90Sr　has　a　long　half-life,　strong　radioactivity,　and　high　mobility.　The　removal　of　radioactive　strontium　from　the　water　environment　is　of　great　significance　to　human　safety　and　the　sustainable　development　of　nuclear　energy.　In　this　study,　a　two-dimensional　rare　earth　phosphate　K3Nd(PO4)2　efficiently　captured　Sr2+　ions　in　aqueous　solutions.　At　room　temperature,　the　adsorption　isotherm,　kinetics,　and　pH　dependence　experiments　of　K3Nd(PO4)2　for　Sr2+　ions　were　examined　(V/m　=　1000　mL/g,　12　h　contact　time).　The　experimental　results　show　that　the　maximum　adsorption　capacity　of　K3Nd(PO4)2　for　Sr2+　(qmSr)　was　42.35　mg/g.　The　removal　efficiency　for　Sr2+　(RSr)　was　87.47%　within　24　h.　It　had　a　good　affinity　with　Sr2+　ions　in　neutral　or　even　high　alkaline　environments　(distribution　coefficient　KdSr　=　1.46　×　106　mL/g,　RSr　=　99.93%).　The　adsorption　mechanism　was　attributed　to　the　ion　exchange　between　Sr2+　and　K+　ions　by　batch　adsorption　experiments　combined　with　multiple　characterizations,　including　XPS,　EDS,　and　PXRD.　This　is　the　first　report　of　Sr2+　removal　by　ion　exchange　via　rare　earth　phosphate　materials　with　a　two-dimensional　structure.　This　work　provides　insight　into　the　future　development　of　rare　earth　phosphates　as　ion　exchange　materials　for　radionuclide　remediation.　©　2022　by　the　authors.