In this study, an electrochemical sensor was developed and used for selective determination of bisfenol-A (BPA) by integrating sol-gel technique and multi-walled carbon nanotubes (MWCNTs) modified paste electrode. BPA bounded by covalently to isocyanatopropyl-triethoxy silane (ICPTS) was synthesized as a new precursor (BPA-ICPTS) and then BPA-imprinted polymer (BPA-IP) sol-gel was prepared by using tetramethoxysilane (TMOS) and BPA-ICPTS. Non-imprinted polymer (NIP) sol-gel was obtained by using TMOS and (3-Aminopropyl) triethoxysilane. Both BPA-IP and NIP sol-gels were characterized by nitrogen adsorption-desorption analysis, FTIR, SEM, particle size analyzer and optical microscope. Carbon paste sensor electrode was fabricated by mixing the newly synthesized BPA-IP with MWCNTs, graphite powder and paraffin oil. The electrochemical characterization of the sensor electrode was achieved with cyclic and differential pulse voltammetric techniques. The response of the developed sensor under the most proper conditions was linear in BPA concentration range from 4.0×10−9 to 1.0×10−7 mol L−1 and 5.0×10−7 to 5.0×10−5 mol L−1 and the detection limit was 4.4×10−9 mol L−1. The results unclosed that the proposed sensor displayed high sensitivity and selectivity, superior electrochemical performance and rapid response to BPA.

中文翻译：

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基于共价分子印迹选择性测定双酚A的电化学传感器的研制

在这项研究中，通过整合溶胶-凝胶技术和多壁碳纳米管 (MWCNTs) 改性糊状电极，开发了一种电化学传感器并用于选择性测定双酚 A (BPA)。合成了与异氰酸酯丙基三乙氧基硅烷 (ICPTS) 共价结合的 BPA 作为新的前驱体 (BPA-ICPTS)，然后使用四甲氧基硅烷 (TMOS) 和 BPA-ICPTS 制备了 BPA 印迹聚合物 (BPA-IP) 溶胶-凝胶。通过使用 TMOS 和 (3-氨基丙基) 三乙氧基硅烷获得非印迹聚合物 (NIP) 溶胶-凝胶。BPA-IP 和 NIP 溶胶-凝胶均通过氮吸附-解吸分析、FTIR、SEM、粒度分析仪和光学显微镜进行表征。通过将新合成的 BPA-IP 与多壁碳纳米管、石墨粉和石蜡油混合制成碳糊传感器电极。传感器电极的电化学特性是通过循环和差分脉冲伏安技术实现的。开发的传感器在最合适条件下的响应在 BPA 浓度范围从 4.0×10-9 到 1.0×10-7 mol L-1 和 5.0×10-7 到 5.0×10-5 mol L-1 和检测限为 4.4×10-9 mol L-1。结果表明，所提出的传感器显示出高灵敏度和选择性、优异的电化学性能和对 BPA 的快速响应。