Termal indirgenmiş grafen oksit ile elektrokimyasal olarak askorbik asit tayini

Okutan, Merve

doi:10.17341/gazimmfd.645284

Termal indirgenmiş grafen oksit ile elektrokimyasal olarak askorbik asit tayini

Merve OKUTAN (Hitit Üniversitesi, Mühendislik Fakültesi, Kimya Mühendisliği Bölümü, Çorum, Türkiye)

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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Yıl: 2020 Cilt: 35 Sayı: 3 Sayfa Aralığı: 1589 - 1601 Metin Dili: Türkçe DOI: 10.17341/gazimmfd.645284 İndeks Tarihi: 13-01-2021

Termal indirgenmiş grafen oksit ile elektrokimyasal olarak askorbik asit tayini

Öz:

Bu çalışma, yüksek sıcaklıkta ani termal işlem ile indirgenmiş grafen oksitin (T-rGO) sentezi, SEM, XRD,Raman, FTIR, EDX teknikleriyle karakterizasyon analizi ve elektrokimyasal karakterizasyonu hakkındadır.T-rGO ve Nafion çözeltisi (N117) ile kaplanmış camsı karbon elektrot (GCE) doğrudan fosfat tamponçözeltisi (PBS) içerisindeki askorbik asit (AA) varlığının algılanması için kullanılmıştır. Modifiye GCE’ninelektrokimyasal davranışının değerlendirilmesi için dönüşümlü voltametri (CV), diferansiyel puls voltametri(DPV) ve amperometrik tekniklerden yararlanılmıştır. Bu amaçla başlangıç malzemesi olan sentetik grafittenmodifiye Hummers yöntemi ile grafen oksit (GO) sentezlenmiştir. Ardından T-rGO, GO’nun inert gazortamında ve yüksek sıcaklıkta ani termal işlem uygulanarak indirgenmesi ile elde edilmiştir. XRD analizverileri kullanılarak yaklaşık 3,32 tabaka sayısına sahip T-rGO sentezlendiği tespit edilmiştir. 5,0 mM AAiçeren farklı pH değerlerine sahip (6, 7 ve 8) fosfat tampon çözeltileri (PBS) arasından pH değeri 8 olançözeltide GCE/T-rGO elektrotu için en belirgin ve yüksek akıma sahip anodik yükseltgenme pikigözlenmiştir. Elde edilen sonuçlara göre hazırlanan GCE/T-rGO elektrotu, AA için yeniden üretilebilirlik(RSD=%6,25, n=3) ve tekrarlanabilirlikle (RSD=%2,14, n=3), yüksek hassasiyete (0,3 μA mM-1) ve tayinlimitine (0,61 μM) sahiptir. Ayrıca, GCE/T-rGO elektrot ürik asit, dopamin, KCl, NaCl ve CaCl2’e karşıyüksek seçicilik sergilemiştir. Bu nedenlerle, hazırlanan GCE/T-rGO elektrotların AA molekülününelektrokimyasal tayininde kullanılabileceği düşünülmektedir.

Anahtar Kelime:

Electrochemical determination of ascorbic acid with thermally reduced graphene oxide

Öz:

The present work, describe the synthesis of thermally reduced graphene oxide (T-rGO) with high temperature flash heat treatment and its characterization by SEM, XRD, Raman, FTIR, EDX and electrochemistry. The T-rGO and Nafion solution (N117) modified glassy carbon electrode (GCE) was directly used for electrochemical sensing of ascorbic acid (AA) in the phosphate buffer solution (PBS). Electrochemical behavior of the modified GCE was identified by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and amperometric techniques. For this purpose, graphene oxide (GO) was synthesized from the synthetic graphite as starting material using by the modified Hummers method. Then, T-rGO was obtained by reducing GO by applying flash and high temperature thermal treatment in an inert gas environment. It was determined that the number of layer is about 3.32 for T-rGO according to XRD analysis. In the PBS with different pH values (6, 7 and 8) containing 5.0 mM AA, the most prominent anodic oxidation peak with high current density was observed for the GCE/T-rGO electrode when the electrolyte pH value was 8. According to the results, the prepared GCE/T-rGO electrode exhibited good sensitivity (0.3 μA mM-1) and low detection limit (0.61 μM) of AA with good reproducibility (RSD=6.25%, n=3) and repeatability (RSD=2.14%, n=3). In addition, the GCE/T-rGO electrode showed good selectivity against the uric acid, dopamine, KCl, NaCl and CaCl2. For these reasons, it is thought that the GCE/T-rGO electrodes can be used for electrochemical determination of AA molecule.

Anahtar Kelime:

Belge Türü: Makale Makale Türü: Araştırma Makalesi Erişim Türü: Erişime Açık

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APA	Okutan M (2020). Termal indirgenmiş grafen oksit ile elektrokimyasal olarak askorbik asit tayini. , 1589 - 1601. 10.17341/gazimmfd.645284
Chicago	Okutan Merve Termal indirgenmiş grafen oksit ile elektrokimyasal olarak askorbik asit tayini. (2020): 1589 - 1601. 10.17341/gazimmfd.645284
MLA	Okutan Merve Termal indirgenmiş grafen oksit ile elektrokimyasal olarak askorbik asit tayini. , 2020, ss.1589 - 1601. 10.17341/gazimmfd.645284
AMA	Okutan M Termal indirgenmiş grafen oksit ile elektrokimyasal olarak askorbik asit tayini. . 2020; 1589 - 1601. 10.17341/gazimmfd.645284
Vancouver	Okutan M Termal indirgenmiş grafen oksit ile elektrokimyasal olarak askorbik asit tayini. . 2020; 1589 - 1601. 10.17341/gazimmfd.645284
IEEE	Okutan M "Termal indirgenmiş grafen oksit ile elektrokimyasal olarak askorbik asit tayini." , ss.1589 - 1601, 2020. 10.17341/gazimmfd.645284
ISNAD	Okutan, Merve. "Termal indirgenmiş grafen oksit ile elektrokimyasal olarak askorbik asit tayini". (2020), 1589-1601. https://doi.org/10.17341/gazimmfd.645284

APA	Okutan M (2020). Termal indirgenmiş grafen oksit ile elektrokimyasal olarak askorbik asit tayini. Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi, 35(3), 1589 - 1601. 10.17341/gazimmfd.645284
Chicago	Okutan Merve Termal indirgenmiş grafen oksit ile elektrokimyasal olarak askorbik asit tayini. Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi 35, no.3 (2020): 1589 - 1601. 10.17341/gazimmfd.645284
MLA	Okutan Merve Termal indirgenmiş grafen oksit ile elektrokimyasal olarak askorbik asit tayini. Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi, vol.35, no.3, 2020, ss.1589 - 1601. 10.17341/gazimmfd.645284
AMA	Okutan M Termal indirgenmiş grafen oksit ile elektrokimyasal olarak askorbik asit tayini. Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi. 2020; 35(3): 1589 - 1601. 10.17341/gazimmfd.645284
Vancouver	Okutan M Termal indirgenmiş grafen oksit ile elektrokimyasal olarak askorbik asit tayini. Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi. 2020; 35(3): 1589 - 1601. 10.17341/gazimmfd.645284
IEEE	Okutan M "Termal indirgenmiş grafen oksit ile elektrokimyasal olarak askorbik asit tayini." Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi, 35, ss.1589 - 1601, 2020. 10.17341/gazimmfd.645284
ISNAD	Okutan, Merve. "Termal indirgenmiş grafen oksit ile elektrokimyasal olarak askorbik asit tayini". Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi 35/3 (2020), 1589-1601. https://doi.org/10.17341/gazimmfd.645284