Aktif Karbon Üzerine Perteknetat Oksoanyonunun Denge İzoterm Modelinin Belirlenmesi

Year 2019, Volume: 4 Issue: 1, 37 - 46, 27.06.2019

Oral Laçin Fatih Demir , Burak Bastaban

https://doi.org/10.33484/sinopfbd.486647

Cited By: 3

Abstract

Adsorbent olarak aktif karbon kullanılaarak, sulu çözeltierden
radyoaktif ^99mTcO₄^- adsorpsiyonunda
adsorpsiyon prosesinin mekanizmasını araştırmak için iyi bilinen dört izoterm
modeli uygulandı. R² değerlerine göre, deneysel verilerin dört
izoterm modeli için de uygun olduğu bulundu. Ancak, deneysel ve modellerden
hesaplanan adsorpsiyon kapasiteleri karşılaştırıldığında, deneysel verilere en
uygun izoterm modellerinin Langmuir ve Temkin olduğu görülmüştür. Langmuir
izoterm modelinden elde edilen maksimum tek katmanlı adsorpsiyon kapasitesi
değeri 3170 µCi.g-1'dir. Uygun bir adsorpsiyon deneyini gösteren boyutsuz
ayırma faktörü (R_L) değeri  0.126'dır. Ayrıca Freundlich izoterm
modelinde, uygun adsorpsiyonu gösteren adsorpsiyon yoğunluğu (n) değeri
1.72'dir. Adsorpsiyon proses ısısı Temkin İzoterm modelinden 724 J / mol olarak
ve ortalama serbest enerjinin D-R izoterm modelinden 13.4 J / mol olarak  tahmin edilmiştir. Bu verilere göre,
adsorpsiyon sürecinin fiziksel adsorpsiyon ile gerçekleştiği söylenebilir.
Sonuçlar, aktif karbonun, sulu çözeltilerden radyoaktif ^99mTcO₄^-
'ün uzaklaştırılması için başarılı bir adsorbent olduğunu gösterdi.

Keywords

Radyoaktif madde, Aktif Karbon, İzoetrm Modeli, Adsorpsiyon

Determined of Equilibrium Adsorption Isotherm Model Pertechnetate Oxoanion Onto Activated Carbon

Abstract

Four well-known
isotherm models were appropriated to investigate the adsorption process
mechanism in the radioactive
99mTcO₄^- adsorption
from aqueous solution by using activated carbon as adsorbent. According to R² values, the experimental data is found to be suitable
for the four isotherm models. However, when the adsorption capacities of the
experimental and calculated from models are compared, it has been seen that the
isotherm models best suited to the experimental data are Langmuir and Temkin. The maximal monolayer
adsorption capacity value founded from Langmuir isotherm model is 3170 µCi.g^-1. The dimensionless separation
factor (R_L) value indicating a favorable adsorption experiment is
0.126. Also from Freundlich Isotherm model, the adsorption intensity (n) value
which indicates favorable adsorption is 1.72. The heat of adsorption process
was estimated from Temkin Isotherm model to be 724 J/mol and the mean free
energy was estimated from D-R isotherm model to be 13.4 J/mol. According to these data, it can be said that the
adsorption process is realized by physical adsorption. The results showed that
the activated carbon was to be a successful adsorbent for the removal of radioactive
99mTcO₄^-   from aqueous solutions.

Keywords

Radioactive Substance, Activated Carbon, Isotherm Models

References

• [1] Hercigonja Radmila V., Maksin Danijela D., Nastasovic´Aleksandra B., Trifunovic´ Snezˇana S., Glodic´Pavle B., Onjia Antonije 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.[2] Shia Keliang, Houa Xiaolin, Roos Per, Wu Wangsuo, 2012. Determination of technetium-99 in environmental samples: A review, Analytica Chimica Acta, 709,1– 20.[3] A.D. Banavali, J.M. Raimondi, E.M. Moreno, D.E. McCurdy, 1995. The determination of technetium-99 in low-level radioactive waste, Radioact. Radiochem. 6, 26–35.[4] F. Wigley, P.E. Warwick, I.W. Croudace, J. Caborn, A.L. Sanchez, 1999. Optimised method for the routine determination of Technetium-99 in environmental samples by liquid scintillation counting, Anal. Chim. Acta, 380, 73–82.[5] Q.J. Chen, H. Dahlgaard, H.J.M. Hansen, A. Aarkrog, 1990. Determination of 99Tc in environmental samples by anion exchange and liquid-liquid extraction at controlled valency, Anal. Chim. Acta, 228, 163-167. [6] https://www.makaleler.com/teknesyum-nedir (in Turkish)[7]León, M.G., 2005. 99Tc in the Environment: Sources, Distribution and Methods, J. Nucl.Radiochem. Sci. 6, 253–259. [8] http://www.monrol.com.tr/tr/17/urun-detay/montek-99mo-99mtc-jenerator[9] 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.[10] Del Cul, G.D., Bostick, W.D., Trotter, D.R., Osborne, P.E., 1993. Technetium-99 removalfrom process solutions and contaminated groundwater. Sep. Sci. Technol. 28, 551–564.[11] USEPA, 2002. EPA facts about technetium-99. http://www.epa.gov/superfund/health/contaminants/radiation/pdfs/technetium.pdf (20.06.2013).[12]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.[13] 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. [14] 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.[15] 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.[16] Farrell, J., Bostick, W., Jarabek, R.J., Fiedor, J., 1999. Electrosorption and reduction ofpertechnetate by anodically polarized magnetite. Environ. Sci. Technol., 33, 1244–1249.[17] Bors, J., Dultz, S., Riebe, B., 1999. Retention of radionuclides by organophilic bentonite.Eng. Geol., 54, 195–206.[18] 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.[19] 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.[20] Chen, J., Veltkamp, J.C., 2002. Pertechnetate removal by macroporous polymer impregnatedwith 2-nitrophenyl octyl ether (NPOE). Solvent Extr. Ion Exch., 20, 515–524.[21] Langmuir I., 1918. The adsorption of gases on plane surfaces of glass, mica and platinum, JACS, 40,1361-1403. [22] Freundlich H., 1906. Over the adsorption in solution, J. Phys. Chem., 57,1100–1107.[23] Temkin M.I., 1941. Adsorption equilibrium and the kinetics of processes on nonhomogeneous surfaces and in the interaction between adsorbed molecules. Zh. Fiz. Chim., 15, 296-332.[24] Dubinin M.M., 1947. The equation of the characteristic curve of activated charcoal vol. 55, InDokl. Akad. Nauk. SSSR., 55, 327-329.[25] Sarri1 S.P., Misaelides D., Zamboulis X., Gaona M., Altmaier H., Geckeis., 2016. Rhenium(VII) and technetium(VII) separation from aqueous solutions using a polyethylenimine–epichlorohydrin resin. J Radioanal Nucl Chem., 307:681–689.[26] Zu Jianhua, Liu Ruiqin, Zhang Jianqiu, Tang Fangdong, He Linfeng, 2016. Adsorption of Re and 99Tc by means of radiation-grafted weak basic anion exchange resin J Radioanal Nucl Chem., 310:229–237.[27]Mamdoh R., Mahmouda, A., Seliman F., 2014. Evaluation of silica/ferrocyanide composite asadual-functionmaterial for simultaneous removal of 137Cs and 99TcO4- from aqueous solutions Applied Radiation and Isotopes, 91,141–154.