Selective binding of Pb2+ with manganese-terephthalic acid MOF/SWCNTs: Theoretical modeling, experimental study and electroanalytical application

A nanocomposite of flake-shaped manganese-terephthalic acid MOF/single-walled carbon nanotubes (Mn(TPA)-SWCNTs) was synthesized using manganese chloride, terephthalic acid and SWCNTs as raw materials. Theoretical modeling study shows that the Mn(TPA) component has stronger adsorption ability to lead...

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Veröffentlicht in:Biosensors & bioelectronics 2017-12, Vol.98, p.310-316
Hauptverfasser: Cai, Fuxian, Wang, Qinghua, Chen, Xiaoqian, Qiu, Weiwei, Zhan, Fengping, Gao, Fei, Wang, Qingxiang
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Sprache:eng
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Zusammenfassung:A nanocomposite of flake-shaped manganese-terephthalic acid MOF/single-walled carbon nanotubes (Mn(TPA)-SWCNTs) was synthesized using manganese chloride, terephthalic acid and SWCNTs as raw materials. Theoretical modeling study shows that the Mn(TPA) component has stronger adsorption ability to lead ion (Pb2+) than the other common heavy metal ions, which is in good agreement with the result of electrochemical assay. Then, the Mn(TPA)-SWCNTs were used as a sensing matrix for the voltammetric determination of Pb2+. The results displayed that the sensor shows high analytical performance for Pb2+ due to the synergy of Mn(TPA) with highly selective binding to Pb2+ and SWCNTs with high electronic conductivity. Under the optimal conditions, the Mn(TPA)-SWCNTs-based electrochemical sensor presented a wide linear response over the concentration range from 0.10 to 14.0μM. The limit of detection was achieved to be 38nM. Satisfactory results were also achieved when the Mn(TPA)-SWCNTs-based sensor was utilized for the determination of Pb2+ in the practical samples of industrial wastewater and human serum, suggesting great promising of the sensor for practical application. •The novel composite of flake-like Mn(TPA) MOF and SWCNTs was synthesized.•Selective binding of Mn(TPA) and Pb2+ was assessed by theoretical modeling and electrochemical assay.•An electrochemical sensor for Pb2+ was fabricated using Mn(TPA)-SWCNTs as sensing matrix.•The sensor is applicable for Pb2+ detection in industrial wastewater and serum samples.
ISSN:0956-5663
1873-4235
DOI:10.1016/j.bios.2017.07.007