The　efficient　uptake　of　phosphate　from　aqueous　solutions　was　achieved　on　layered　double　hydroxides　(LDHs)-based　electrodes　via　capacitive　desalination　in　our　previous　study.　The　current　follow-up　work　was　mainly　carried　out　to　study　the　influence　of　various　experimental　parameters　on　the　capacitive　removal　of　phosphate　using　LDHs/activated　carbon　(LDHs/AC)　composite　electrodes.　A　series　of　batch　experiments　were　implemented　to　investigate　the　experimental　factors,　including　Mg2+/Al3+　ratios　(2,　3,　and　4),　trivalent　metal　cations　(Al3+,　Fe3+,　Cr3+),　initial　solution　pH　(from　3　to　10),　coexisting　anions　(NO3−,　Cl−,　SO42−),　and　ion　strengths,　in　capacitive　deionization.　The　electrode　materials　before　and　after　capacitive　deionization　were　characterized　to　reinforce　the　analysis　of　the　adsorption　mechanisms　by　X-ray　powder　diffraction,　scanning　electron　microscopy,　energy　dispersive　X-ray,　cyclic　voltammetry,　and　electrochemical　impedance　spectroscopy.　Results　indicated　that　the　Mg-Al　LDHs/AC　electrodes　exhibited　higher　phosphate　adsorption　capacity　(80.43　mg　PO43−/g),　more　regular　morphology,　and　higher　degree　of　crystallinity　than　that　of　Mg-Fe　LDHs/AC　and　Mg-Cr　LDHs/AC.　Increasing　Mg2+/Al3+　ratios　enhanced　the　adsorption　capacity　of　phosphate.　The　uptake　of　phosphate　by　Mg-Al　LDHs/AC　under　circumneutral　pH　and　low　ion　strength　reached　the　maximum　level.　Furthermore,　the　presence　of　coexisting　anions　lowered　the　adsorption　capacity　of　phosphate　mainly　due　to　the　occurrence　of　a　compressed　electrical　double　layer.　Therefore,　the　influence　of　different　experimental　parameters　on　phosphate　removal　via　capacitive　deionization　by　Mg-Al　LDHs/AC　necessitates　a　systematic　investigation　to　optimize　the　preparation　conditions　of　LDHs-based　electrodes　and　several　important　operating　parameters.　©　2019