A　series　of　iron-based　nanocomposites　such　as　Cu-Fe　(CFNCs),　Ni-Fe　(NFNCs),　Ag-Fe　(SFNCs)　and　Al-Fe　(AFNCs)　were　fabricated　via　sol-gel　route.　An　extensive　investigation　about　crystallinity,　microstructure,　electrical　and　optical　properties　was　carried　out　by　utilizing　X-ray　diffractometer　(XRD),　diffuse　reflectance　spectroscopy　(DRS),　X-ray　photoelectron　spectroscopy　(XPS),　Brunauer-Emmett-Teller　(BET)　and　scanning　electron　microscopy　(SEM).　The　frequency-dependent　AC　conductivity,　dielectric　constant　and　dielectric　loss　were　measured　in　the　frequency　range　of　25　kHz-2　MHz　at　room　temperature　via　an　LCR　meter.　The　highest　conductivity　similar　to　2.85　x　10(-7)S/m　was　revealed　by　AFNCs　as　compared　to　other　nanocomposites.　The　Maxwell-Wagner　model　for　induced　polarization　and　Koop＇s　phenomenological　theory　of　dielectrics　were　followed　by　all　the　fabricated　nanocomposites　in　the　temperature　range　of　30-600　degrees　C.　The　maximum　dielectric　constant　similar　to　930　was　measured　for　AFNCs　at　a　temperature　of　200　degrees　C.　Furthermore,　the　synthesized　nanocomposites　effectively　degraded　a　toxic　organic　dye　Rhodamine　B　(RhB)　and　the　degradation　(%)　similar　to　77,　85,　86,　and　87　within　the　time　of　50,　40,　50　and　70　min　was　recorded　for　CFNCs,　NFNCs,　SFNCs　and　AFNCs,　respectively.　Graphic　abstract