Synergistically Enhanced Electrochemical Sensing of Bisphenol A in Real Water Samples at Carbon Nanotubes/-Cyclodextrin/Gold Nanoparticles Composite

Monitoring of bisphenol A (BPHA) is required as its release with byproducts into the aquatic environment every year, causes pollution and toxicity which affects the human health. An efficient electrochemical sensor is therefore needed to determine BPHA in water from natural resources. To construct the sensor, a thin layer of carbon nanotubes (CNTs) is applied to the surface of glassy carbon (GC) then beta-CD and Au-nano are sequentially electrodeposited. The performance of the sensor is optimized and shows excellent catalytic effect in wide concentration range 7 nM to 700 mu M with low detection limit of 5.02 nM compared to other cited modified electrodes. Each of the sensor constituents share in the enhancement of its performance; Au-nano has intrinsic surface electroactivity, beta-CD "host" allows for BPHA "guest" surface accumulation, and CNTs with large conductive surface area realize homogeneous distribution of the other two components. The advantages of the BPHA electrochemical sensor are simple to prepare, timesaving, and shows good sensitivity, stability, selectivity in presence of interfering ions and compounds, it is suitable for use with portable simple equipment for in situ measurements. Furthermore, the application of the sensor in wastewater samples shows good recovery of BPHA.