Pamukkale Univ Muh Bilim Derg. Ahead of Print: PAJES-17124

Adsorption of Telon Blue Dye from Aqueous Solutions Using Pine Cone Powder: Isotherm, Kinetic Models and Heat of Adsorption

Melike Ýþgören
Kocaeli University, Ýzmit Vocational School, Department of Environmental Protection, Kocaeli

This study investigates the removal of Telon Blue (TB) dye from aqueous solutions using powder of tree cone stalks (KST), which is readily available in nature. The factors affecting TB removal, including pH (3-11), amount of adsorbent (3-10 g/L), stirring speed (50-250 rpm), contact time (5-90 min), initial dye concentration (25-400 mg/L), and temperature (25-55°C), were examined. The pHpzc value of KST was determined using the pH drift method to evaluate the effect of pH on the adsorption process and found as 5,4. The 87.6% of maximum efficiency for dye removal was achieved under the following conditions: pH 3, 5 g/L of adsorbent, 200 rpm stirring speed, 10 minutes of contact time, and a temperature of 25°C. To comprehend the adsorption mechanism, kinetic and isothermal models were applied and found to be more compatible with the pseudo-second-order(R2=0.99) kinetic and Temkin (R2=0.99) isothermal models. The thermodynamic studies revealed that the adsorption process is exothermic, as indicated by the negative value of ΔH°. It has been proven through experiments that KST absorbs TB from the dye mixture with high ratio. The study revealed that KST is an effective and highly reusable adsorbent in removing TB dye from aqueous solutions.

Keywords: Adsorption, tree cone stalk, adsorption kinetics, adsorption isotherms, adsorption thermodynamics, point of zero charge.

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Kozalak Sapý Tozu Kullanarak Sulu Çözeltilerden Telon Blue Boyasý Adsorpsiyonu: Ýzoterm, Kinetik Modelleri ve Adsorpsiyon Isýsý

Melike Ýþgören
Kocaeli Üniversitesi, Ýzmit Meslek Yüksekokulu, Çevre Koruma Kontrol Programý, Kocaeli

Bu çalýþmada, doðada kolayca bulunabilen aðaç kozalak saplarýnýn tozu (KST) kullanýlarak sulu çözeltilerden Telon Blue (TB) boyasý giderimi araþtýrýlmýþtýr. TB giderimini etkileyen faktörleri belirleyebilmek için pH (3-11), kozalak miktarý (3-10 g/L), karýþtýrma hýzý (50-250 rpm), temas süresi (5-90 dak), baþlangýç boya konsantrasyonu (25-400 mg/L) ve sýcaklýk (25-55°C) parametreleri incelenmiþtir. Adsorpsiyon prosesi üzerine pH etkisinin deðerlendirilebilmesi için KST ye ait izoelektrik nokta tayini (pHpzc) deðeri pH drift metodu kullanýlarak, 5.4 olarak bulunmuþtur. Deneysel çalýþmalar sonunda %87.6’lýk maksimum boya giderim verimi pH 3’te, 5 g/L adsorbent dozu, 200 rpm karýþtýrma hýzý, 10 dakika temas süresi ve 25° sýcaklýk deðerlerinde elde edilmiþtir. Adsorpsiyon mekanizmasýnýn anlaþýlabilmesi için kinetik ve izoterm modelleri ile incelenmiþ sözde ikinci derece kinetik (R2=0.99) ve Temkin izoterm modellerine (R2=0.97) daha uyumlu olduðu görülmüþtür. Termodinamik çalýþmalar sonucunda ΔH°'nin negatif deðeri adsorpsiyon prosesinin ekzotermik olduðunu göstermektedir. KST’nin boya karýþýmýndan TB’yi yüksek oranda adsorpladýðý yapýlan deney ile kanýtlanmýþtýr. Çalýþma, KST'nin TB boyasýný sulu çözeltilerden uzaklaþtýrmada etkili ve tekrar kullanýlabilirliði yüksek bir adsorbent olduðunu ortaya koymuþtur.

Anahtar Kelimeler: Adsorpsiyon, kozalak sapý, adsorpsiyon kinetiði, adsorpsiyon izotermleri, adsorpsiyon termodinamiði, izoelektrik nokta.

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