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A COF/Carbon Black-Based Electrochemical Sensor for Trace Catechol Detection in Tap and River Water
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DOI：10.1149/1945-7111/ae6899.png)
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Abstract
En 中文
Catechol (CC), a typical toxic phenolic pollutant in aquatic environments, poses severe threats to ecology and human health, and an efficient sensing method for trace CC detection is urgently needed. Herein, a carboxyl-functionalized covalent triazine framework (CTF-2COOH) with a hierarchical flower-like porous structure was synthesized, and the morphological and structural characterizations systematically verified its favorable porous texture and large specific surface area. On this basis, a CTF-2COOH/carbon black (CB) composite was further prepared, and related tests confirmed the successful composite fabrication with a well-preserved porous architecture to fabricate an electrochemical sensor chip. CTF-2COOH offers a large specific surface area and abundant active sites, while CB enhances the composite's conductivity, triggering remarkable synergistic electrocatalysis towards CC. The optimized sensor (75% CB content) presents an extended linear detection range of 0.1-100 mu M, a low limit of detection of 80.7 nM, favorable selectivity, excellent repeatability, reproducibility, and long-term stability. It also realizes reliable CC detection in real tap water and river water with satisfactory recoveries of 90.2%-104.2%, owing to the reversible adsorption interaction between CTF-2COOH and CC. This work provides a high-performance sensing strategy for CC monitoring and a feasible reference for COF-based electrochemical sensor design. A reusable electrochemical sensor chip is fabricated using a CTF-2COOH/CB composite for trace catechol (CC) detection.The sensor exhibits a wide linear range (0.1-10 mu M) and a low detection limit of 81.52 nM with high selectivity.Excellent reusability over 9 successive runs endows the sensor with enhanced economic efficiency.An adsorption-catalysis synergistic mechanism is validated, which significantly amplifies the detection signal.
Keywords:
sensors
electrocatalysis
electroanalytical electrochemistry
surface modification
nanoscale materials
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3.3
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3.3W
Citations:
9.4W
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