Adsorption of Alizarin Red S from Solution on Silicagel: Equilibrium Isotherms and Kinetic Investigations

Abstract

In this study, the adsorption of alizarin red S from solution on silica gel was investigated. The effects of factors such as pH, adsorbent concentration and contact time on the adsorption behavior of alizarin red S dyestuff were investigated. The adsorption kinetics of alizarin red S with 20 mg adsorbent and 20 mg/L adsorbate solutions at 25 ºC were investigated using two kinetic models: pseudo-first-order and pseudo-second-order models. The experiments were carried out at constant pH = 7 and 40 ºC to determine the relationship between adsorption and temperature. Based on experimental data, kinetic parameters and correlation coefficients were determined. Equilibrium isotherms for the adsorption of alizarin on red S were measured experimentally. The compatibility of the experimental data with the isotherms of Langmuir, Freundlich, DKR, BET and Temkin was investigated. Characteristic parameters of each isotherm are determined. The results showed that the event is an exothermic and spontaneous physical adsorption.

Keywords

• Adsorption
• Alizarin Red S
• Isotherm
• Kinetics
• Silicagel

Alizarin Red S’in Silika Jel Üzerindeki Çözeltiden Adsorpsiyonu: Denge İzotermleri ve Kinetik İncelemeler

Öz

Bu çalışmada, alizarin red S’in silika jel üzerine çözeltiden adsorpsiyonu araştırılmıştır. pH, adsorbent konsantrasyonu ve temas süresi gibi etkenlerin alizarin red S boyar maddesinin adsorpsiyon davranışı üzerindeki etkisi incelenmiştir. 25 0C sıcaklıkta, 20 mg adsorban ve 20 mg/L adsorbat çözeltilerle alizarin red S’in adsorpsiyon kinetiği, yalancı birinci mertebeden ve yalancı ikinci mertebeden modelleri olmak üzere iki kinetik model kullanılarak araştırılmıştır. Adsorpsiyonun sıcaklıkla ilişkisini saptamak için sabit pH = 7’de ve 40 0C sıcaklıkta denemeler yapılmıştır. Deneysel verilerden hareketle kinetik parametreler ve korelasyon katsayıları belirlenmiştir. Alizarin red S’in üzerine adsorpsiyonu için denge izotermleri deneysel olarak ölçülmüştür. Deneysel verilerin Langmuir, Freundlich, DKR, BET ve Temkin izotermlerine uyumluğu araştırılmıştır. Her izotermin karakteristik parametreleri belirlenmiştir. Sonuçlar, olayın ekzotermik ve kendiliğinden yürüyen fiziksel bir adsorpsiyon olduğunu göstermiştir.

Anahtar Kelimeler

• Adsorpsiyon
• , Alizarin Red S,
• izoterm, Kinetik ve Silikajel

Kaynakça

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