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

Abstract

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.

Keywords

• Adsorpsiyon,Diyatomit,Kinetik parametreler,Termodinamik parametreler

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

Abstract

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.

Keywords

• Adsorption,Diatomite,Kinetic parameters,Thermodynamic parameters

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