The　electrochemically　reductive　dechlorination　of　2,4-dichlorophenol　(2,4-DCP)　in　aqueous　solution　on　palladium/polymeric　pyrrole-cetyl　trimethyl　ammonium　bromide/foam-nickel　electrode　(Pd/PPy-CTAB/foam-Ni　electrode)　was　investigated　in　this　paper.　Pd/PPy-CTAB/foam-Ni　electrode　was　prepared　and　characterized　by　cyclic　voltammetry　(CV),　scanning　electron　microscope　(SEM),　X-ray　diffraction　(XRD),　Brunauer-Emmett-Teller　(BET)　adsorption　and　inductively　coupled　plasma-atomic　emission　spectroscopy　(ICP-AES).　The　influences　of　some　experimental　factors　such　as　the　dechlorination　current,　dechlorination　time　and　the　initial　pH　on　the　removal　efficiency　and　the　current　efficiency　of　2,4-DCP　dechlorination　on　Pd/PPy-CTAB/foam-Ni　electrode　were　studied.　Complete　removal　of　2,4-DCP　was　achieved　and　the　current　efficiency　of　47.4%　could　be　obtained　under　the　conditions　of　the　initial　pH　of　2.2,　the　dechlorination　current　of　5　mA　and　the　dechlorination　time　of　50　min　when　the　initial　2,4-DCP　concentration　was　100　mg　L-1.　The　analysis　of　high　performance　liquid　chromatography　(HPLC)　identified　that　the　intermediate　products　were　2-chlorophenol　(2-CP)　and　4-chlorophenol　(4-CP).　The　final　products　were　mainly　phenol.　Its　further　reduction　product　cyclohexanone　was　also　detected.　The　electrocatalytic　dechlorination　pathways　of　2,4-DCP　on　Pd/PPy-CfAB/foam-Ni　electrode　were　discussed.　The　stability　of　the　electrode　was　favorable　that　it　could　keep　dechlorination　efficiency　at　100%　after　having　been　reused　10　times.　Results　revealed　that　the　stable　prepared　Pd/PPy-CTAB/foam-Ni　electrode　presented　a　good　application　prospect　in　dechlorination　process　with　high　effectiveness　and　low　cost.　(C)　2012　Elsevier　B.V.　All　rights　reserved.