This　study　investigated　the　feasibility　of　using　okara　as　a　low-cost　adsorbent　for　the　removal　of　Reactive　Brilliant　Blue　KN-R　(RBB),　a　typical　reactive　dye,　from　aqueous　solution.　Batch　adsorption　experiments　were　conducted　to　evaluate　the　effects　of　pH,　adsorbent　dosage,　initial　dye　concentration,　and　temperature.　It　was　proved　that　strong　acidic　condition　was　favorable　for　the　adsorption　process　and　the　optimal　pH　was　2.0.　Langmuir-Freundlich　(L-F)　isotherm　fitted　well　with　the　equilibrium　data.　The　maximum　adsorption　capacity　determined　from　the　L-F　isotherm　was　68.67,　159.60,　and　402.58　mg/g　at　20,　35,　and　50　degrees　C,　respectively.　Kinetic　studies　showed　that　adsorption　of　RBB　followed　the　pseudo-second-order　kinetic　model,　both　boundary　layer　diffusion　and　intra-particle　diffusion　might　affect　the　adsorption　rate.　Thermodynamic　study　demonstrated　the　spontaneous　and　endothermic　natures　of　the　adsorption　process.　Fourier　transform　infrared　analysis　revealed　that　chemical　functional　groups　(e.g.　amine,　hydroxyl,　carboxyl,　phosphate,　and　ether)　on　okara　would　be　the　active　binding　sites　for　adsorption　of　RBB.　The　results　showed　that　okara　could　be　effectively　used　as　a　low-cost　and　alternative　adsorbent　for　the　removal　of　RBB　from　wastewater.