Abstract
Abstract 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 to10−7 mol·L−1, a lower detection limit of 1.74 × 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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