Removal of coomassie brilliant blue G-250 from aqueous solutions by anion-exchange resin

Öz

In this study, the removal of the toxic dye Coomassie Brilliant Blue G-250 (CBB) from aqueous solutions was investigated using Purolite A420S, a strong base anion-exchange resin. Batch experiments were conducted to evaluate the effects of resin dosage, solution pH, contact time, initial dye concentration, and temperature on the ion-exchange performance. The optimum resin dosage was determined as 0.05 g per 25 mL solution, yielding a maximum removal efficiency of approximately 91%. The removal efficiency was found to be relatively insensitive to pH in the range of 5–9. Kinetic studies indicated rapid initial uptake followed by equilibrium after 240 min, and the experimental data were best described by the pseudo-second-order kinetic model. Equilibrium isotherm analysis showed that CBB sorption followed the Langmuir isotherm model, with a maximum sorption capacity of 5.17 mg/g. Thermodynamic parameters revealed that the sorption process is exothermic and accompanied by a decrease in entropy, indicating increased order at the solid–solution interface during ion exchange.

Anahtar Kelimeler

• Coomassie Brilliant Blue G-250
• ion exchange
• Purolite A420S
• anion-exchange resin
• dye removal

Anyon değiştirici reçine ile sulu çözeltilerden coomassie brilliant blue G-250’nin giderimi

Öz

Bu çalışmada; kuvvetli bazik anyon değiştirici olan Purolite A420S kullanılarak sulardan Coomassie Brilliant Blue G-250 (CBB) giderimi incelenmiştir. Sulardan CBB giderimine; optimum reçine miktarı , çözelti pH`ı, temas süresi, derişim ve sıcaklığın etkisi incelenmiştir. Yapılan deneysel çalışmalar sonucunda optimum reçine miktarı 0,05 g/25 mL çözelti olarak bulunmuştur. CBB giderimi için optimum çalışma pH aralığı, 5–9 olarak belirlenmiştir. Gerçekleştirilen kinetik çalışmalarda, Purolite A420S reçinesi yaklaşık 240 dakika sonunda CBB’nin %91’ini gidermiştir. Yapılan denge izoterm çalışmaları, CBB gideriminin Langmuir izoterm modeline uygunluk gösterdiğini ortaya koymuştur. Termodinamik çalışmalar, sorpsiyon sürecinin ekzotermik olduğunu ve iyon değişimi sırasında katı–çözelti ara yüzeyinde düzensizliğin azaldığını göstermiştir.

Anahtar Kelimeler

• Coomassie Brilliant Blue G-250
• iyon değişimi
• anyon değiştirici reçine
• Purolite A420S
• boya giderimi

Kaynakça

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