Landfill　leachate　nanofiltration　concentrates　(LLNC)　contain　complex　organic　pollutants　that　are　difficult　to　treat.　This　study　developed　a　copper-doped　attapulgite-chitosan　composite　catalyst　(Cu@ATP-CTS)　for　efficient　LLNC　degradation　in　a　Fenton-like　system.　The　incorporation　of　attapulgite　extended　the　effective　pH　range　of　Fenton　reactions　from　2　to　8,　overcoming　traditional　limitations.　Optimized　via　response　surface　methodology,　the　catalyst　achieved　89.02%　UV254　removal,　73.86%　COD　removal,　and　77.24%　TOC　removal　within　115　min　under　optimal　conditions.　Copper　played　a　crucial　role　in　H2O2activation,　cycling　between　Cu0,　Cu+,　and　Cu2+　to　generate　hydroxyl　radicals　(&　sdot;OH),　the　key　species　driving　pollutant　degradation.　The　Cu@ATP-CTS　catalyst　also　demonstrated　strong　stability　and　reusability　over　five　cycles.　This　study　provides　a　robust　and　sustainable　method　for　LLNC　treatment,　offering　significant　potential　for　application　in　landfill　leachate　and　wastewater　management.