Elaeagnus angustifolia STONE AS A LOW-COST BIOSORBENT PRECURSOR FOR REMOVAL OF METHYLENE BLUE FROM AQUEOUS SOLUTION

Yıl 2012, Cilt: 13 Sayı: 1, 13 - 21, 24.08.2012

Murat Kılıç Zakir Poyraz

Öz

In this study, the removal of methylene blue from aqueous solutions by biosorption onto Elaeagnus angustifolia stone has investigated. Optimum biosorption conditions have determined as a function of pH, biosorbent dosage, initial methylene blue concentration, contact time and temperature of the solution for the removal of methylene blue. Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherm models have used to describe the biosorption isotherm model. The experimental data have fitted to pseudo-first order, pseudo-second order and intraparticle diffusion model to examine the sorption kinetics. The values of ΔG°, ΔH° and ΔS° have calculated by thermodynamic study to determine the nature of biosorption process. Experimental results have shown that Elaeagnus angustifolia stone can be used as an effective and low cost biosorbent precursor for the removal of methylene blue from aqueous solutions.  

 

Anahtar Kelimeler

Biosorption, methylene blue, biomass, Elaeagnus angustifolia

Uygulamalı Bilimler ve Mühendislik

Öz

Bu çalışmada, biyosorpsiyon ile sulu çözeltilerden metilen mavisinin Elaeagnus angustifolia çekirdeği ile giderimi araştırılmıştır. Optimum biyosorpisyon koşulları pH, biyosorban miktarı, başlangıç metilen mavisi derişimi, temas süresi ve sıcaklığın fonksiyonu olarak belirlenmiştir. Biyosorpsiyon izoterm modelinin belirlenmesi amacıyla Langmuir, Freundlich ve Dubinin-Radushkevich (D-R) izoterm modelleri kullanılmıştır. Deneysel veriler sözde-birinci dereceden, sözde-ikinci dereceden ve partikül içi difüzyon modellerine uygulanarak giderim işleminin kinetik ifadeleri belirlenmiştir. Biyosorpsiyon işleminin doğasını incelemek için ise ∆G°, ∆H° ve ∆S° değerleri hesaplanmıştır. Deneysel sonuçlar, sulu çözeltilerden biyosorpsiyon ile metilen mavisinin gideriminde Elaeagnus angustifolia çekirdeğinin etkili ve ucuz bir biyosorban kaynağı olarak kullanılabileceğini göstermiştir

Anahtar Kelimeler

Biyosorpsiyon, Metilen mavisi, Biyokütle, Elaeagnus angustifolia

Kaynakça

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