), 159-168.
Del Cul, G.D., Bostick, W.D., Trotter, D.R., Osborne, P.E., 1993, “Technetium-99 removal from process solutions and contaminated groundwater”, Sep. Sci. Technol., 28, 551–564.
Farrell, J., Bostick, W., Jarabek, R.J., Fiedor, J., 1999, “Electrosorption and reduction of pertechnetate by anodically polarized magnetite”, Environ. Sci. Technol., 33, 1244–1249.
Fu, F., Wang,Q., 2011, “Removal of heavy metal ions from wastewaters: a review”, J. Environ.Manage, 92, 407–418.
HercigonjaRadmila V., Maksin Danijela D., Nastasovic´Aleksandra B., Trifunovic´ Snezˇana S., Glodic´Pavle B., OnjiaAntonije E., 2012, “Adsorptive Removal of Technetium-99 Using Macroporous Poly (GMA-co-EGDMA) Modified with Diethylene Triamine”, Journal of Applied Polymer Science, Vol. 123, 1273–1282.
Holm, E., Gäfvert, T., Lindahl, P., &Roos, P. 2000, “In situ sorption of technetium using activated carbon”, Applied Radiation and Isotopes, 53(1-2), 153-157.
Kumar, P.S., Senthamarai, C., Sai Deepthi, A.S.L., Bharani, R., 2013, “Adsorption isotherms, kinetics and mechanism of Pb(II) ions removal from aqueous solution using chemically modified agricultural waste”, Can. J. Chem. Eng. 91, 1950–1956.
Kumar, S., Rawat, N., Kar, A.S., Tomar, B.S., Manchanda, V.K., 2011, “Effect of humic acid on sorption of technetium by alumina”, J. Hazard. Mater., 192, 1040–1045.
León, M.G., 2005, “99Tc in the Environment: Sources, Distribution and Methods”, J. Nucl. Radiochem. Sci. 6, 253–259.
Liang, L., Gu, B., Yin, X., 1996, “Removal of technetium-99 from contaminated ground water with sorbents and reductive materials”, Sep. Technol. 6, 111–112.
Lieser, K.H., Bauscher, C.H., 1988, “Technetium in the hydrosphere and in the geosphere. II. Influence of pH, of complexing agents and of some minerals on the sorption of technetium”, Radiochim. Acta, 44, 125–128.
Dogan, M., Alkan, M., 2003, “Removal of methyl violet from aqueous solution by perlite”, J. Colloid Interface Sci., 267, 32–41.
Mahmoud, M. R., Seliman, A. F. 2014, “Evaluation of silica/ferrocyanide composite as a dualfunction material for simultaneous removal of 137Cs+ and 99TcO4− from aqueous solutions”, Applied Radiation and Isotopes, 91, 141-154.
Peter AtkinsandJulio de Paula, 2014, PhysicalChemistry 10th Edition Edition- 10th Edition oxforduniversitypress-newdelhi.
Pubchem,https://pubchem.ncbi.nlm.nih.gov/compound/SODIUM%20PERTECHNETATE#section=R elated-Compounds-with-Annotation.
Rout,T.K., Sengupta, D.K., Besra, L., 2006, “Flocculationimprovesuptake of 90Sr and 137Cs fromradioactiveeffluents”, Int.J.Miner.Process., 79, 225–234.
Sangvanich,T., Sukwarotwat, V., Wiacek, R.J., Grudzien, R.M., Fryxell, G.E., Addle- man, R.S., Timchalk, C., Yantasee,W., 2010, “Selectivecapture of cesiumandthalliumfromnaturalwatersandsimulatedwasteswithcopperferrocyanidefunctionalizedmesop oroussilica”, J.Hazard.Mater.,182, 225–231.
Shakira, K., Ghoneimya, H.F., Hennawyb, I.T., Elkafrawyc, A.F., Beheira, S.G.E., Refaata, M., 2011, “Simultaneous removal of chromotrope 2B and radionuclides from mixed radioactiveprocess wastewater using organo‐bentonite”, Eur. J. Chem., 2, 83–93.
Shia Keliang, HouaXiaolin, Roos Per, Wu Wangsuo, 2012, “Determination of technetium-99 in environmental samples: A review”, Analytica Chimica Acta, 709, 1– 20.
Suzuki, T., Fujii, Y., Yan,W., Mimura, H., Koyama, S., Ozawa, M., 2009, “Adsorption behavior of VII group elements on tertiary pyridine resin in hydrochloric acid solution”, J. Radioanal. Nucl. Chem., 282, 641–644.
USEPA, 2002, “EPA facts about technetium-99”, https://www.epa.gov/radiation/radionuclide-basicstechnetium-99