Praseodymium katkılı titanyum dioksit fotokatalizörünün metilen mavisinin bozunma reaksiyonundaki etkinliği

Yıl 2020, Cilt: 35 Sayı: 2, 859 - 870, 25.12.2019

Doruk Doğu , Gürkan Karakaş

https://doi.org/10.17341/gazimmfd.549084

Cited By: 1

Öz

Bu çalışmada, sol-gel yöntemiyle hazırlanmış olan
titanium dioksit esaslı katalizörlere praseodymium (Pr) katkılanmasının ve
kalsinasyon sıcaklığının metilen mavisinin fotokatalitik bozunma
reaksiyonundaki etkileri araştırılmıştır. Titanyum dioksitin %1 oranında Pr
katkılanması anataz kristallerinin rutil yapısına dönüşmesini engelleyerek daha
kararlı bir anataz yapısının oluşmasını sağlamakta, yüzey alanını ve
fotokatalizörün ışık absorpsiyon kapasitesini artırmaktadır [1]. Metilen
mavisinin fotokatalitik bozunma reaksiyonunda Pr katkılanmasının yanısıra katalizörün
kalsinasyon sıcaklığının etkisi hem toz hem ince film katalizorler uzerinde etüd
edilmiştir. Deneysel sonuçlar, 600 °C’da kalsine edilen katalizörlerin 500 °C’da
kalsine edilen numunelere göre daha yüksek fotokatalitik aktiviteye sahip
olduklarını göstermiştir. Ayrica, Pr katkılanması toz halindeki TiO₂
katalizörlerin fotokatalitik performansını iyileştirmiş olup metilen mavisinin
tam dönüşmesini sağlamıştır.  Metilen
mavisi moleküllerinin dimerizasyonu da bozunma reaksiyon hızını etkilemekte olup
Pr katkilanmis numunelerde dimerlerin monomere dönüşümünün daha hızlı
gercekleştigi görülmüşür.

Anahtar Kelimeler

Titanyum dioksit, praseodim, fotokatalizör, metilen mavisi, dimerizasyon

Kaynakça

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