1H-1, 2, 4-triazole-3-thiol modifiye altın elektrot kullanılarak fenolün elektrokimyasal davranışının incelenmesi ve voltametrik tayini

Yıl 2020, Cilt: 35 Sayı: 2, 835 - 844, 25.12.2019

Tuğba Tabanlıgil Calam

https://doi.org/10.17341/gazimmfd.543608

Cited By: 6

Öz

Bu çalışmada, 1H-1,2,4-triazole-3-thiol (T3T) ile altın (Au) elektrot yüzeyi
kaplanarak Au/T3T elektrodu hazırlanmıştır. Kaplama işlemi, dönüşümlü
voltametri (CV) yöntemi kullanılarak 1×10^-3 mol L^-1
T3T çözeltisi içerisinde, 0,1
V s^-1 tarama hızıyla -0,8 V ile +1,5 V arasında, 30 çevrim
sayısı ile
gerçekleştirilmiştir. Hazırlanan Au/T3T elektrodu yüzeyinde dönüşümlü
voltametri (CV) ve diferansiyel puls voltametrisi (DPV) teknikleri kullanılarak
fenolün (Ph) elektrokimyasal davranışı incelenmiş ve DPV tekniği ile voltametrik
tayini gerçekleştirilmiştir. Au/T3T elektrodu ile Ph tayini için uygun olan destek elektrolit ve pH gibi
optimum çalışma şartları belirlenmiştir. En uygun destek elektrolit ortamının pH
1.0 HClO₄ çözeltisi olduğu belirlenmiştir. Au elektrot yüzeyinin T3T
ile modifiye edilmesiyle, fenolün yükseltgenme pikinin akım değerinde 3,41 kat
artış olduğu belirlenmiştir. Au/T3T
modifiye elektrot ile Ph için çalışma aralığı 1,0´10^-7–3,6´10^-5
M ve gözlenebilme
sınırı (LOD) 1,2´10^-8
M olarak belirlenmiştir. Au/T3T elektrodunun Ph tayininde iyi bir tekrarlanabilirlik,
kararlılık ve seçiciliğe sahip olduğu tespit edilmiştir. Modifiye
elektrotla, musluk suyunda standart ekleme yöntemi kullanarak düşük bağıl
standart sapma (BSS) ve iyi bir geri kazanım değerleri ile Ph tayini
gerçekleştirilmiştir. 

Anahtar Kelimeler

Fenol, toksik, modifikasyon, elektrokimyasal davranış, voltametrik tayin

Investigation of the electrochemical behavior of phenol using 1H-1, 2, 4-triazole-3-thiol modified gold electrode and its voltammetric determination

Öz

In this study 1H-1,2,4-triazole-3-thiol (T3T) was deposited at the gold electrode to fabricate a new sensor and
used for the determination of phenol (Ph). Comparing with the bare Au and T3T modified Au (Au/T3T)
electrode, the Au/T3T electrode has higher catalytic activities towards the oxidation of Ph. Figure A shows
that electrode modification provided 3.41-fold increase at the precision.
Figure A. Differential pulse voltammograms of Ph on the Au and Au/T3T electrode at pH 1.0 in HClO4
solution (a), Possible oxidation mechanism of phenol (b).
Purpose: The aim of this study to develop a new and applicable sensor in real samples used for the
determination of phenol compound.
Theory and Methods:
Phenol is a kind of pollutant and it widely exists in water, atmosphere, chemical productions, and canned food.
The phenol is potentially fatal if ingested, inhaled and absorbed by skin and may cause severe burns and
influence kidney, liver and central nervous system. Therefore, determination of phenol is very important due
to its toxic and dangerous properties to enviromental and people’s health. The use of modified electrodes in
analytical applications has become an active research area in electrochemistry thanks to its low cost, rapid
response, low detection limit, selectivity and high precision. Modification of electrode surfaces with redoxactive organic molecules that contain heteroatom has an important process. Among the coating molecules on
electrode surfaces, triazole and its derivatives have been preferred because of their advantages of having high
redox activity and quietly good thermal stability.
Results:
The calibration curve and limit of detection (LOD) were obtained in the range of 1.0×10-7 – 3.6 ×10-5 mol L-1
and 1.2×10-8 mol L-1 on the Au/T3T modified electrode, respectively. The interference effects of various
anions, cations and compounds on this method were investigated. Besides, the reproducibility, repeatability,
and stability measurements were also assayed. In addition, the obtained electrode showed satisfactory results
when applied to the determination of Ph in tap water with low relative standart deviation values on the Au/T3T
modified electrode by standard addition method.
Conclusion:
This study has indicated that the T3T modified Au electrode exhibits highly electrocatalytic activity to Ph
oxidation at pH 1.0 in HClO4 solution. The prepared electrode was successfully used to the determination of
Ph in tap water.  

Anahtar Kelimeler

Phenol, Toxic, Modification, Electrochemical behavior, Voltammetric determination

Kaynakça

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