شیمى کاربردى روز

شیمى کاربردى روز

استفاده از نانو ذرات چارچوب آلی کووالانسی به عنوان ماده حسگری برای ساخت حسگر ولتامتری نقره: بهینه سازی شرایط تجربی با طرح مرکب مرکزی جزء میانی

نوع مقاله : مقاله علمی پژوهشی

نویسندگان
گروه شیمی، واحد شهرضا، دانشگاه آزاد اسلامی، شهرضا، ایران
چکیده
در این تحقیق یک چارچوب آلی کووالانسی مبتنی بر بنزوتیادی‌آزول (BT-COF) از طریق اتصالات ایمینی و واکنش شیف-باز کاتالیز شده با اسید، تهیه شده است که دارای تبلور و پایداری شیمیایی بالا است. ساخت و کاربرد یک الکترود خمیر کربن(CPE) اصلاح شده با نانو ذرات BT-COF به عنوان حسگر ولتامتری (BT-COF/CPE) جهت اندازه‌گیری یون نقره مبنای این کار تحقیقاتی است. اطلاعات تجربی حاصل به نحو مناسبی در یک مدل درجه دوم به دست آمده از روش طراحی مرکب مرکزی جزء میانی(HF-CCD)، برازش شدند. نقش اصلی BT-COF در این حسگر ولتامتری را می‌توان مربوط به وجود جایگاه‌های اتصال متعدد در ساختار آن برای تشکیل کمپلکس با نقره، مساحت سطح بزرگ و حجم بالای حفرات BT-COF دانست که باعث تضعیف ممانعت فضایی هنگام تشکیل کمپلکس بین نقره و جایگاه‌های اتصال COF می‌شود و همچنین دستیابی نقره به گروه‌های عاملی درون کانال‌های COF را آسانتر می‌کنند و علاوه بر این فضایی بزرگ را برای ترسیب مقدار زیادی نقره ایجاد می‌کنند. انجام رگرسیون در سطح معنی‌داری ۵٪ و در گستره 1/0-۱۰۰ نانومولار به حصول یک معادله خطی بین جریان عاری‌سازی و غلظت یون نقره در محلول پیش‌تغلیظ منجر شد. حد تشخیص نیز 06/0 نانومولار بود. میزان تاثیر مزاحمت‌ها در عملکرد حسگر پیشنهادی مورد بررسی قرار گرفت. برای بررسی اصول عملکرد حسگر ولتامتری حاصل از روش‌های الکتروشیمیایی و SEM/EDS/MAP استفاده شد. توانایی حسگر تهیه شده در تعیین مقدار نقره در نمونه‌های حقیقی مورد بررسی قرار گرفت.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

The Use of Covalent Organic Framework Nanoparticles as a Sensing Material for the Fabrication of Silver Voltammetric Sensor: Optimization of Experimental Conditions With the Half Fraction Central Composite Design

نویسندگان English

Amir Taghavi Larmaei
Ali Reza Zanganeh
Department of Chemistry, Shahreza Branch, Islamic Azad University, Shahreza, Iran
چکیده English

In this research, a benzothiadiazole-based covalent organic framework (BT-COF) has been prepared through imine linkage and acid-catalyzed Schiff-base reaction, which has high crystallinity and chemical stability. The construction and application of a modified carbon paste electrode (CPE) with BT-COF nanoparticles as a voltammetric sensor (BT-COF/CPE) to measure silver ion is the basis of this research work. The obtained experimental data were properly fitted in a quadratic model obtained from the half fraction central composite design (HF-CCD) method. The main role of BT-COF in this voltammetric sensor can be related to the presence of multiple binding sites in its structure to form a complex with silver, large surface area and high volume of BT-COF pores which is known to weaken the steric hindrance when forming a complex between silver and COF binding sites, and also make it easier for silver to reach the functional groups inside COF channels, and in addition, they create a large space for the deposition of a large amount of silver. Regression at a significance level of 5% and in the range of 0.1-100 nM led to a linear equation between the stripping current and the silver ion concentration in the pre-concentration solution. The detection limit was 0.06 nM. The impact of interferences on the performance of the proposed sensor was investigated. Electrochemical and SEM/EDS/MAP methods were used to check the performance principles of the resulting voltammetric sensor. The ability of the prepared sensor to determine the amount of silver in real samples was investigated.

کلیدواژه‌ها English

covalent organic framework
benzothiadiazole
carbon paste electrode
voltammetric sensor
silver ion
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