Dichlorvos Biyosorpsiyonunun Termodinamik ve Kinetiği

Hülya Kahyaoğlu, Ayten Öztürk

Öz


Diklorvos Dünyanın pek çok ülkesinde olduğu gibi, Türkiye’de de oldukça yaygın olarak kullanılan bir pestisiddir. Dichlorvos’un sulu ortamdan uzaklaştırılmasında Rhodopseudomonas palustris NU51 suşunun kullanılmasıyla ilgili bir çalışmada adsorpsiyon izotermlerinden olan Langmuir ve Freundlich izotermlerine uygunluğu gösterilmiştir. Bu çalışmada termodinamik parametreleri (∆G0, ∆H0, ∆S0)  incelenmiştir. Buna göre biyosorpsiyonun ekzotermik olduğu, kinetik hesaplamalardan da tepkime hızının pseudo ikinci derece denklemine uyduğu ve biyosorpsiyon için aktivasyon enerjisinin yaklaşık 160 kJ mol-1 olduğu tespit edilmiştir. Farklı sıcaklıklarda elde edilen termodinamik verilerden optimal adsorpsiyon sıcaklığının 35o C olduğu belirlenmiştir.

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