GO ve GO-EDTA kullanılarak sulu çözeltiden Thioflavin T ve Co (II) iyonlarının uzaklaştırılması; adsorpsiyon parametrelerinin araştırılması

Yıl 2024, Cilt: 39 Sayı: 1, 371 - 384, 21.08.2023

Eda Gökırmak Söğüt , Metin Çelebi

https://doi.org/10.17341/gazimmfd.1091585

Öz

Boyalar ve ağır metaller, artan çevresel kaygıların tipik kirleticileridir. GO ve GO-EDTA yapılarının sulu çözeltiden TFT boya ve Co (II) metal iyonu giderimi için ideal adsorbanlar olduğu belirtildi. pH, zaman, farklı konsantrasyon aralığı ve farklı tuzların etkisi gibi çözelti koşullarının boya ve ağır metal iyonu giderimi üzerindeki etkileri araştırıldı. Farklı tuzların varlığında TFT adsorpsiyonunda değişiklik olmazken, Co (II) iyonunun adsospsiyonunda, katyonların rekabetinin etkisinden dolayı, belirgin düşüş gözlendi. İzoterm modellerinden Langmuir izoterm modelini takip eden adsopsiyon işleminin maksimum adsorplama kapasiteleri (qM) GO ve GO-EDTA üzerine sırasıyla; TFT boyası için 389,3178mg g-1 ve 1009,5300mg g-1, Co (II) iyonu için 736,9153mg g-1ve 1304,3525mg g-1‘dir (pH=7, t=150 min.,298 K).Kinetik veriler yalancı ikinci derece (PSO) modeline oldukça iyi uymaktadır. Partikül içi difüzyon ve Boyd'un modeline göre, adsorpsiyon kinetiği esas olarak sıvı film difüzyonu tarafından kontrol edildiği ve ayrıca partikül içi difüzyondan da etkilendiği belirlendi. Desorpsiyon grafiğinde, oldukça iyi TFT boya desorpsiyonu gözlemlenirken, Co (II) iyonunun desorpsiyonundaki düşüşün nedeni EDTA yapısında bulunan –COONa uçlarında iyon değişimi neticesinde oluşan bağın kuvvetli olmasıyla açıklanabilir. TFT boya molekülünde bulunan benzen halkaları ile GO ve GO-EDTA yapısında bulunan benzen halkalarının π-π etkileşimine girdiği, yapı üzerindeki fonksiyonel gruplarla hidrojen bağı yapması ve karboksilik asit uçlarında iyon değişimi neticesinde elektrostatik etkileşim yapması Co (II) ve TFT’nin adsorpsiyonunda etkili olmuştur. Sonuç olarak, GO ve GO-EDTA nanomalzemeleri sulu çözeltiden organik ve inorganik kirleticilerin arıtımı için geleneksel adsorbanların yerine, gelişmiş adsorbanlar olarak etkin bir şekilde uygulanabileceğini göstermektedir.

Anahtar Kelimeler

Grafen Oksit, N-[(3-Trimetoksisilil)propil]etilendiamin triasetik asit trisodyum (EDTA), Tioflavin T, Co (II), Adsorption, Nonlinear izoterm, Mekanizma

Kaynakça

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