Fabrication of Novel CuWO4/SnO2  heterogeneous Photocatalyst for Efficient Degradation of Rose Bengal Dye under Visible Light Irradiation

Kamaraj, Eswaran; Balasubramani, Kavitha

doi:10.22068/ijmse.2641

Volume 21, Issue 2 (June 2024) IJMSE 2024, 21(2): 1-13 | Back to browse issues page

‎ 10.22068/ijmse.2641

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Kamaraj E, Balasubramani K. Fabrication of Novel CuWO4/SnO2 heterogeneous Photocatalyst for Efficient Degradation of Rose Bengal Dye under Visible Light Irradiation. IJMSE 2024; 21 (2) :1-13
URL: http://ijmse.iust.ac.ir/article-1-2641-en.html

Fabrication of Novel CuWO4/SnO2 heterogeneous Photocatalyst for Efficient Degradation of Rose Bengal Dye under Visible Light Irradiation

Eswaran Kamaraj

, Kavitha Balasubramani

Abstract: (6650 Views)

Heterostructure photocatalyst of CuWO₄ modified SnO₂ (CuWO₄/SnO₂) was fabricated by in simple wet-impregnation process and evaluated via degradation of rose Bengal (RB) under visible light irradiation. The samples had been completely characterized by Ultraviolet-visible diffuse reflectance spectroscopy (UV-vis-DRS), X-ray diffraction (XRD), Scanning electron microscopy (SEM) combined with energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), High-resolution TEM (HR-TEM), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett and Teller surface analysis (BET). The result divulged that amongst the catalysts, CuWO₄/SnO₂ displayed higher photocatalytic activity than CuWO₄ or SnO₂. The enhanced photocatalytic efficiencies are attributed to the charge transfer from SnO₂ to CuWO₄ nanoparticles, which efficiently decrease electron-hole recombination energy level. The time required for maximum degradation of rosebengal (RB) under visible light over CuWO₄/SnO₂ was 180 min. The other parameters such as pH (pH=8), photocatalyst dosage (0.2 g/L) and dye concentration (20 µM) were optimized to achieve high degradation efficiency (98.5%). The excellent photocatalytic activity of CuWO₄/SnO₂ is due to efficient separation of photogenerated electron-hole pairs. The holes (h⁺) and superoxide radicals (O₂^•-) are the reactive species involved in photocatalytic mechanism for gdegradation of RB.

Keywords: Surface modification, CuWO4/SnO2, photodegradation, Rose bengal.