Production of ZnO- Graphene Nanocomposite by Sol-Gel Method and used as a Photocatalyst

Yıl 2018, Cilt: 33 Sayı: 3, 207 - 216, 30.09.2018

Ömer Güler , Veyis Selen , Hasan Safa Gülbeyi Dursun

https://doi.org/10.21605/cukurovaummfd.504684

Öz

In this study, production and partial photocatalytic properties of the Graphene-ZnO composites were investigated. Graphene nano layers used as reinforcement element in the composite were produced via liquid phase exfoliation method. These nano layers were added during the sol-gel process to ensure homogeneous mixing of ZnO with the graphene. In some regions, graphene layers were observed to be surrounded by ZnO particles. Characterization of the synthesized graphene was carried out via transmission electron microscopy (TEM) and X-ray analysis. Photocatalytic degradation of the RR195 colorant was carried out by using ZnO-graphene composites. As a result, with increasing concentration of Graphene–ZnO composite in the environment, the color removal efficiency increased to 10.0 g/L Graphene–ZnO composition concentration. A similar propensity was observed for TOC removal. At the end of the photocatalytic reaction (90 min), in the environment using 10.0 g/L Graphene–ZnO composition, maximum color and TOC removal efficiencies were measured as 98.50% and 89.3%, respectively. 

Anahtar Kelimeler

C.I. Reactive red 195, Graphene, Photocatalytic degradation, TOC, ZnO

ZnO-Grafen Nanokompozitinin Sol-Jel Yöntemiyle Üretimi ve Fotokatalizör Olarak Kullanılması

Öz

Bu çalışmada Grafen-ZnO kompozitinin üretimi ve kısmi fotokatalitik özellikleri incelenmiştir. Kompozitte takviye elemanı olarak kullanılan grafen nano tabakalar sıvı faz eksfolasyon yöntemi ile üretilmiştir. Elde edilen bu tabakalar Sol-Jel prosesi sırasında ilave edilerek ZnO ile grafenin homojen karışması sağlanmıştır. Hatta bazı bölgelerde grafenler ZnO partikülleri tarafından sarılmıştır. Sentezlenen grafenin karakterizasyonu geçirmeli elektron mikroskobu ve X-ışını analizleri ile yapılmıştır. Elde edilen kompozitin ise karakterizasyonu taramalı elektron mikroskobu ile yapılmıştır. Grafen-ZnO kompoziti kullanılarak RR195 boyarmaddenin fotokatalitik degradasyon yapılmıştır. Bunun sonucunda, ortamdaki Grafen-ZnO kompoziti konsantrasyonunun artışına paralel olarak renk giderim verimi 10,0 g/L Grafen-ZnO kompoziti konsantrasyonuna kadar artmıştır. Benzer eğilim TOC giderimi için de gözlemlenmiştir. Fotokatalitik reaksiyon süresi sonunda (90 dk) 10,0 g/L Grafen-ZnO kompoziti kullanılan ortamda maksimum renk ve TOC giderim verimleri sırasıyla %98,50 ve %89,3 olarak ölçülmüştür.

Anahtar Kelimeler

Grafen, C.I. Reactive red 195, Fotokatalitik degradasyon, TOC, ZnO.

Kaynakça

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