Hummers ve Askorbik Asit ile Kimyasal İndirgenme Metotlarında Döngüsel Yaklaşım

Öz

Grafitten, Hummers metodu ile sentezlenen grafen oksidin ve sonrasında grafen oksitten kimyasal indirgenme metodu ile sentezlenen indirgenmiş grafen oksidin, pek çok kullanım alanlarına sahiptir. Bu çalışmada döngüsel yaklaşım ile grafen oksit ve indirgenmiş grafen oksit sentezlenmesi hedeflenmiştir. Bu hedef ile grafitten, Hummers yöntemi ile grafen oksit ve ardından kimyasal indirgenme metodunda askorbik asit kullanılarak indirgenmiş grafen oksit sentezlenerek birinci döngü tamamlanacaktır. Birinci döngüden sentezlenen indirgenmiş grafen oksit ikinci döngüde grafit yerine Hummers yönteminde kullanılarak döngüsel yaklaşım hedeflenmiştir. Döngü prosesi ile dört farklı grafen oksit ve indirgenmiş grafen oksit örnekleri elde edilmiştir. Sentezlenen her bir döngüye ait grafen oksit ve indirgenmiş grafen oksit örneklerinde, FTIR, RAMAN, BET, ZETA-SİZER ve SEM-EDS analizleri ile döngüsel yaklaşımda grafen oksit ve indirgenmiş grafen oksit örneklerinin karakterizasyonu gerçekleştirilmiştir. Döngüsel yaklaşım ile grafen oksit örneklerinde oksidasyon derecelerinin artması ile yapıdaki kusurlu bölgelerinin artığı, indirgenmiş grafen oksit örneklerinde ise oksidasyon derecelerinin azalması ile yapıdaki kusurlu bölgelerinin azaldığı tespit edilmiştir.

Anahtar Kelimeler

• Grafen oksit
• hummers yöntemi
• askorbik asit
• kimyasal indirgeme
• döngü metodu.

The Cyclical Approach in Chemical Reduction Methods Using Hummers and Ascorbic Acid

Öz

Graphene oxide synthesized from graphite by the Hummers method and then reduced graphene oxide synthesized from graphene oxide by the chemical reduction method have many uses. In this study, the cyclic approach was used to synthesize graphene oxide and reduced graphene oxide. With this goal, the first cycle will be completed by synthesizing graphene oxide from graphite using the Hummers method and then reducing graphene oxide using ascorbic acid in the chemical reduction method. The cyclic approach aimed to use the reduced graphene oxide synthesized from the first cycle in the Hummers method instead of graphite in the second cycle. Four different graphene oxide and reduced graphene oxide samples were obtained by the loop process. Graphene oxide and reduced graphene oxide samples belonging to each synthesized cycle were characterized by FTIR, RAMAN, BET, ZETA-SIZER, and SEM-EDS analyses, and graphene oxide and reduced graphene oxide samples were characterized by a cyclic approach. With the cyclic approach, it was found that the defective regions in the structure increased with the increase of oxidation degrees in graphene oxide samples, and the faulty areas of the structure decreased with the decrease of oxidation degrees in reduced graphene oxide samples.

Anahtar Kelimeler

• Graphene oxide
• hummers method
• ascorbic acid
• chemical reduction
• cycle method

Kaynakça

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