Environmental　protection　has　become　a　pressing　concern　for　numerous　countries,　with　waste-to-waste　strategies　at　the　forefront.　This　study　demonstrated　the　successful　fabrication　of　bifunctional　magnetic　microspheres　for　arsenic　remediation　using　waste　iron　sludge　as　precursor　material.　The　synthesized　material　exhibited　a　monodisperse　particle　size　distribution　ranging　from　300　to　500　μm,　with　a　saturation　magnetization　of　22　emu/g　ensuring　efficient　magnetic　recovery.　Maximum　arsenic　adsorption　capacities　of　21.99,　21.63,　and　14.2　mg/g　were　observed　at　pH　5.7,　7.0,　and　9.0,　respectively,　while　stable　adsorption　performance　persisted　across　a　broad　pH　range　(2−10).Kinetic　analysis　revealed　close　adherence　to　the　pseudo-second-order　model　(R²　＞　0.99),　complemented　by　Freundlich　isotherm　fitting　suggesting　multilayer　adsorption.　Notably,　the　28.6　%　reduction　in　zeta　potential　post-adsorption,　coupled　with　enhanced　adsorption　capacity　at　elevated　ionic　strength,　confirmed　predominance　of　chemisorption　processes　through　inner-sphere　complexation　mechanisms.　Competitive　adsorption　experiments　showed　that　carbonate,　silicate,　and　phosphate　ions　substantially　inhibited　As(V)　removal　through　ligand　competition,　while　chloride,　nitrate,　and　sulfate　exhibited　negligible　effects.　The　material　retained　76　%　removal　efficiency　after　5　regeneration　cycles,　demonstrating　remarkable　environmental　adaptability　and　engineering　application　potential.　Consequently,　MCMB　emerged　as　an　efficient　adsorbent　for　arsenic　removal.　©　2025