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In this work, a novel nanosheets assembled porous fusiform Co 2 P 2 O 7 were successfully synthesized using a facile one-step hydrothermal method for ultrasensitive electrochemical sensing of As(III) in water. The unique porous structure and good dispersion facilitate a well-connected electron transfer path and provide numerous electroactive sites to bind with As(III). [Display omitted] • A novel nanosheets assembled porous fusiform Co 2 P 2 O 7 were successfully synthesized. • The porous fusiform Co 2 P 2 O 7 for the detection of As(III) by DPV was studied. • The proposed As(III) sensor exhibited a high sensitivity and low detection limit. • The reproducibility, stability and selectivity of the sensor are excellent. A facile and low-cost method was used to synthesize a novel nanosheets assembled porous fusiform Co 2 P 2 O 7 for ultrasensitive electrochemical sensing detection of As(III) in water. The porous fusiform Co 2 P 2 O 7 formed by small nanosheets exhibits a three-dimensional porous structure with a rough surface and good dispersion, facilitating a well-connected electron transfer path and providing numerous electroactive sites to bind with As(III). The proposed electrochemical sensor exhibited a high sensitivity of 91.04 µA µg/L cm−2 and a low detection limit of 0.087 µg/L towards As(III) in 0.1 M HAc-NaAc buffer (pH 5.0). Furthermore, it exhibited great potential for the electrochemical detection of As(III) in tap water. [ABSTRACT FROM AUTHOR]

In this review, the research progress of various kinds of nanomaterials for high performance of electrochemical HMI sensors were summarized in detail. The synthesis strategies, advantages, performance and challenges of the various nanomaterials for application in electrochemical HMI sensors are discussed. [Display omitted] • Deep insights into nanomaterials-based electrochemical HMI sensors were discussed. • Recent advances of electrochemical HMI sensing modified nanomaterials are reviewed. • The design ideas, innovations and merits of the modified materials were discussed. • Remaining challenges and prospects of the modified nanomaterials were presented. As one of the main pollutants, heavy metal ions can accumulate in the human body and cause a cascade of damage. Electrochemical sensors provide great prospects for tracing heavy metal ions because of their properties of high sensitivity, low detection limits and fast response. Electrode surface modification materials play a key role in enhancing the performance of electrochemical sensors. Herein, we summarize in detail the recent work on electrochemical sensors modified by carbon nanomaterials (graphene and its derivatives, carbon nanofibers and carbon nanotubes), metal nanomaterials (gold, silver, bismuth and iron), complexes (MOFs, ZIFs and MXenes) and their composites for the detection of heavy metal ions (mainly include Cd(II), Hg(II), Pb(II), As(III), Cu(II) and Zn(II)) in food and water. The synthetic strategies, mechanisms, innovations, advantages, challenges and prospects of various electrode modification nanomaterials for the detection of heavy metal ions in food and water are discussed. [ABSTRACT FROM AUTHOR]