In　this　study,　the　adsorptive　removal　of　methylene　blue　from　aqueous　solution　was　carried　out　by　Zr-containing　metal-organic　frameworks　(MOFs).　UiO-66,　prototypes　of　MOFs,　was　used　as　an　adsorbent　with　or　without　functionalization　of　free　amino　groups.　Although　the　porosity　and　surface　area　of　the　functionalized　UiO-66　(UiO-66-NH2)　were　smaller　than　that　of　the　original　UiO-66,　its　adsorption　capacity　for　methylene　blue　increases　significantly　with　the　functionalization.　The　improvement　of　the　performance　of　UiO-66-NH2　can　be　attributed　to　electrostatic　interaction　between　the　cationic　dye　and　the　negatively　charged　surface　of　adsorbent,　which　is　helpful　for　the　adsorption　of　methylene　blue.　In　order　to　study　the　adsorption　characteristics,　the　effects　of　various　operating　parameters　such　as　adsorbent　dosage,　shaking　speed,　pH,　initial　concentration　of　methylene　blue,　and　temperature　were　investigated　in　a　batch　adsorption.　The　adsorption　isotherm　and　kinetic　data　of　methylene　blue　onto　UiO-66-NH2　are　best　fitted　by　Redlich-Peterson　and　Elovich　models,　respectively.　The　adsorption　process　is　an　exothermic　and　of　the　multilayer　variety.　Thermodynamic　parameters　such　as　Delta　G,　Delta　H,　and　Delta　S　were　determined,　which　indicate　that　the　adsorption　process　endothermic　and　spontaneous.　Moreover,　the　UiO-66-NH2　adsorbent　can　be　easily　regenerated　and　reused　by　ethanol　as　eluent　and　the　adsorption　capacity　decreases　by　only　7.6%　after　five　adsorption-desorption　cycles.　Therefore,　MOFs　functionalized　with　basic　site,　such　as　UiO-66-NH2,　can　be　employed　as　an　environmentally　friendly　adsorbent　for　the　methylene　blue　removal　from　wastewater.