A　lignin-based　composite,　PANI-EHL,　was　prepared　in　a　facile　manner　from　enzymatic　hydrolysis　lignin　(EHL)　and　aniline.　The　effects　of　initial　pH　value,　biosorbent　concentration,　sorption　time,　and　initial　adsorbate　concentration　on　the　biosorption　of　Au(III)　ions　onto　PANI-EHL　composite　were　investigated.　The　results　showed　that　the　biosorbent　exhibited　high　biosorption　of　Au(III)　ions.　The　PANI-EHL　composite　favored　treatment　of　Au(III)　ions　with　concentrations　below　2　mmol　L-1　with　an　adsorptivity　of　100%.　The　maximum　biosorption　capacity　and　adsorptivity　for　Au(III)　ions　were　up　to　4193.0　mg　g-1　and　70.9%,　respectively,　at　a　Au(III)　ion　concentration　of　20　mmol　L-1　at　30　C.　Furthermore,　the　biosorption　of　Au(III)　ions　was　found　to　be　a　redox　sorption　process,　as　confirmed　by　XRD,　TEM,　and　FTIR　and　UV-vis　spectroscopic　analyses　of　the　biosorption　product.　The　sorption　kinetic　and　equilibrium　data　were　described　well　with　the　pseudo-second-order　model　and　the　Freundlich　isotherm　model,　respectively,　for　the　Au(III)　ion　biosorption　process.　©　2013　American　Chemical　Society.