Construction of nickel cobalt-layered double hydroxide/ functionalized-halloysite nanotubes composite for electrochemical detection of organophosphate insecticide

The development of electrode materials with swift response has always been a crucial need for the safety of many foods and environmental applications. Herein, we demonstrate a one-pot hydrothermal approach to synthesize a hybrid nickel cobalt-layered double hydroxide/ functionalized halloysite nanotubes (NiCo-LDH/F-HNTs) com-posite for the electrochemical detection of parathion (PT). The physicochemical and structural characterizations of the prepared NiCo-LDH/F-HNTs composites were meticulously investigated for detailed understanding. Experimental results confirm that the NiCo-LDH/F-HNTs modified electrode shows high electrochemical efficiency for the PT reduction compared to other electrodes. This enhanced activity is attributed to the synergistic effect, numerous active sites, high conductivity, large specific surface area, rapid electron transfer of NiCo-LDH/ F-HNTs composite. After parameter optimization, the NiCo-LDH/F-HNTs based electrochemical sensor provides the superior performance, such as a wide linearity range from 0.01 to 33.4 mu M, the limit of detection as low as 0.002 mu M, the sensitivity as high as 13.0 mu A mu M-1 cm(-2), good selectivity and excellent reproducibility. Besides, the real-time detection of PT in environmental samples also shows satisfactory results. Overall, our work pro-vides an approach for the design and development of electrochemical sensors for trace-level PT analysis with facile fabrication, high activity, and good reliability.

Automated summary

In this study, a hybrid nickel cobalt-layered double hydroxide/ functionalized halloysite nanotubes (NiCo-LDH/F-HNTs) composite was synthesized by a one-pot hydrothermal approach for the electrochemical detection of parathion. The modified electrode exhibited high electrochemical efficiency for parathion reduction compared to other electrodes. After parameter optimization, the NiCo-LDH/F-HNTs based electrochemical sensor showed excellent performance with a wide linear range, low detection limit, good selectivity, and reproducibility.