3-Chlorophenol

Abstract: In the present paper, a β-cyclodextrin (β-CD) functionalized graphene modified carbon paste electrode (CD/GRs/CPE) was prepared and characterized by atomic force microscopy (AFM), Fourier transform infrared (FT-IR) and electrochemical impedance spectroscopy (EIS). The electrochemical behaviors of 2-chlorophenol (2-CP) and 3-chlorophenol (3-CP) on different electrodes were investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The results demonstrated that the CD/GRs/CPE exhibited remarkable enhancement effects towards these two chlorophenols, especially for 3-CP. Importantly, their oxidation peaks could be well separated by CVs and DPVs. Under the optimized conditions, the oxidation peak currents displayed a good linear relationship to concentration in the ranges from 0.5 to 40 μM for 2-CP and 0.4 to 77 μM for 3-CP, with detection limits of 0.2 and 0.09 μM, respectively. As a practical application, the proposed sensor was applied to quantitatively determine 2-CP and 3-CP in water samples with satisfying results.

Abstract: A commercial multiwall carbon nanotube and its carboxylated derivate (CNTC and COOHC, respectively) was used after purification to study the competitive adsorption of phenol (P) and m-chlorophenol (CP) from 0.1 M aqueous NaCl solutions without external pH control. The adsorption takes place practically exclusively on the external surface of the nanotubes. The uptake of P is suppressed in comparison to its single solute behaviour on both nanotubes, independently of the initial pollutant concentration. The uptake of CP however is more sensitive to the concentration and the surface chemistry of the nanotube. The measured co-adsorption isotherms were compared to the isotherms calculated from the competitive Langmuir model (CLM). Preferential adsorption of CP was observed in about 95% of the relative concentration range. The total adsorption may exceed the corresponding single component sorption capacity.