توسعه سنسور الکتروشیمیایی مس با استفاده از الکترود اصلاح شده با اکسید گرافن عاملدار شده با D-پنیسیل آمین

نوع مقاله : مقاله علمی پژوهشی

نویسندگان

1 دانشکده علوم و شیمی، گروه نانوفناوری، دانشگاه ارومیه، رومیه، ایران

2 دانشکده علوم و شیمی، گروه نانوفناوری، دانشگاه ارومیه، رومیه، ایران. پژوهشکده نانو فناوری، دانشگاه ارومیه، ارومیه، ایران

چکیده

در این کار پژوهشی اکسید گرافن (GO) با D- پنیسیل آمین (DPA) عاملدار شده و برای توسعه سنسور الکتروشیمیایی کاتیون مس(II) مورد استفاده قرار گرفت. برای تأیید سنتز موفق اکسید گرافن عاملدار شده با دی پنیسیل آمین (DPA-GO)، از طیف‌سنجی فروسرخ تبدیل فوریه (FTIR)، میکروسکوپ الکترونی روبشی (SEM)، الگوی پراش پرتو ایکس(XRD) و میکروسکوپ الکترونی عبوری (TEM) استفاده شد. الکترود کربن‌شیشه‌ای اصلاح‌شده با اکسید گرافن عامل‌دار شده با D- پنیسیل آمین (DPA-GO/GCE) تهیه و رفتار الکتروشیمیایی آن در حضور کاتیون‌های مس(II) به روش ولتامتری چرخه‌ای بررسی شد و نتایج حاصله نشان‌دهنده عملکرد بهتر الکترود اصلاح شده با DPA-GO در مقایسه با الکترود برهنه و الکترود اصلاح شده با اکسید گرافن می‌باشد که به ساختار نانومتری GO و قابلیت کمپلکس‌کنندگی گروه‌های عاملی دارای گوگرد، نیتروژن و اکسی‍ژن موجود در ساختار DPA مربوط است. سنسور تهیه شده برای اندازه‌گیری انتخابی و حساس کاتیون‌های مس(II) به روش ولتامتری برهنه‌سازی آندی موج مربعی (SW-ASV) به کار برده شد و تأثیر پارامترهای مؤثر در عملکرد سنسور بررسی شد و شرایط بهینه برای عملکرد سنسور تعیین گردید. در شرایط بهینه بدست آمده الکترود تهیه شده در محدوده غلظتی 1 پیکومولار تا 1/0 میکرومولار دارای پاسخ خطی بوده و حد تشخیص آن 31/0 پیکومولار می‌باشد. سنسور پیشنهادی بطور رضایت‌بخشی برای اندازه‌گیری کاتیون مس در نمونه‌های حقیقی آب با تکرارپذیری و پایداری مناسب مورد استفاده قرار گرفت.

کلیدواژه‌ها


عنوان مقاله [English]

Development of copper electrochemical sensor using D-penicillamine functionalized graphene oxide modified electrode

نویسندگان [English]

  • Maryam Khordadpour Siahkal Mahalleh 1
  • Fatemeh Ahour 2
  • Sajjad Keshipour 2
1 Nanotechnology Research Group, Faculty of Science, Urmia University, Urmia, Iran
2 Nanotechnology Research Group, Faculty of Science, Urmia University, Urmia, Iran. Nanotechnology Research Center, Urmia University, Urmia, Iran.
چکیده [English]

In this research, graphene oxide (GO) was functionalized with D-penicillamine (DPA) and used to develop an electrochemical sensor for Cu(II) cation. For the successful synthesis of D-penicillamine-functionalized graphene oxide (DPA-GO), Fourier Transfer Infrared Spectroscopy (FTIR), Scanning Electron Microscope (SEM), X-ray diffraction pattern (XRD), and Transmission Electron Microscopy (TEM) are used. DPA-GO modified glassy carbon electrode (DPA-GO / GCE) was prepared and its electrochemical behavior was studied in the presence of Cu(II) cations by cyclic voltammetry, and the results showed the better performance of the DPA-GO-modified electrode compared to unmodified and GO-modified electrode, which related to GO nanostructure and complexing ability of sulfur, nitrogen, and oxygen-containing functional groups in the DPA structure. The prepared sensor was used for the selective and sensitive measurement of Cu(II) cations by square-wave anodic stripping voltammetry (SW-ASV) and the factors affecting the sensor performance were investigated and optimum conditions for sensor operation were determined. Under the optimal conditions, the prepared electrode has a linear response in the range of 1 pM to 0.1 µM and its detection limit was 0.31 pM. The proposed sensor was used satisfactorily to measure copper cation in real water samples with suitable reproducibility and stability.

کلیدواژه‌ها [English]

  • Modified electrode
  • Graphene oxide
  • D-penicillamine
  • Stripping voltammetry
  • Copper cation
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