Calcium　silicate　hydrate(CSH)is　a　kind　of　important　heavy　metal　adsorbent,　which　plays　an　important　role　in　both　natural　self-purification　process　and　artificial　environmental　purification　and　restoration.Functionalization　of　CSH　ad-　sorbent　for　Fe3+　adsorption　can　achieve　reduction　and　detoxification　of　heavy　metal　Cr(Ⅵ).Firstly,　CSH　was　prepared　by　ex-　tracting　steel　slag　filtrate　from　an　acid　leaching　process　as　the　Ca　source　and　Na2SiO3•9H2O　as　the　Si　source.The　resulting　CSH　was　used　to　adsorb　Fe3+　metal　ions　by　ion　exchange　and　electrostatic　attraction.Subsequently,　by　using　thiourea　as　S　source,　the　CSH　adsorbent　loaded　by　Fe3+　was　hydrothermally　transformed　into　xFeS@CSH(x　was　the　initial　concentration　of　Fe3+,　mg/L).When　the　mass　concentration　of　Fe3+　was　150　mg/L,　150FeS@CSH　sample　possessed　the　best　Cr(Ⅵ)reduc-　tion　property.When　pH=2,　the　reduction　conversion　rate　of　Cr(Ⅵ)(10　mg/L,　60　mL)could　reach　100%　after　4　minutes　of　reaction.Meanwhile,　by　adjusting　the　pH　of　the　solution　and　reaction　time(pH=3,　reaction　time　of　30　min),　Cr(Ⅲ)fixation　and　total　Cr　removal　could　also　be　achieved.The　active　FeS　phase　achieved　Cr(Ⅵ)reduction,　and　with　the　increase　of　solu-　tion　pH,　the　reduction　product　Cr　(Ⅲ)was　fixed　on　the　material　surface　in　the　form　of　Cr(OH)3,　Cr2O3,　etc.　©　2025　Editorial　Office　of　Inorganic　Chemicals　Industry.　All　rights　reserved.