Düşük Maliyetli Adsorbentler Üzerine Dispers Sarı 211 Tekstil Boyasının Adsorpsiyonu

Bu çalışmada, tekstil boyası Dispers Sarı 211'in ekonomik olarak üretilen aktif karbonlar üzerine adsorpsiyonu incelenmiştir. Aktif karbonlar kiraz çekirdeklerinden, kimyasal aktivasyon ajanı olarak NaOH ve KOH'in kullanıldığı kimyasal aktivasyonla üretilmişlerdir. Adsorpsiyon prosesi kesikli deneylerde, şu deneysel parametrelerle incelenmiştir: temas süresi, adsorbent miktarı, çözelti başlangıç pH'sı ve sıcaklık. Adsorbentlerin farklı pH'larda zeta potansiyel ölçümleri yapılmıştır. Ayrıca, adsorpsiyon prosesi için denge, kinetik ve termodinamik çalışmalar gerçekleştirilmiştir. Adsorpsiyon denge ölçümleri Langmuir, Freundlich ve Temkin izotermleri ile incelenmiş ve model parametreleri belirlenmiştir. DS 211 tekstil boyasının adsorpsiyonu için AK1 ve AK2 adsorbentlerinin adsorpsiyon kapasiteleri (Q0) sırasıyla 373.1 ve 305.8 mg/g olarak hesaplanmıştır. Her iki adsorbentle yapılan çalışmada, adsorpsiyonu en iyi ifade edebilen kinetik modelin yalancı ikinci derece kinetik model olduğu saptanmıştır. Hesaplanan termodinamik parametreler, adsorpsiyonun 30-50 °C aralığında kendiliğinden gerçekleşen endotermik bir proses olduğunu göstermektedir. Sonuç olarak mikrodalga yöntemiyle KOH ve NaOH ile kiraz çekirdeklerinden üretilen aktif karbonların sulu çözeltilerden DS 211 tekstil boyasını adsorpsiyonunda düşük maliyetli ve etkili bir adsorbent olarak kullanılabileceği belirlenmiştir

Adsorption of Textile Dye Dispers Yellow 211 onto Low Cost Adsorbents

In this study, adsorption of textile dye Dispers Yellow 211 on to economically produced activated carbons has been investigated. Activated carbons have been prepared from cherry stone by the chemical activation using NaOH and KOH as chemical activating agents. The adsorption process has been investigated in batch experiments with the following experimental parameters: contact time, amount of adsorbent, solution pH and temperature. Zeta potential measurements of adsorbents at different pHs were performed. Additionally, equilibrium, kinetic and thermodynamic studies were carried out for the DY 211 adsorption. Adsorption equilibrium measurements were treated with Langmuir, Freundlich and Temkin isotherm models and model parameters were determined. Adsorption capacity (Q0) of adsorbents AK1 and AK2 for DS 211 adsorption were found to be 373.1 and 305.8 mg/g, respectively. For both studied adsorbents, pseudo-second-order kinetic model was the best model to express the adsorption kinetics. Calculated thermodynamic parameters showed that, adsorption was a spontaneous endothermic process between 30 and 50 °C. As a result, activated carbon produced from cherry stones with microwave-induced activation by KOH and NaOH could be used as a low cost and effective adsorbent for the adsorption of disperse yellow 211 textile dye from aqueous solutions. © Afyon Kocatepe Üniversitesi

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