Au nanoparticle-loaded eggshell for electrochemical detection of nitrite

Eggshell is an extremely large source of domestic waste and has a huge scientific research potential because of its unique porous hierarchical structure. By converting eggshell waste into valuable functional materials, it can be recycled in many fields. Herein, we envisioned an economical and environmentally friendly conversion method for synthesizing Au nanoparticle loaded eggshell nanocomposites (defined as Au/CaCO3 nanocomposites) for the detection of trace amounts of nitrite in oolong tea. Compared with bare electrodes, the prepared Au/CaCO3 nanocomposite-based electrodes have obvious electrochemical enhancement behavior. A wide linear response range of 0.01 to 1.00 mM and a relatively low detection limit of 11.55 nM have been obtained in this study. The turning waste into treasure transformation strategy not only provides a practical and low-cost method for comprehensive utilization of eggshells as valuable functional materials, but also provides a new approach for sensitive detection of pollutants.

Automated summary

Eggshell waste is a large domestic waste source with significant scientific research potential. In this study, an economical and environmentally friendly method was proposed to synthesize Au nanoparticle loaded eggshell nanocomposites for the detection of trace amounts of nitrite in oolong tea. The strategy of turning waste into treasure not only provides a practical method for the comprehensive utilization of eggshells as valuable functional materials, but also offers a new approach for sensitive detection of pollutants.