U(VI) İyonlarının Ham ve Modifiye Edilmiş Diyatomit Üzerine Adsorpsiyon Özelliklerinin Kinetik ve Termodinamik Olarak İncelenmesi

Yıl 2017, Cilt: 13 Sayı: 3, 761 - 768, 30.09.2017

Sabriye Yuşan

Öz

Bu çalışmada, giderimi ham ve asit ile modifiye edilmiş diyatomit kullanılarak uranyumun sulu çözeltilerden uzaklaştırılabilirliği araştırılmıştır. Adsorban olarak kullanılan ham ve asit modifiyeli diyatomit örneklerinin karakterizasyonu için SEM, XRD ve TGA/ DTA analiz teknikleri kullanılmıştır. Adsorpsiyon kinetiğinin incelenmesi için üç farklı konsantrasyon ile çalışılmıştır. Elde edilen verilere göre hem ham, hem de asit modifiyeli diyatomit adsorbanı üzerine uranyum iyonlarının adsorpsiyon prosesinin yalancı II. mertebe üzerinden kimyasal adsorpsiyon ile gerçekleştiği görülmüştür. Ayrıca adsorpsiyona sıcaklığın etkisi incelenmiş ve termodinamik parametreler hesaplanmıştır. Her iki adsorban içinde hesaplanan pozitif entalpi, adsorpsiyon prosesinin endotermik olduğunu göstermiştir. Bununla birlikte yine her iki adsorban içinde negatif serbest enerji değişimi, adsorpsiyon prosesinin çalışılan sıcaklıklarda kendiliğinden gerçekleştiğini göstermiştir. Entropinin pozitif değerleri ise, adsorpsiyon prosesi sırasında katı/çözelti ara yüzeyindeki gelişi güzel tutunmanın arttığını göstermiştir.

Anahtar Kelimeler

Adsorpsiyon, Diyatomit, Kinetik parametreler, Termodinamik parametreler

Investigation of the Kinetic and Thermodynamic Properties of U(VI) Ions onto Raw and Modified Diatomite

Öz

In this study, the
removal of uranium from aqueous solutions by natural and modified diatomite has
been investigated. SEM, XRD and TGA/DTA analysis techniques were used for the
characterization of natural and acid modified diatomite samples as adsorbents. The
adsorption process was examined kinetically according to obtained data from
adsorption studies at three different concentrations, and it was found
adsorption process was best described by the pseudo-second-order model with
chemical adsorption. The effect of temperature on the adsorption was also
examined and
thermodynamic parameters were calculated. Positive enthalpy calculated for both
adsorbents have shown that the adsorption process is endothermic. In addition
negative values of free energy change indicated the spontaneity of the
adsorption at the studied temperatures. The positive values of entropy show the
increasing randomness at the solid/solution interface during the adsorption
process.

Anahtar Kelimeler

Adsorption, Diatomite, Kinetic parameters, Thermodynamic parameters

Kaynakça

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