Aktif Karbon Üzerine Perteknetat Oksoanyonunun Denge İzoterm Modelinin Belirlenmesi

Yıl 2019, Cilt: 4 Sayı: 1, 37 - 46, 27.06.2019

Oral Laçin Fatih Demir Burak Bastaban

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

Cited By: 3

Öz

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.

Anahtar Kelimeler

Radyoaktif madde, Aktif Karbon, İzoetrm Modeli, Adsorpsiyon

Determined of Equilibrium Adsorption Isotherm Model Pertechnetate Oxoanion Onto Activated Carbon

Öz

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.

Anahtar Kelimeler

Radioactive Substance, Activated Carbon, Isotherm Models

Kaynakça

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