Synthesis and characterization of gold nanoparticles incorporated bentonite clay for electrocatalytic sensing of arsenic(III)

Journal of Chemical Sciences

Pankaj Kumar Rastogi¹  Rupali Gupta¹  Piyush Kumar Sonkar¹  Vellaichamy Ganesan1²  Dharmendra Kumar Yadav¹  Shruti Pandey¹ 

[1] $$;Department of Chemistry, Center of Advanced Study, Faculty of Science, Banaras Hindu University, Varanasi 221 005, UP, India$$

关键词: Bentonite clay;    gold nanoparticles;    arsenite oxidation;    electrocatalysis;    oxidative determination.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

In the present manuscript, a simple and easy route to synthesize bentonite (bt) clay-supported goldnanoparticles (Au NPs) is reported (represented as Au-bt).Application of this new environmentally benignmaterial in electrocatalytic determination of arsenite (As(III)) was studied. The successful synthesis and incorporation of Au NPs into the bt clay is supported by spectroscopic, microscopic and electrochemical methods.The synthesized Au-bt material was used to modify glassy carbon electrode (GC) by the evaporation of Au-btaqueous suspension dropped on the surface of the GC (GC/Au-bt).Cyclic voltammetry and chronoamperometry studies of As(III) solutions were performed with this GC/Au-bt electrode which act as efficient platform forthe electro-oxidation of As(III) to As(V) at a very low overpotential. Kinetic parameters were evaluated for theoxidation of As(III) at the GC/Au-bt platforms.A wide linear calibration range for the determination of As(III)from 1 to 1700 μM was obtained with high reproducibility and stability. A limit of detection, 0.1 μM wasachieved with high sensitivity.Additionally, it showed a good selectivity for the determination of As(III) in thepresence of copper(II) and other interfering ions suggesting a promising new route for trace level determinationof As(III) in neutral conditions.

【 授权许可】

Unknown