Thermodynamic Analysis of Radioactive Pertechnetate Oxo Anion Adsorption

Abstract

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.

Keywords

• Radioactive Substance,Activated Carbon,Thermodynamic,Adsorption

RADYOAKTIF PERTEKNETAT OKSO ANYONU ADSORPSIYONUNUN TERMODINAMIK ANALIZI

Öz

Kesikli sistemde çalışılan adsorpsiyon tekniği ile aktif karbon üzerine radyoaktif perteknetat okso anyonu (99mTcO4-)’nun adsorpsiyon termodinamiğinin incelenmesi amaçlanmıştır. Elde edilen verilerden 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 olduğu sıcaklık 12 K olarak hesaplanmıştır. Bu bulgular sonucunda adsorpsiyon prosesinin; fiziksel ve endotermik olarak gerçekleştiği ve 12 K’in üzerindeki her sıcaklıkta adsorpsiyonun uygun ve kendiliğinden gerçekleşeceği bulguları elde edilmiştir. Sonuç olarak, belirli bir limitin üzerine çıkıldığında kansere neden olan radyoaktif teknesyumun aktif karbon üzerine adsorpsiyon termodinamik analizinin incelenmesi sonucu elde edilen bulguların endüstriyel çapta kurulacak bir tesis dizaynına katkıda bulunacağı söylenebilir.

Anahtar Kelimeler

• Radyoaktif madde,Aktif Karbon,Termodinamik,Adsorpsiyon

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