In　this　study,　chitosan　and　iron-containing　water　treatment　residues　were　used　to　prepare　a　chitosan/Fe-sludge　particle　adsorbent　(CHFS)　via　the　embedding　method　for　Sb(III)　removal.　Various　technologies　were　applied　to　characterize　the　CHFS,　and　batch　experiments　were　used　to　investigate　its　adsorption　properties.　The　results　show　that　CHFS　adsorbents　are　amorphous　and　have　a　specific　surface　area　(119.95　m2/g),　both　beneficial　for　adsorption.　pH　and　ionic　strength　have　no　impact　on　the　adsorption.　Sb(III)　adsorption　on　CHFS　occurs　spontaneously　and　endothermically.　Sb(III)　adsorption　by　CHFS　matches　the　pseudo-second-order　kinetic　model　and　the　Langmuir　model　better,　with　a　maximum　adsorption　capacity　of　24.38　mg/g.　The　primary　adsorption　mechanism　for　Sb(III)　is　the　inner　sphere　complexation　between　the　Sb　and　Fe-O　bond,　while　other　adsorption　mechanisms　include　chelation,　pore　filling,　and　hydrogen　bonding.　This　study　offers　a　reference　for　antimony　removal　and　resource　utilization　of　iron　sludge.