Preparation of the Palladium/Polymeric Pyrrole-Multi-Walled Carbon Nanotubes Film/Titanium Electrode and Its Performance for the Dechlorination of 4-chlorophenol

Abstract

The electrochemically reductive dechlorination of 4-chlorophenol (4-CP) in aqueous solution on a palladium/polymeric pyrrole-multi-walled carbon nanotube film/meshed titanium electrode (Pd/PPyMWCNTs/Ti) was examined in this paper. The Pd/PPy-MWCNTs/Ti cathode was prepared through electrodepositing cauliflower-like palladium nanoparticles onto a PPy-MWCNTs/Ti electrode (that was a titanium electrode coated with pyrrole and functionalized multi-walled carbon nanotubes by codeposition). The physical properties of this electrode were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). Various factors influencing the dechlorination of 4-CP were also investigated. The results indicated that the removal rate of 4-CP reached 99.82% within 120 min and the current efficiency of 13.8% was obtained under the optimum conditions (the dechlorination density of 1.0 mA/cm 2 , the initial pH of 2.08 and the electrolyte of 0.1 mol/L Na 2 SO 4 ). The predominant product was phenol. In addition, the electrode was found to be still stable after being used for six cycles and the dechlorination efficiency was over 93.3%.

Rational Design and Structural Regulation of Robust Catalysts for Electrocatalytic Hydrodechlorination: From Nanostructures to Single Atoms

“…In earlier studies, Kulikov et al used carbon cloth as a support to prepare Pd/carbon cloth electrode for selective dechlorination of aliphatic hydrocarbons in an aqueous solution. 159 Jiang et al 120 prepared palladium/ polymeric pyrrole-multiwalled carbon nanotubes/titanium mesh composite electrode by electrodepositing palladium nanoparticles on multiwalled carbon nanotubes (MWCNTs)/conductive film composite electrode, and optimized the electrode preparation and electrocatalytic reaction conditions. The prepared electrode maintained good stability within six cycles, and the dechlorination rate was over 93.3%.…”

A Polypyrrole-Modified Pd-Ag Bimetallic Electrode for the Electrocatalytic Reduction of 4-Chlorophenol

“…The effect of different initial pH values (2.05, 2.30, 2.53, and 6.48) on the removal efficiency of 4-CP was investigated under a current of 6 mA and time of 90 min at room temperature. According to the existing literature [29,55], 4-CP exists in the form of negative ions and is repulsed by electrostatic force when the solution is alkaline, which will lead to a low removal efficiency. On the contrary, numerous H ads will be generated and occupy active sites on the electrode surface in an acidic solution.…”