AYLİN ALTINIŞIK TAĞAÇ, MEHMET KADİR YURDAKOÇ

SULU ÇÖZELTİDEKİ REMAZOL MAVİSİ (RB) 'NIN KİTOSAN / SEP BİYOKOMPOZİTİ ÜZERİNE ADSORPSİYONU

Bu çalışmada, kitosan/sepiyolit (CS/SEP) biyokompozitleri hazırlanmıştır. SEP mineralinin molar oranlarının farklanmasının, boya çözeltisinin başlangıç pH değerinin ve sıcaklığın Remazol mavisinin (RB) sulu çözeltiden SEP üzerindeki adsorpsiyonu üzerine olan etkileri incelenmiştir. Adsorpsiyon kapasitesini belirlemek için, adsorpsiyon verileri Langmuir ve Freundlich eşitlikleri kullanılarak analiz edilmiştir. Langmuir eşitliği, Freundlich eşitliğinden daha yüksek uygunluk göstermiştir. Anyonik yapıdaki Remazol mavisinin kitosan biyokompoziti üzerindeki tutunması yapıdaki sepiyolit miktarına göre farklanmaktadır. Negatif yüklü sepiyolit minerali oranı arttıkça adsorpsiyon kapasitesi beklendiği gibi azalmaktadır ve adsorpsiyon kapasitesi SEP1, SEP2 ve SEP5 için 318 K de sırasıyla, 256, 126 ve 23 mg/g olarak belirlenmiştir. %99 RB uzaklaştırılmasına optimum değer olan pH 5’ te ulaşılmıştır. Kinetik deneylerden, adsorpsiyon sürecinin yalancı-ikincimertebe kinetik modeline uygunluk gösterdiği elde edilmiştir. Termodinamik hesaplamalar sonucunda entalpi ve aktivasyon enerjisi belirlenmiştir. Kitosan biyokompozitinin düşük pH değerlerinde adsorbent olarak kullanılabilir olduğu bulunmuştur. sonuçlarına göre fiziksel adsorpsiyon olduğu

Anahtar Kelimeler:

Adsorpsiyon, Kitosan, Sepiyolit, Biyokomposit

ADSORPTION OF REMAZOL BLUE (Rb) ONTO THE CHITOSAN/SEP BIOCOMPOSITE FROM AQUEOUS SOLUTION

In this study, chitosan/sepiolite (CS/SEP) biocomposites were prepared. The effects of molar ratios of CS and SEP, initial pH and temperature on the adsorption capacities of the biocomposites have been investigated. In order to determine the adsorption capacities of the sorbents, the sorption data were analyzed by using Langmuir and Freundlich equations. Langmuir equation showed higher conformity than Freundlich equation. The adsorption of Remazol Blue which has an anionic structure on biocomposite of chitosan changes with the amounts of sepiolite on the biosorbent. As the ratio of negatively charged sepiolite increases, as expected, the adsorption capacity decreases. The adsorption capacities of biocomposites were determined as 256, 126 and 23 mg/g at 318 K for SEP1, SEP2 and SEP5, respectively. The removal of RB was reached to 99% at the optimum pH of 5. From kinetic experiments, it was observed that the sorption process followed the pseudo-second-order kinetic model. According to thermodynamic calculations, the adsorption nature is determined by the results of enthalpy and activation energy as physical activation. It was found that chitosan biocomposites can be used as adsorbents at relatively low pH values

Keywords:

Adsorption, Chitosan, Sepiolite, Biocomposite,

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