A　novel　adsorbent,　biodegradable　Konjac　glucomannan-poly(acrylic　acid)　(KGMP)　hydrogel,　is　prepared　by　Konjac　glucomannan　grafting　with　acrylic　acid.　The　adsorption　properties　of　the　KGMP　for　Cu(II)　ion　removal　from　aqueous　solutions　are　investigated.　The　experiments　are　performed　under　various　impact　factors　such　as　initial　Cu(II)　ion　concentration,　pH,　contact　time,　temperature　and　salt　ionic　strength.　The　Langmuir　and　Freundlich　isotherm　are　employed　to　discuss　the　adsorption　behavior.　The　result　shows　the　equilibrium　data　obtained　at　different　temperatures　are　represented　perfectly　by　Langmuir　isotherm　model　compared　to　the　Freundlich　isotherm　models.　The　monolayer　saturation　adsorption　capacities　of　KGMP　for　Cu(II)　ion　is　found　to　be　27.1739,　30.2115,　34.1297　and　41.6667　mg　g(-1)　at　298,　303,　308　and　313　K,　respectively.　Thermodynamic　parameters　such　as　Delta　G,　Delta　H　and　Delta　S　are　calculated.　The　kinetics　studies　show　that　adsorption　process　follows　the　pseudo-second-order　model　and　the　adsorption　process　is　mainly　controlled　by　both　surface　reactivity　and　intra-particle　diffusion.　FT-IR　analysis　shows　that　a　large　number　of　carbonyl,　ester,　and　hydroxyl　groups　are　included　in　the　external　surface　of　the　KGMP,　SEM　indicates　that　the　rough,　irregular　and　pores　of　different　size　and　shapes　on　surfaces　of　the　KGMP　are　observed　before　adsorption.　The　present　study　indicates　that　the　KGMP　is　an　effective　adsorbent　for　the　removal　of　Cu(II)　ion　from　aqueous　solutions.