Formation and Investigation of Photocatalytic Activities of TiO2/ZnO and TiO2/CuO Heterostructures on Nanostructured TiO2 Film Surfaces

Year 2019, Volume: 12 Issue: 1, 63 - 73, 24.03.2019

Tuncay Dikici , Metin Yurddaşkal

https://doi.org/10.18185/erzifbed.423082

Abstract

In this study, the photocatalytic performance of each different oxide compound was investigated in three different stages on pure titanium surface by forming TiO₂/ZnO and TiO₂/CuO structures. Firstly; nanocomposite TiO₂film structure was formed on pure titanium surface by electrochemical anodization technique. After this process, TiO₂film surfaces were coated with Zn and Cu by electrolytic method. Zn and Cu coated specimens were heat treated at 500 ^oC for 2 hours to form TiO₂/ZnO and TiO₂/CuO structures. The crystal structure and surface morphology of the prepared samples were analyzed by X-ray diffractometer and scanning electron microscope. Photocatalytic performance tests were performed with absorbance measurements obtained from the methylene blue solution kept under ultraviolet light at certain time intervals. As a result of the tests, it is understood that the TiO₂/ZnO sample has the best photocatalytic degradation performance and the reaction rate constant.

Nanoyapılı TiO2 Film Yüzeyinde TiO2/ZnO ve TiO2/CuO Heteroyapıların Oluşturulması ve Fotokatalitik Aktivitelerinin İncelenmesi

Abstract

Bu çalışmada, saf titanyum yüzeyinde üç farklı aşamada TiO₂/ZnO ve TiO₂/CuO heteroyapıları oluşturularak her bir farklı oksit bileşiğin fotokatalitik performansları incelenmiştir. İlk olarak; elektrokimyasal anotlama tekniği ile saf titanyum yüzeyinde nanoyapılı TiO₂film yapısı oluşturulmuştur. Bu işlemin sonrasında, TiO₂film yüzeylerine elektrolitik yöntemle Zn ve Cu kaplanmıştır. Zn ve Cu kaplanmış bu örnekler 500 ^oC’de 2 saat boyunca ısıl işleme tabi tutularak TiO₂/ZnO ve TiO₂/CuO yapılarının oluşumu sağlanmıştır. Hazırlanan örneklerin kristalin yapısı ve yüzey morfolojisi X ışını kırınım cihazı ve taramalı elektron mikroskobu ile analiz edilmiştir. Fotokatalitik performans testleri, belirli zaman aralıklarında ultraviyole ışık altında bekletilen metilen mavisi çözeltisinden alınan absorbans ölçümleri ile gerçekleştirilmiştir. Testlerin sonucunda en iyi fotokatalitik bozundurma performansına ve reaksiyon hız sabitine TiO₂/ZnO numunesinin sahip olduğu anlaşılmıştır.

Keywords

Fotokataliz, yüzey morfolojisi, anotlama, elektrolitik kaplama, nanoyapılar

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