Funda AK AZEM, Işıl BİRLİK, Özgür Yasin KESKİN, Tülay KOÇ DELİCE

Ametal Katkılama ile Titanyum Dioksit Nanomalzemelerin Fotokatalitik Bozunmasının İyileştirilmesi

Yarı iletken fotokataliz, kimyasal reaksiyonları başlatmak için güneş ışığından yararlanan bir süreçtir. Yarı iletkenlerin fotokatalitik özelliklerinden faydalanmak ve daha iyi performans elde etmek için yapısal düzenlemeye gereksinim duyulmaktadır. Bu çalışmada, sol-jel yöntemi kullanılarak TiO2 nanoyapılarını değiştirmek için değişen miktarlarda nitrojen kullanılmıştır. Sentezlenen TiO2 nanoyapıların kristal yapıları X-ışını kırınımı (XRD) yöntemiyle incelenmiştir. Nanomalzemelerin elemental bileşimini analiz etmek için X-ışını fotoelektron spektroskopisi (XPS) yapılmıştır. XPS analizi, nitrojenin TiO2 kafesindeki varlığını doğrulamaktadır. Metilen mavisinin (MB) UV ışıması altında fotokatalitik bozunması, numunelerin fotokatalitik performansını değerlendirmek için kullanılmıştır. Bozulmayı değerlendirmek için, MB'nin 664 nm'de zaman içinde absorpsiyonu bir UV-Vis spektrofotometre kullanılarak ölçülmüştür. Sonuç olarak, katkılama işleminin TiO2’nin fotokatalitik performansını iyileştirdiği ve %0,2 N katkılı TiO2 nanoyapıların MB'nin fotokatalitik bozunmasında üstün fotokatalitik aktivite gösterdiği bulunmuştur.

Anahtar Kelimeler:

TiO2; Sol-jel, Katkılama, Ametal, Fotokatalitik aktivite

Improvement of Photocatalytic Degradation of Titanium Dioxide Nanomaterials by Non-metal Doping

Semiconductor photocatalysis is a process that benefits from sunlight to start chemical reactions. In order to take advantage photocatalytic properties of semiconductors and to achieve better performance structural adjustment is needed. In this study, varying amounts of nitrogen were used to modify TiO2 nanostructures using the sol-gel method. The crystalline structure of the synthesized TiO2 nanostructures was studied using the X-ray diffraction (XRD) technique. X-ray photoelectron spectroscopy (XPS) was conducted to analyse the elemental composition of nanomaterials. XPS analyze confirms that nitrogen is introduced into the lattice of TiO2. The photocatalytic degradation of methylene blue (MB) under UV irradiation was employed to assess the photocatalytic performance of the samples. To evaluate degradation, the absorption of MB over time was measured using a UV-Vis spectrophotometer. As a result, the doping process has been found to improve the photocatalytic performance of TiO2, and 0.2% N doped TiO2 nanostructures demonstrated superior photocatalytic activity for photocatalytic degradation of MB.

Keywords:

TiO2; Sol-gel, Doping, Non-metal, Photocatalytic activity,

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