Efficient　removal　of　p-arsanilic　acid　(p-ASA)　from　contaminated　water　is　crucial　for　mitigating　arsenic　contamination.　In　this　study,　a　membrane　adsorbent　named　CFM-Zn　is　developed　by　retanning　Zn　on　a　collagen　fiber　membrane　(CFM).　This　development　leverages　the　unique　physicochemical　properties　of　CFM　and　the　strong　affinity　of　Zn　for　p-ASA.　The　membrane　is　composed　entirely　of　green,　low-carbon,　and　recyclable　materials,　achieving　sustainable　removal　of　p-ASA　and　embodying　the　concept　of　using　waste　to　treat　waste　for　environmental　recovery.　Remarkably,　it　exhibits　an　ultra-high　capacity　of　up　to　515.46　mg·g-1.　Additionally,　CFM-Zn　demonstrates　moderate　reusability,　with　effectiveness　maintained　for　at　least　five　cycles.　This　study　could　advance　the　development　of　bio-based　materials　for　water　pollutant　removal,　expand　the　applications　of　leather　waste,　and　significantly　promote　environmental　purification　and　resource　recycling.　©　2025　Elsevier　Ltd.　All　rights　are　reserved,　including　those　for　text　and　data　mining,　AI　training,　and　similar　technologies.