Sıfır Değerlikli Katalizör Varlığında Fenton Benzeri Prosesin Etkinliğinin Belirlenmesi: Reaktif Boyar Madde Degredasyonu

Öz

Bu çalışmada, azo grubu Reaktif Kırmızı 2 (RR2) boyasının sulu çözeltiden sıfır değerlikli demir varlığında Fenton benzeri bir işlemle renk ve Kimyasal Oksijen İhtiyacı (KOİ) parametrelerine göre giderilebilirliği araştırılmıştır. pH, sıfır değerlikli demir ve hidrojen peroksit (H2O2) konsantrasyonlarının renk ve KOİ giderimi üzerindeki etkileri araştırılmıştır. Optimum renk ve KOİ giderimi koşulları pH 3, ZVI = 0,1 g/L ve H2O2 = 150 mg/L olarak belirlenmiştir. Optimum koşullar altında, başlangıç RR2 değerleri 10, 30, 50, 70, 100, 150 ve 200 mg/L olduğunda, renk giderimi %100 ile %95 arasında, KOİ giderimi ise %97,98 ile %65,67 arasında değişmiştir. RR2 konsantrasyonundaki artış, özellikle KOİ giderimi üzerinde olumsuz bir etkiye sahiptir. Kinetik değerlendirmeler, renk ve COD giderimi için en uygun proses koşulları altında, 20 °C sabit sıcaklıkta farklı boya konsantrasyonlarında prosesin zamanla verimliliğini inceleyerek yapılmıştır. Renk ve KOİ giderimi sonuçlarına sözde birinci derece, sözde ikinci derece ve Behnajady-Modirshahla-Ghanbery kinetik modelleri uygulanmıştır. 100, 150, 200 mg/L RR2 konsantrasyonlarında, BMG modelinde renk için belirleme katsayısı 0,9984-1 aralığında hesaplanırken, COD için 0,9935-0,9987 aralığında belirlenmiştir. Kinetik hesaplamaların sonuçları, Fenton benzeri reaksiyonun Behnajady-Modirshahla-Ghanbery modeline uyduğunu göstermiştir. Bu süreç, ucuz, kolay erişilebilir ve çevre dostu olması nedeniyle, özellikle renk giderimi için uygulanabilir bir ileri oksidasyon süreci olarak değerlendirilebilir.

Anahtar Kelimeler

• Fenton benzeri proses
• İleri oksidasyon prosesleri
• Reaktif boyar madde
• Reaksiyon kinetikleri
• Sıfır değerlikli demir

Determination of the Efficiency of Fenton-Like Process in the Presence of Zero-Valent Catalyst: Reactive Dye Degradation

Öz

In this study, the removability of azo group Reactive Red 2 (RR2) dye from aqueous solution was investigated in the presence of zero-valent iron with a Fenton-like process based on color and Chemical Oxygen Demand (COD) parameters. The effects of pH, zero-valent iron, and hydrogen peroxide (H2O2) concentrations on color and COD removal were investigated. The optimum color and COD removal conditions were determined as pH 3, ZVI = 0.1g/L, and H2O2 = 150mg/L. Under optimum conditions, at initial RR2 values of 10, 30, 50, 70, 100, 150, and 200 mg/L, color removal ranged from 100% to 95%, and COD removal ranged from 97.98% to 65.67%. The increase in RR2 concentration has a negative effect, mainly on COD removal. Kinetic evaluations were made by examining the efficiency of the process against time at different dyestuff concentrations at a constant temperature of 20οC under the most suitable process conditions for both color and COD removal. Pseudo-first-order, pseudo-second-order, and Behnajady-Modirshahla-Ghanbery kinetic models were applied to the color and COD removal results. At concentrations of 100, 150, 200 mg/L RR2, in the BMG model, the coefficient of determination for color was calculated in the range of 0.9984-1, while for COD it was determined in the range of 0.9935-0.9987. The results from kinetic calculations showed that the Fenton-like reaction fits the Behnajady-Modirshahla-Ghanbery model. This process can be considered a feasible advanced oxidation process, particularly for color removal, as it is inexpensive, easily accessible, and environmentally friendly.

Anahtar Kelimeler

• Advanced oxidation processes
• Fenton-like process
• Zero valent iron
• Reactive dye

Kaynakça

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