Recently,　rising　distress　over　ecological　pollution　owing　to　water　contamination　by　coloring　effluents　primarily　due　to　dyes　is　of　growing　concern.　The　development　of　semiconductor/magnetic　oxide-based　nanomaterials　has　verified　to　be　a　potent　remediation　means　for　water　pollution.　In　the　present　article,　the　fabrication　of　nanocomposites　was　carried　out　by　the　facile　hydrothermal　method.　The　ZnO　and　ZnSe　nanoparticles　were　in　situ　formed　on　the　alpha-Fe2O3　layer,　thereby　forming　a　heterojunction.　The　prepared　alpha-Fe2O3/ZnSe　nanocomposite　possessed　a　degradation　of　98.9%　for　a　Congo　red　aqueous　solution　of　100　ppm.　The　alpha-Fe2O3/ZnO　nanocomposite　showed　only　26%　degradation　of　100　ppm　dye　solution　depicting　a　poor　photocatalytic　performance.　This　is　attributed　to　the　formation　of　recombination-enhanced　configuration　(type-I　heterostructure)　in　the　alpha-Fe2O3/ZnO　nanocomposite　(NC).　In　contrast,　alpha-Fe2O3/ZnSe　NC　accomplished　a　higher　and　enhanced　photocatalytic　response.　The　key　rationale　for　elevated　photocatalytic　response　is　the　establishment　of　a　recombination-free　configuration　(type-II　heterostructure).　Thus,　alpha-Fe2O3/ZnSe　NC　known　as　one　of　outstanding　nanoparticle-nanocomposite　photocatalysts　was　synthesized　under　mild　conditions　exclusive　of　some　multifaceted　post-treatment,　for　dye　abatement　process.