Experiments　were　conducted　to　assess　the　practical　utility　of　the　spherical　sulfonic　lignin　adsorbent　(SSLA).　The　adsorption　isotherm　for　the　adsorbed　L-arginine　on　the　SSLA　was　analyzed　using　Langmuir　isotherm.　The　change　in　apparent　enthalpy,　free　energy,　and　entropy　of　adsorption　were　also　calculated.　The　value　of　free　energy　was　observed　to　be　negative　and　was　found　to　decrease　with　increasing　temperature.　The　results　indicate　that　the　adsorption　process　is　endothermic　and　is　temperature　dependent.