Silicate-based　catalysts　have　become　the　focus　of　current　research　because　of　their　green,　low-cost　and　stable　characteristics.Sodium　ferric　silicate(NaFeSi2O6,　SFS)is　a　chain　silicate　with　simple　composition　and　ability　to　absorb　vis-　ible　light,　which　has　attracted　people＇s　attention.Firstly,　the　original　SFS　powder　was　synthesized　by　hydrothermal　method,　and　then　the　microstructure　and　Fe(Ⅲ)/Fe(Ⅱ)ratio　of　the　SFS　surface　were　regulated　by　thermal　reduction　process　to　pre-　pare　the　optimal　modified　SFS　for　Cr(Ⅵ)reduction.It　was　found　that　after　thermal　reduction　at　200　℃,　the　specific　surface　area　of　SFS-200　was　increased　by　43%,　the　pore　volume　was　increased　to　0.081　cm3/g,　and　the　proportion　of　Fe(Ⅱ)was　in-　creased　from　33%　to　45%,　significantly　improving　its　catalytic　reduction　activity　towards　Cr(Ⅵ).Meanwhile,　the　effects　of　SFS-200　catalyst　dosage,　reduction　time,　oxalic　acid　promoter　dosage,　Cr(Ⅵ)concentration,　and　other　factors　on　catalytic　performance　were　investigated.It　was　found　that　Fe(Ⅱ)-C2O4•-　was　the　main　active　substance　in　the　catalytic　system,　main-　taining　the　chemical　cycle　of　Fe(Ⅲ)-Fe(Ⅱ)to　enhance　the　efficient　photo　reduction　removal　ability　of　Cr(Ⅵ)by　SFS-200.This　study　provided　an　effective　way　to　prepare　high-performance　sodium　ferric　silicate　photocatalyst　for　Cr(Ⅵ)waste-　water　purification,　which　had　great　potential　for　application.　©　2024　Editorial　Office　of　Inorganic　Chemicals　Industry.　All　rights　reserved.