KATKILANDIRILMIŞ TiO2 FOTOKATALİZÖRLERİNİN HAZIRLANMASI VE GÜNEŞ IŞIĞI ALTINDA DEKOLORİZASYON VERİMLİLİKLERİ

Öz

Organik kirleticilerin sulu ortamda bozunmasında etkili olan fotokataliz yöntemi oldukça ilgi çekmektedir. Bu ileri oksidasyon yönteminin esası, hedef molekülün hidroksil radikalleri tarafından yükseltgenmesidir. En yaygın olarak tercih edilen ve güçlü fotokatalizör titanyum dioksittir (TiO2). Ancak bant boşluğu enerjisi nedeniyle güneş ışığı altında sınırlı kullanımı vardır. Bu durum, çeşitli olası uygulamalar için büyük bir dezavantajdır. Bu dezavantajın üstesinden gelmek için, fotokatalizörün bant boşluğunu daraltmak amacıyla metaller ve ametaller ile katkılandırma işlemi uygulanabilmektedir. Bu çalışmada, ıslak aşılama metodunu kullanarak simüle edilmiş solar ışıkta aktif olan fotokatalizörler hazırlanmıştır. Rodamin B ve Kongo Kırmısızı olmak üzere iki farklı boya sınıfının dekolorizasyonu (renginin giderilmesi) işlemi güneş ışığı altında katkılı TiO2 ile yapılmıştır. Ametal katkılı (C, N, Se), metal katkılı (Cu, Fe) ve ikili katkılı (N/S) TiO2 fotokatalizörlerin fotokatalitik performansları UV-vis verilerini takip ederek ve ortamdan uzaklaşma yüzdeleri hesaplanarak incelenmiştir.

Anahtar Kelimeler

• Kongo Kırmızısı
• Dekolorizasyon
• Katkılandırılmış TiO2
• Rodamin B
• Solar Fotokataliz

PREPARATION OF DOPED TiO2 PHOTOCATALYSTS AND THEIR DECOLORIZATION EFFICIENCIES UNDER SOLAR LIGHT

Öz

Photocatalysis has gained a great interest for the degradation of organic pollutants in aqueous media. This effective advanced oxidation technique is basically based on the oxidation of the target molecule by hydroxyl radicals. The most widely preferred and powerful photocatalyst is titanium dioxide (TiO2), but it has limited use under solar light because of its band gap energy. This is a major drawback for various possible applications. In order to overcome this disadvantage, doping the photocatalyst with metals and non-metals to narrow the band gap can be applied. In this work, we have prepared visible light active photocatalysts by using wet-impregnation method. Decolorization of two different classes of dyes, Rhodamine B and Congo Red, was carried out under simulated solar light with doped TiO2. The photocatalytic performances of non-metal doped (C, N, Se), metal doped (Cu, Fe) and codoped (N/S) TiO2 photocatalysts were investigated by UV-vis studies and removal percentage calculations.

Anahtar Kelimeler

• Congo Red
• Decolorization
• Doped TiO2
• rhodamine B
• Solar Photocatalysis

Teşekkür

Authors would like to express their gratitude to Professor Miray Bekbolet for allowing them to conduct photocatalytic experiments at the laboratories of Boğaziçi University, Institute of Environmental Sciences.

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