Kitosan/Poli(vinil alkol)/ TiO2/Bor Nanokompozitlerinin Fotokatalitik Aktivitesinin İncelenmesi

Bu çalışmada, kitosan/poli vinil alkol/TiO2/bor nanokompozitleri (CS/P/TiB) sentezlenmiş ve non-steroidal anti-inflamatuar ilaç (ibuprofen (IBP)) fotokatalitik giderim performansları ilk kez incelenmiştir. Nanakompozitler; taramalı elektron mikroskobu (SEM), X-ray fotoelektron spektroskopisi (XPS), Fourier Dönüşümlü Kızılötesi (FTIR) Spektroskopisi ve termogravimetrik analiz (TG-DTG) ile karakterize edilmiştir. TGA termogram sonuçlarına göre, Ti-B içeriği arttıkça nanokompozitlerin termal kararlılığının arttığı gözlenmiştir. Fotokatalitik çalışmalarda yapıdaki Ti-B içeriği, katalizör dozu ve başlangıç konsantrasyon etkisi incelenmiş ve uygun bir fotobozunma prosesi tartışılmıştır. Ti-B oranı arttıkça IBP fotokatalitik bozunma oranı artmış ve kinetik hız sabiti 4.516 × 10−2 dak-1’(saf Ti-B için) değerinden 5.346 × 10−2 dak-1 (CS/P/Ti-B/1 için) değerine yükselmiştir. Bu artış, ışın altında uyarılmış elektron boşluk çiftlerinin düşük rekombinasyon hızından kaynaklanmaktadır.

Investigation of Photocatalytic Activity of Chitosan/Poly(vinyl alcohol)/TiO2/Boron Nanocomposites

In the current work, A series of chitosan/poly(vinyl alcohol)/TiO2/boron nanocomposites (CS/P/Ti-B) were prepared and their activity in the photocatalytic removal of non-steroidal anti-inflammatory drug (ibuprofen (IBP)) were evaluated for the first time. The nanocomposites were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectrum (FT-IR), and thermogravimetric analysis (TG-DTG). TGA thermograms showed the enhanced thermal stability of nanocomposites with increasing Ti-B content. In the photocatalytic experiments, the effects of Ti-B content, catalyst dosage and initial concentration were discussed and a suitable photodegradation process for enhanced removal was proposed. The photocatalytic removal of IBP increased with increasing Ti-B ratio and the kinetic rate constant of Ti-B increased from 4.516 × 10−2 min-1 (for raw Ti-B) to 5.346 × 10−2 min-1 (for CS/P/Ti-B/1). This increment could be attributed to the decreased recombination rate of the photogenerated electron-hole pairs.

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