The electrocatalytic dechlorination of chloroacetic acids at electrodeposited Pd/Fe-modified carbon paper electrode

Electrochemical removal of haloacetic acids in a three-dimensional electrochemical reactor with Pd-GAC particles as fixed filler and Pd-modified carbon paper as cathode

“…The Pd-C electrode was prepared via our previously reported electrodeposition method (Li et al, 2012). The electrodeposition of Pd (0) was carried out by dipping the cleaned carbon paper in dichlorodiamminepalladium [Pd(NH 3 ) 2 Cl 2 ] complex (plating solution), composed of 1 mM palladium chloride (PdCl 2 ) and 10 mM ammonium chloride solution (Wang and Qu, 2006).…”

“…Specifically, palladium (Pd) catalysts were found to show good catalytic activity for degradation of halogenated organic compounds (HOCs) and they can operate efficiently within a broad range of pollutants concentration (Lingaiah et al, 1999;Mackenzie et al, 2006;Rego et al, 2010;Martinez et al, 2013). In our previous study, it was demonstrated that the Pd-C electrode prepared via electrodeposition showed higher activity in the dechlorination of chloroacetic acids than via impregnation and calcinations (Li et al, 2012). Some researchers have reported that dechlorination of HOCs at cathode surfaces may occur through both direct and indirect mechanisms (Li et al, 2012;Li and Farrell, 2000;Wang et al, 2010;De Pedro et al, 2011).…”

“…In our previous study, it was demonstrated that the Pd-C electrode prepared via electrodeposition showed higher activity in the dechlorination of chloroacetic acids than via impregnation and calcinations (Li et al, 2012). Some researchers have reported that dechlorination of HOCs at cathode surfaces may occur through both direct and indirect mechanisms (Li et al, 2012;Li and Farrell, 2000;Wang et al, 2010;De Pedro et al, 2011). It was observed that the presence of Pd(0) nanoparticles played a significant role in forming atomic H* to realize indirect reduction process which could achieve the complete dechlorination of chloroacetic acids (Li and Farrell, 2000).…”

“…The effect of coexisted ions on the performance of the electrochemical reactor was little investigated (Li et al, 2007;Altamar et al, 2010;Li et al, 2012). Besides, it has been recognized that the removal efficiency of the pollutants could be increased by use of three-dimensional electrode with extensive specific surface area in comparison to conventional two-dimensional electrodes (Kong et al, 2006;Mascia et al, 2012).…”

“…Pdmodified carbon paper (Pd-C) cathode was used as cathode, which was prepared from PdCl 2 via electrodeposition onto carbon paper (Li et al, 2012). GAC was used as support of catalysts because of its low cost, high surface area and high hydrodehalogenation activity (Wei et al, 2010).…”