Doğal Kil Minerali Beydellit İle Sulu Çözeltilerden Co (II) Adsorpsiyonu

Yıl 2016, Cilt: 16 Sayı: 3, 617 - 630, 31.12.2016

Mehmet Salim Öncel

Öz

Bu çalışmada, doğal kil minerali olan beydellit kullanılarak atıksulardan kobalt giderimi araştırılmıştır.

Kobalt adsorbsiyon kapasitesi için beydellit dozajı (0.2-20 g/l), başlangıç Co (II) konsantrasyonu (50-

1000 mg/l), sıcaklık (293-333 0K) ve çözelti pH değerleri 2-7 çalışılmıştır. En yüksek adsorbsiyon pH 6-7

aralığında gözlenmiştir. 100 dakika temas süresi, pH 7 ve 50-400 mg/l kobalt konsantrasyonunda sırası

ile % 99,5-86,8 giderme verimi bulunmuştur. Kinetik verilerden farklı başlangıç kobalt (II)

konsantrasyonlarında (50-1000 mg/l) adsorbsiyonun hızlı ve 40 dakikada tamamlandığı ve daha sonra

dengeye geldiği tespit edilmiştir. Verilerin yalancı ikinci mertebe modele yüksek korelasyon katsayıları

ile uyduğu görülmüştür (r2>0.985). pH 7 ve 50-1000 mg/l de Co (II) adsorbsiyon kapasitesi Langmuir

izoterminden 21,13 mg/g olarak hesaplanmıştır. Entalpi

o (H ), serbest enerji(

o G ) ve entropi

o (S ) gibi termodinamik parametreler 283-333 0K arasında sırası ile -2.01, 7.27-8.31 ve 0.031

kJ/mol oK olarak hesaplanmıştır. Bu sonuçlar göre beydellit üzerine Co (II) üzerine adsorbsiyonu

endotermik bir proses olup adsorpsiyon yüksek sıcaklıkta daha iyi sonuç vermiştir. Bu çalışma

göstermiştir ki doğal kil minerali beydellit atıksulardan kobalt gideriminde etkili bir adsorbenttir.

Adsorption

Anahtar Kelimeler

Beydellit”, “Kobalt”, “Adsorbsiyon”, “İzoterm”, “Kinetik”

Kaynakça

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