Removal　of　Co(II)　and　Mn(II)　ions　from　the　pure　terephthalic　acid　(PTA)　wastewater　onto　Na-bentonite　has　been　investigated　in　this　work.　Batch　experiments　were　performed　to　elucidate　the　effects　of　various　parameters,　such　as　dosage　of　adsorbent,　temperature,　and　initial　pH,　on　the　adsorption　process.　It　has　been　found　that　the　simulated　adsorption　process　of　the　pseudo-second-order　kinetic　model　was　in　better　agreement　with　experimental　results　than　that　of　the　pseudo-first-order　and　intra-particle　diffusion　kinetic　models.　Moreover,　the　adsorption　experiments　were　conducted　at　four　temperatures,　which　was　298.15,　308.15,　318.15,　and　328.15 K,　respectively,　with　the　initial　metal　concentrations　ranging　from　30　to　120 mg L−1,　so　as　to　study　the　adsorption　thermodynamics.　Compared　with　the　Freundlich　and　Dubinin–Radushkevich　models,　the　Langmuir　isotherm　model　agreed　better　with　experimental　data.　The　Gibb’s　free　energy　change　(ΔG),　enthalpy　change　(ΔH),　and　entropy　change　(ΔS)　of　the　adsorption　process　were　calculated　at　four　temperatures.　The　results　indicated　that　the　adsorption　process　was　endothermic　and　spontaneous.　When　the　adsorbent　concentration　was　3 g L−1,　the　adsorption　percentages　of　Co(II)　and　Mn(II)　can　be　attained　about　95.09　and　95.03%,　respectively.　Therefore,　it　can　be　concluded　that　Na-bentonite　could　be　used　as　an　efficient　adsorbent　to　remove　heavy　metal　ions　from　the　PTA　wastewater.　©　2015　Balaban　Desalination　Publications.　All　rights　reserved.