Bir Kesikli Sistemde Posidonia oceanica (L.) Deniz Çayırları Kullanılarak Hg2+’nin Sulu Çözeltiden Biyosorpsiyonu: Denge ve Kinetik Modelleme

Bu çalışmada, bir Akdeniz lignoselülozik biyokütlesi olan ham deniz çayırı Posidonia oceanica lifleri kullanılaraksulu çözeltiden Hg2+ uzaklaştırılması için kesikli sistem çalışmaları yapıldı. 25°C'de bir seri deneysel çalışma ilebiyosorpsiyon üzerine pH ve temas süresi etkisi araştırıldı. Hg2+nın uzaklaştırılmasının ilk aşamada (40 dk) çokhızlı olduğu ve optimum biyosorpsiyon kapasitesinin çözeltinin pH’sı 6 iken gerçekleştiği görüldü. Biyosorbanınfonksiyonel gruplarını ve yüzey özelliklerini karakterize etmek için Fourier Dönüşümlü Kızılötesi ve EnerjiDağılımı Spektroskopi teknikleri ile Taramalı Elektron Mikroskobu kullanıldı. Denge verileri Langmuir veFreundlich modelleri tarafından tanımlandı. Yalancı ikinci dereceden kinetik modelin tüm veriler için uygunolduğu bulundu. Ayrıca bu çalışma; Hg2+nın Posidonia oceanica üzerine biyosorpsiyonun, deniz ekosistemindekiciva (II) aktarımını anlamada önemli olduğunu gösterdi.

Biosorption of Hg2+ From Aqueous Solutions by Posidonia oceanica (L.) Seagrass in a Batch System: Equilibrium and Kinetic Modeling

In this study, batch experiments were carried out for the removal of Hg2+ from aqueous solution while raw seagrass Posidonia oceanica fibers, a Mediterranean marine lignocellulosic biomass, was used a biosorbent. Solution pH and contact time were investigated on biosorption in a series of batch experimental studies at 25 ºC. It was found that the removal of Hg2+ was very fast, during the first (40 minutes) and optimal biosorption capacity was at pH 6 of the solution. Fourier transformer infrared and Scanning Electron Microscopy with Energy Dispersive Spectroscopy techniques were used to characterize the functional groups and surface properties of biosorbent. The equilibrium data were described by Langmuir and Freundlich models. It was found that the pseudo-second-order kinetic model was suitable for all the data. Also this study shows that biosorption of Hg2+ on Posidonia oceanica is significance for understanding mercury (II) transference in the marine ecosystem.

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