Electrocatalytic response of p-nitrophenol at a β-cyclodextrin incorporated carbon nanotube modified electrode

β-cyclodextrin (β-CD)/multi-walled carbon nanotube (MWCNT) composite was prepared by the electrostatic self-assembly method. The electrochemistry catalytic effects of pH, scanning rate, catalytic time, raw material ratio and concentration of liquid on the glassy carbon electrode coated with β-CD/MWCNTs composite were studied by cyclic voltammetry. The experimental results showed that the electrochemistry catalytic effect of β-CD/MWCNT composite on the p-nitrophenol was obvious, and it was controlled by the surface process. The optimum catalytic conditions were determined, potassium hydrogen phthalate as buffer solution, quiet time of 40 s, the mass ratio of carbon nanotubes and β-CD was 1:3. The electrochemical determination method of p-nitrophenol using a glassy carbon electrode coated with a β-CD/MWCNTs composite was developed by differential pulse voltammetry. The results indicated that the redox peak currents of p-nitrophenol were linear while the p-nitrophenol concentration range was from 1.3×10^-6 to 3.5×10^-4 mol/L, and the linear coefficient of the redox peak current was 0.9985 and the detection limit was 1.233×10^-7 mol/L.