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Vbto converter 2.51 full5/26/2023 The prepared samples were employed for the photocatalytic degradation of Congo red dye and the nano-heterostructure (ZnSe/Co 3O 4 3:1) shows an exceptional photocatalytic degradation efficiency of 96%. The UV/visible absorption spectrum of ZnSe depicts a sharp absorption at around 480 nm, while Co 3O 4 demonstrates two prominent peaks, 510 nm and 684 nm. The EDX results show that all the elements are present in accordance with their anticipated amounts in the products. The scanning electron micro-images of ZnSe show a mixed morphology of nanoparticles (≈16 nm), including spherical and distorted cubes, while Co 3O 4 has a worm-like morphology (≈20 × 50 nm). The X-ray diffraction results corroborate the good crystallinity and purity of all synthesized products, i.e., ZnSe, Co 3O 4 and their nanocomposites. In the present paper, simple hydrothermal and solid-state methods are reported for the synthesis of metal chalcogenide (ZnSe), metal oxide (Co 3O 4) and their nano-heterostructure (ZnSe/Co 3O 4 3:1, 1:1 and 1:3 ratios by weight), while their photocatalytic efficiencies are also investigated.
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