Görünür Işık Altında İndigo Karminin Fotodegradasyonunu Artırmak için CaTiO3/g-C3N4 Heteroyapısının Sentezlenmesi

Öz

Bir seri grafit karbon nitrür (CN) modifiye CaTiO3 (CTO) kompoziti sentezlendi ve bu malzemeler indigo karmin (IC) fotodegradasyonunda kullanıldı. CTO/CN(III) heteroyapısı, görünür ışık ışıması altında en yüksek fotokatalitik IC bozunma performansı sergiledi. CTO/CN(III) fotokatalizörü varlığında IC’in bazunma hız sabiti CN’in 1.69 ve CTO’nun 10.50 katıdır. Bu iyi aktivitenin sebebi foto-uyarılmış taşıyıcıların daha kolay ayrılması olabilir. Katalizör miktarı, boyar maddenin giderimi üzerinde olumlu bir etki gösterirken; başlangıç boyar madde konsantrasyonu bu giderimi azaltmaktadır. Diğer yandan, bu katalizör asidik ortamda çok daha iyi performans göstermektedir. Radikal tutucu çalışmaları sonucunda, indigo karminin bozunması üzerinde süper oksit radikalinin büyük rol oynadığı gözlenmiştir. Ayrıca, bu deneylerin sonuçları baz alınarak IC’in bozunma reaksiyon mekanizması önerilmiştir. Ek olarak, bu optimum kompozit, iyon içeren su kütlelerinde, yani musluk ve içme sularında önemli performans göstermişlerdir. Bu çalışmada, kalsiyum bazlı perovskit ile modifiye edilmiş grafit karbon nitrür boya giderimi için umut verici ve kararlı bir fotokatalizör olarak sunulmuştur.

Anahtar Kelimeler

• CaTiO3
• grafit karbon nitrür
• indigo karmin
• fotakatalizör

Construction of CaTiO3/g-C3N4 Heterostructure for Boosting Photodegradation of Indigo Carmine under Visible Light Illumination

Öz

A series of graphitic carbon nitride (CN) modified CaTiO3 (CTO) composites were synthesized and applied to photodegradation of indigo carmine (IC) The CTO/CN(III) heterostructure exhibited the highest photocatalytic performance for IC degradation under visible light irradiation. The degradation rate constants of IC by the optimal sample were 1.69 and 10.50 times that of CN and CTO, respectively. This could be attributed to the effective separation of photoexcited carriers easier. The photocatalyst dosage increased the removal efficiency, while the initial dye concentration negatively affected the IC degradation rate. Under acidic atmosphere, the catalyst showed superior degradation rate. Furthermore, the active substance (•O2 ¯) was the major active substance for IC photodegradation. On this basis, the possible photocatalytic reaction mechanism of CTO/CN(III) sample was proposed. In addition, the composite achieved considerable performance in ions-included water bodies, namely tap water and drinking water. This study provides a promising and stable photocatalyst as a graphitic carbon nitride modified with calcium-based perovskite for dye removal.

Anahtar Kelimeler

• CaTiO3
• graphitic carbon nitride
• indigo carmine
• photocatalyst

Kaynakça

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