Kimyasal Çöktürme Yöntemiyle Persülfat Aktivasyonu için Aktif Karbon Destekli Demir ve Kobalt Bazlı Katalizör Sentezi ve Eritromisin Degradasyonu için Uygulaması

Kalıcı organik kirleticilerin sucul ortamlardan ileri oksidasyon yöntemleriyle giderimi için etkili, ekonomik ve çevre dostu heterojen katalizörlerin geliştirilmesi son zamanlarda oldukça önem kazanmıştır. Bu çalışmada, aktif karbon (AC) destekli demir (CP-Fe) ve kobalt (CP-Co) bazlı katalizörler kimyasal çöktürme yöntemiyle hazırlanmıştır. Hazırlanan katalizörler FTIR, FESEM, EDX-haritalama, XRD, pHpzc, Boehm titrasyonu ve BET yüzey alanı teknikleri kullanılarak karakterize edilmiştir. AC destekli CP-Fe ve CP-Co katalizörlerin spesifik yüzey alanlarının sırasıyla 396.42 ve 441.76 m2/g olduğu ve her iki katalizörün de mezo gözenekli bir yapıya sahip olduğu belirlenmiştir. Demir ve kobaltın AC yüzeyine homojen bir şekilde yayılmış olduğu, demirin manyetit (Fe3O4) ve kobaltın ise amorf yapıda olduğu tespit edilmiştir. Katalizörlerin katalitik aktiviteleri, persülfat aktivasyonu ile eritromisin (ERY) degradasyonunda test edilmiştir. CP-Fe katalizör varlığında ERY 60 dk’da %96 oranında degrede olurken, CP-Co katalizör varlığında 30 dk içinde tamamen degrede olmuştur. Her iki katalizörün de adsorpsiyon ve degradasyonun birlikte sinerjik etkisiyle ERY’yi parçalamada ve gidermede yüksek katalitik aktivite gösterdiği belirlenmiştir.

Anahtar Kelimeler:

Aktif karbon, Destek materyali, Katalizör sentezi, İleri oksidasyon, Bozunma, Kalıcı organik kirletici

Synthesis of Activated Carbon-Supported Iron and Cobalt Based Catalysts by Chemical Precipitation Route for Persulfate Activation and Its Application for Erythromycin Degradation

The development of efficient, economical and environmentally friendly heterogeneous catalysts for the removal of persistent organic pollutants from aquatic environments has recently become important. In this study, the activated carbon (AC) supported iron (CP-Fe) and cobalt (CP-Co) based catalysts were successfully prepared by the chemical precipitation method. The prepared catalysts were characterized using FTIR, FESEM, EDX-mapping, XRD, pHpzc, Boehm titration and BET surface area. It was determined that the specific surface areas of CP-Fe and CP-Co catalysts were 396.42 and 441.76 m2/g, respectively, and both catalysts had a mesoporous structure. SEM-EDX and XRD analysis showed that the iron and cobalt were uniformly dispersed on the AC support surface and iron in the structure was in the form of magnetite (Fe3O4) and the cobalt was in the amorphous form. The catalytic activities of the catalysts were evaluated for degradation of erythromycin (ERY) by persulfate activation. While 96% of ERY was decomposed for 60 min in the presence of CP-Fe catalyst, it was completely decomposed within 30 min in the presence of CP-Co catalyst. It was determined that both catalysts showed high catalytic activity for ERY removal with the synergistic effect of adsorption and degradation.

Keywords:

Activated carbon, Supporting material, Catalyst synthesis, Advanced oxidation, Degradation, Persistent organic pollutant,

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