Water　pollution　caused　by　the　highly　toxic　metal　hexavalent　chromium　(Cr(VI))　creates　significant　human　health　and　ecological　risks.　In　this　study,　a　novel　adsorbent　was　used　to　treat　Cr(VI)-containing　wastewater;　the　adsorbent　was　prepared　using　redmud　(RM)　generated　from　the　alumina　production　industry　and　the　rare　earth　element　lanthanum.　This　study　explored　adsorption　performance,　kinetics,　and　mechanisms.　Results　showed　that　the　adsorption　kinetics　of　the　RM　modified　by　lanthanum　(La-RM),　followed　the　pseudo-second-order　model,　with　a　rapid　adsorption　rate.　Cr(VI)　adsorptionwas　positively　associated　with　the　absorbent　dose,　pH,　temperature,　and　initial　Cr(VI)　concentration;　coexisting　anions　had　little　impact.　The　maximum　Cr(VI)　adsorption　capacity　was　17.35　mg/g.　Cr(VI)　adsorption　on　La-　RM　was　a　mono-layer　adsorption　pattern,　following　the　Langmuir　isotherm　model.　Thermodynamic　parameters　showed　the　adsorptionwas　spontaneous　and　endothermic.　The　adsorption　of　Cr(VI)　on　La-RM　occurred　as　a　result　of　LaOCl　formation　on　the　RM　surface,　which　in　turn　further　reacted　with　Cr(VI)　in　the　wastewater.　This　study　highlighted　a　method　for　converting　industrial　waste　into　a　valuable　material　for　wastewater　treatment.　The　novel　absorbent　could　be　used　as　a　potential　adsorbent　for　treating　Cr(VI)contaminating　wastewater,　due　to　its　cost-effectiveness　and　high　adsorption　capability.