A novel bioconjugated reduced graphene oxide-based nanocomposite for sensitive electrochemical detection of cadmium in water

Herein, construction of an ecofriendly SnO2 nanoparticles@bioconjugated reduced graphene oxide' nanocomposite was reported, which was prepared through carbodiimide coupling between carboxyl groups of amino acid 'L-proline' and amino-functionalized reduced graphene oxide (H2N-rGO) followed by its anchoring to SnO2 nanoparticles. Furthermore, prepared nanocomposite modified electrode was applied for the selective and sensitive detection of cadmium (II) in water sample. Synergistic effect of SnO2 and bioconjugated reduced graphene oxide greatly enhanced the electrocatalytic efficiency of the electrode. Quantification of Cd (II) was recorded in a linear range of 0.001-0.4 ppm with limit of detection 1 x 10(-4) ppm and high sensitivity 67.43 mu A/ppm. Finally, real sample analysis was also performed using tap water and ground water samples with excellent recovery results.

Automated summary

An ecofriendly SnO2 nanoparticles@bioconjugated reduced graphene oxide nanocomposite was constructed for selective and sensitive detection of cadmium (II) in water samples. The synergistic effect of SnO2 and bioconjugated reduced graphene oxide significantly enhanced the electrocatalytic efficiency of the electrode, resulting in a linear quantification range of 0.001-0.4 ppm with a detection limit of 1 x 10(-4) ppm and sensitivity of 67.43 mu A/ppm. Real sample analysis using tap water and ground water samples showed excellent recovery results.