Production of Titanium Dioxide/Reduced Graphene Oxide Composites and Investigation of Their Photocatalytic Properties

Öz

In this study, titanium dioxide/reduced graphene oxide (TiO2/rGO) composites were synthesized by sol-gel method. Reduced graphene oxide was obtained with the aid of chemical reduction of graphene oxide (GO) produced by the Hummers method. TiO2/rGO composites were produced with different rGO content, 0.5, 1, 2, 4 and 6 wt. %, to investigate the effect of rGO addition on structural, morphological and photocatalytical properties. In addition, the pure TiO2 was also produced for comparison with all TiO2/rGO composites. The crystal phase structure, surface morphology, and chemical bond structure of TiO2/rGO composites were characterized using an XRD, SEM, and FTIR. Absorbance values were obtained by UV-Vis spectroscopy to determine the photocatalytic performance. As a result of the investigation of photocatalytic properties, it was observed that the composite containing 4 wt. % of rGO has a photocatalytic degradation efficiency of 87.1%. This study demonstrated that the TiO2/rGO composite obtained by the addition of 4 wt. % of rGO to TiO2 enhanced the photocatalytic performance by 20% compared to pure TiO2.

Anahtar Kelimeler

• Titanium dioxide,reduced graphene oxide,photocatalysis,composite,sol-gel

Titanyum Dioksit/İndirgenmiş Grafen Oksit Kompozitlerin Üretimi ve Fotokatalitik Özelliklerinin İncelenmesi

Öz

Bu çalışmada, titanyum dioksit/indirgenmiş grafen oksit (TiO2/rGO) kompozitleri sol-jel yöntemi kullanılarak sentezlenmiştir. Hummers metodu ile üretilen grafen oksitten (GO) kimyasal indirgeme yardımıyla rGO elde edilmiştir. TiO2/rGO kompozitleri ağırlıkça % 0,5, 1, 2, 4, 6 oranlarında rGO içerecek şekilde üretilmiş olup rGO katkısının yapısal, morfolojik ve fotokatalitik özellikler üzerine etkisi araştırılmıştır. Buna ek olarak TiO2/rGO kompozitleri ile karşılaştırma yapabilmek için saf TiO2’de üretilmiştir. TiO2/rGO kompozitlerinin kristal faz yapısı, yüzey morfolojisi ve kimyasal bağ yapısı XRD, SEM ve FTIR kullanılarak karakterize edilmiştir. Fotokatalitik performansın belirlenmesi için Uv-Vis spektroskopisi kullanılarak absorbans değerleri elde edilmiştir. Fotokatalitik özelliklerinin incelenmesi sonucunda ağırlıkça % 4 rGO içeren kompozitin % 87,1’lik bir fotokatalitik parçalama verimine sahip olduğu görülmüştür. Bu çalışma, TiO2’ye ağırlıkça % 4’lük rGO eklenmesiyle elde edilen TiO2/rGO kompozitinin fotokatalitik performansı saf TiO2’ye kıyasla % 20 arttırdığını göstermiştir.

Anahtar Kelimeler

• Titanyum dioksit,indirgenmiş grafen oksit,fotokataliz,kompozit,sol-jel

Kaynakça

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