Gallik Asit Tayinine Yönelik Kompozit Metal Oksit ile Modifiye Edilmiş Grafen Oksit Elektrot

Öz

Bu çalışmada kompozit metal oksit modifiye grafen oksitler camımsı karbon elektrot yüzeyinde hazırlanmıştır. Bu amaçla, öncelikle drop-dry tekniğiyle grafen oksit modifiye/camımsı karbon elektrot (GO/GCE) hazırlanmıştır. Ardından GO/GCE yüzeyine elektrokimyasal yöntemle TeOx-ZnOx nanoparçacıklar modifiye edilmiştir (TeOx-ZnOx/GO/GCE). Hazırlanan modifiye yüzey elektrokimyasal impedans spektroskopisi tekniği ve döngüsel voltammetri kullanılarak diğer elektrotlar ile karşılaştırılmıştır. TeOx-ZnOx/GO/GCE ile gallik asidin elektrokimyasal davranışı pH 2.3 Britton-Robinson tamponu içerisinde incelenmiştir. Optimize edilmiş koşullar altında, sensörün gallik asidi tespit etmek için amperometri tekniği ile elde edilen lineer ölçüm aralığı 0.5 µmol L⁻¹ - 1000 µmol L⁻¹ olup, LOD (tayin sınırı) 0.2 µmol L⁻¹ olarak belirlenmiştir. Gerçek örnek analizi çay örneğinde başarıyla çalışılmıştır. Sonuç olarak, önerilen kompozit modifiye elektrodun, gallic acid tayinine yönelik kararlı bir yüzey olarak doğru ve duyarlı bir analize imkan sağladığı görülmektedir.

Anahtar Kelimeler

• Gallik Asit
• grafen oksit
• tellür oksit
• çinko oksit
• modifiye elektrot

Etik Beyan

Bu çalışmanın yayımlanmasıyla ilgili herhangi bir etik sorun bulunmamaktadır.

Composite Metal Oxide Modified–Graphene Oxide Electrode for Gallic Acid Determination

Öz

In this study, composite metal oxide modified graphene oxides were prepared on the surface of a glassy carbon electrode. For this aim, a graphene oxide-modified/glassy carbon electrode (GO/GCE) was initially prepared using the drop-dry technique. Subsequently, TeOx-ZnOx nanoparticles were modified onto the GO/GCE surface using an electrochemical method (TeOx-ZnOx/GO/GCE). The prepared modified surface was compared with other electrodes using electrochemical impedance spectroscopy and cyclic voltammetry. The electrochemical behavior of gallic acid was investigated with the TeOx-ZnOx/GO/GCE in a pH 2.3 Britton-Robinson buffer. Under optimized conditions, the sensor exhibited a linear range of 0.5 µmol L⁻¹ -1000 µmol L⁻¹ for gallic acid detection using the amperometry technique, with a limit of detection (LOD) of 0.2 µmol L⁻¹. Real sample analysis was successfully performed with tea samples. In conclusion, the proposed composite modified electrode provides a stable surface for accurate and sensitive analysis of gallic acid determination.

Anahtar Kelimeler

• Gallic acid
• graphene oxide
• tellurium oxide
• zinc oxide
• modified electrode

Etik Beyan

There are no ethical issues regarding the publication of this study

Kaynakça

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