Journal
SYNTHETIC METALS
Volume 254, Issue -, Pages 164-171Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2019.06.017
Keywords
Electrochemical biosensor; Lead ion; Metal-organic framework; DNAzyme
Funding
- Nation Natural Science Foundation of China [51273155, 21476179]
- Fundamental Research Funds for the Central Universities [2016IB005, 2017IB007]
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Based on the electrode modified by the carboxyl-functionalized graphene, a highly sensitive electrochemical sensor for Pb2+ detection was proposed by using 8-17 DNAzyme as the recognition element and the reaction of H2O2 catalyzed by Fe-MIL-101 as the signal probe. Due to the high selectivity of the 8-17 DNAzyme to Pb2+, the excellent catalytic ability of Fe-MIL-101 and the advantages of graphene, the proposed electrochemical sensor exhibited an excellent sensing performance with a wide linear range of 10(-13) to 10(-7 )mol.L-1, a lower detection limit of 1.74 x 10(-14) mol.L-1 and high selectivity to Pb2+. Tap water and river water were analyzed by the developed sensor with satisfying recoveries and RSD, demonstrating a promising practicability for the determination of Pb2+ in the real sample analysis. Furthermore, the proposed strategy could be extended to the determination of other metal ions just by changing the specific DNAzymes.
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