Al-Bentonite Production and Adsorption of 75Se Radioisotope on Al-Bentonite

Öz

In this study, the investigation of Se(IV) adsorption on modified Reşadiye bentonite with aluminium-polioxy cations was investigated. In adsorption experiments, 75Se that was produced by neutron activation in İTÜ TRIGA MARK II nuclear research reactor and has similar chemical properties but shorter half-life with 79Se. Adsorption experiments on modified bentonite were implemented by using batch technique for various time and solid-liquid ratios by using measurements with high resolution gamma spectrometry system. The characterization with XRD, FTIR, and TGA-DTG methods confirmed that aluminium-polioxy cations interchalated to the interlayers and the bentonite structure was not affected. The basal spacing of the modified bentonite and the zeta potential is obtained as 1.853 nm 45.3±6.1 mV, respetively. Due to the realized structural changes, inorganic modification improves the adsorption ability of Reşadiye sodium bentonite from 2% to 100%. Evaluation of adsorption results showed that adsorption mechanism follows the pseudo second order reaction kinetic.

Anahtar Kelimeler

• Adsorption
• Al-bentonite
• waste
• Reşadiye
• selenium
• 75Se

Al-Bentonit Üretimi ve 75Se Radyoizotopunun Al-Bentonitte Adsorpsiyonu

Öz

Bu çalışmada, Se(IV) anyonlarının, aluminyum-polioksi katyonları kullanılarak Reşadiye bentonitinden hazırlanan inorganik bentonite adsorpsiyonu konusunda araştırmalar gerçekleştirilmiştir. Adsorpsiyon deneylerinde ⁷⁹Se ile benzer kimyasal özelliklere sahip ve daha kısa yarı ömürlü ⁷⁵Se radyoizotopu kullanılmıştır. Bu izotop İTÜ TRIGA MARK II nükleer araştırma reaktöründe, nötron aktivasyonu yöntemiyle üretilmiştir. Kesikli adsorpsiyon yöntemi uygulanarak, modifiye bentonitin değişen süre ve katı/sıvı oranı için adsorpsiyon kapasiteleri gamma spektroskopi sisteminde ölçülerek, elde edilmiştir. Alumünyum-polioksi katyonlarının bentonitin aratabakalarına girdiği ve yapıyı etkilemediği, kullanılan XRD, FTIR, TGA/DTG karakterizasyon yöntemleriyle belirlenmiştir. Modifiye bentonitin bazal boşluk mesafesinin 1.853 nm, yüzey yükünün 45.3±6.1 mV olduğu tesbit edilmiştir. Yüzey özelliklerinde meydana gelen değişim nedeniyle, inorganik modifikasyon Reşadiye sodyum bentonitinin selenyum adsorpsiyon verimini1 mM selenyum çözeltisi için %2’den %100 oranına arttırmıştır. Adsorpsiyon deneyleri sonucu, adsorpsiyon mekanizmasının sanal ikinci derece reaksiyon kinetiğine göre gerçekleştiği belirlenmiştir.

Anahtar Kelimeler

• Adsorpsiyon
• Al-bentonit
• atık
• Reşadiye
• selenyum
• 75Se.

Kaynakça

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