Mixed　metal　oxide　nanocomposites　(NCs)　comprising　Cu-Sr　(CS),　Sr-Cd　(SC),　and　Cd-Cu　(CC)　were　fabricated　via　a　sol-gel　method.　Structural　investigations　of　fabricated　samples　were　carried　out　via　X-ray　diffraction　(XRD),　scanning　electron　microscopy　(SEM),　diffuse　reflectance　spectroscopy　(DRS),　and　X-ray　photoelectron　spectroscopy　(XPS).　The　Maxwell-Wagner　model,　attributing　to　poor　conducting　layers　around　the　conducting　grains,　was　indicated　to　be　followed　by　all　of　the　NCs　while　investigating　the　dielectric　properties.　The　Space-charge　polarization　and　hoping　mechanism　contributed　to　low　AC　conductivity　at　lower　frequencies　and　high　AC　conductivity　at　higher　frequencies.　The　as-synthesized　NCs　effectively　degraded　two　toxic　water　contaminants,　such　as　crystal　violet　(CV)　and　Congo　red　(CR).　Furthermore,　the　NCs　were　also　evaluated　for　humidity　sensing　measurements.　All　of　the　NCs　indicated　efficient　response/recovery　time　with　better　stability.　The　extensive　investigation　suggested　the　synthesized　NCs,　well　suited　for　various　optical　and　microelectronic　applications.