A　novel　1-propylene-3-methylimidazolium　chloride　([AMIM]Cl)　ionic　liquid-functionalized　Mg/Al　layered　double　hydroxide　(IL-LDH)　was　synthesized　via　a　thiol-ene　click　reaction　and　applied　to　adsorb　Congo　Red　(CR)　from　aqueous　solution.　The　structure　of　the　prepared　adsorbent　was　characterized　mainly　using　X-ray　diffraction　(XRD),　infrared　spectrum　(IR),　thermogravimetric　analysis　(TGA),　and　N2　Brunauer-Emmett-Teller　surface　area　measurements.　Batch　adsorption　experimental　factors　including　initial　pH,　the　amount　of　adsorbent　and　adsorption　time　were　investigated.　Under　optimal　conditions,　the　maximum　adsorption　capacity　of　CR　on　IL-LDH　was　288.63　mg·g−1,　which　was　higher　than　that　of　Mg-Al-LDHs　intercalated　with　sodium　dodecylsulfate　(LDH-SDS)　(90.86　mg·g−1).　In　addition,　the　adsorption　of　CR　on　IL-LDH　had　no　obvious　change　when　initial　pH　values　were　changed　from　5.0　to　10.0,　which　indicated　the　adsorbent　was　pH-independent.　Based　on　the　above　results,　ionic　liquid-modified　layered　double　hydroxide　may　constitute　a　potential　adsorbent　for　water　purification.　©　2018　Elsevier　Ltd