Degradation of Fenoprofen Using Activated Carbon Supported Cobalt-Based Catalyst for Heterogeneous Activation of Persulfate

Öz

This study aims to investigate the degradation of fenoprofen (FNP) by heterogeneous activation of persulfate (PS) with the activated carbon supported cobalt-based catalyst (Co-AC). The effects of PS concentration, Co-AC dosage, initial pH, and anions on FNP degradation were investigated. FNP was completely degraded and mineralized under optimum operating conditions of 120 min contact time, 0.75 g/L Co-AC, 2 mM PS, natural pH and 25 °C. FNP degradation was found to best fit the pseudo-first order kinetic model. With quenching studies using certain alcohols, the reactive oxygen species effective in degradation were determined and SO4•− was found to be the dominant radical. In addition, the presence of NO3−, SO42− and PO43− anions were found to inhibit FNP degradation. These results indicate that the Co-AC/PS system is a promising and effective process for the degradation of FNP from aquatic environments.

Persülfatın Heterojen Aktivasyonu için Aktif Karbon Destekli Kobalt-Bazlı Katalizör Kullanılarak Fenoprofenin Degradasyonu

Öz

Bu çalışma aktif karbon destekli kobalt-bazlı katalizör (Co-AC) ile persülfatın (PS) heterojen aktivasyonu yoluyla fenoprofenin (FNP) degradsyonununu araştırmayı amaçlamaktadır. FNP degradasyonuna PS konsantrasyonu, Co-AC dozajı, başlangıç pH’sı, ve anyonların etkileri incelenmiştir. 120 dk temas süresi, 0.75 g/L Co-AC, 2 mM PS, doğal pH ve 25 °C optimum işletme koşullarında FNP’nin tam degradasyonu ve mineralizasyonu sağlanmıştır. FNP degradasyonunun pseudo-birinci dereceden kinetik modele en iyi uyduğu bulunmuştur. Belirli alkoller kullanılarak geçekleştirilen söndürme çalışmaları ile degradasyonda etkili reaktif oksijen türleri tespit edilmiştir ve SO4•−‘ün dominant radikal olduğu bulunmuştur. İlaveten, NO3−, SO42− ve PO43− anyonlarının varlığının FNP degradasyonunu inhibe ettiği belirlenmiştir. Elde edilen bu sonuçlar sucul ortamlardan FNP degradasyonu için Co-AC/PS sisteminin umut vaat eden etkili bir proses olduğunu göstermektedir.

Anahtar Kelimeler

• fenoprofen
• cobalt
• aktif karbon
• sülfat radikali
• degradasyon
• heterojen katalizör

Kaynakça

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