A　new　eco-friendly　adsorbent　(ACKGM)　derived　from　konjac　glucomannan　was　prepared　and　used　for　Cr(VI)　adsorption　from　aqueous　solution.　The　ACKGM　was　synthesized　by　amino-modification　of　cross-linked　konjac　glucomannan　through　nucleophilic　substitution　approach.　The　adsorbent　was　characterized　by　scanning　electron　microscopy　and　Fourier　Transform　Infrared　spectroscopy.　The　ACKGM　possessed　property　of　fast　adsorption　and　over　92%　of　Cr(VI)　was　adsorbed　in　the　first　10　min.　The　adsorption　equilibrium　was　reached　in　45　min.　The　ACKGM　removed　99.98%–85.93%　of　Cr(VI)　when　initial　Cr(VI)　concentration　varied　in　20–150　mg/L.　It　was　found　the　absorption　depended　on　pH　and　the　optimum　adsorption　took　place　at　pH　=　2.　The　maximum　adsorption　capacity　was　34.1　mg/g,　when　the　dosage　of　ACKGM　was　2.0　g/L　at　30　°C.　The　adsorption　kinetics　followed　the　pseudo-second　order　kinetics　equation　and　the　activation　energy　(Ea)　of　the　adsorption　was　32.72　kJ/mol.　Different　isotherm　models　were　used　to　analyze　the　isotherms　of　the　adsorption.　The　adsorption　isotherms　fitted　best　with　the　Redlich–Peterson　isotherm　equation.　The　enthalpy　change　(ΔH0)　of　adsorption　was　−　23.21　kJ/mol.　The　thermodynamic　parameters　showed　the　adsorption　of　Cr(VI)　onto　ACKGM　was　a　spontaneous　and　exothermic　process.　The　adsorption　mechanism　study　showed　that　electrostatic　attraction,　affinity　interaction　and　polymer　inclusion　and　net　trapping　mechanisms　were　involved　in　the　process.　The　present　study　suggests　that　the　ACKGM　is　an　effective　adsorbent　for　the　removal　of　Cr(VI)　from　aqueous　solution.　©　2017　Elsevier　B.V.