Z-SCHEME PHOTOCATALYTIC DEGRADATION OF REACTIVE ORANGE 16 (RO16) DYE OVER TUNGSTEN TRIOXIDE AND CADMIUM SULFIDE (WO3-CdS) COMPOSITE UNDER VISIBLE LIGHT IRRADIATION
DOI:
https://doi.org/10.11113/aej.v14.21334Keywords:
Photocatalysis, Energy storage, WO3, CdS, Visible light drivenAbstract
The escalating global concern over dye wastewater pollution, characterized by its harmful effects, has sparked interest in visible light-activated photocatalysis for cost-effective industrial wastewater treatment. The study focused on visible light-activated photocatalysts, notably cadmium sulfide (CdS) with a 2.4 eV band gap energy and tungsten trioxide (WO3) known for its resilience to photo degradation, durability across various pH conditions, and a 2.7 eV band gap energy. However, CdS is susceptible to photo anodic corrosion, while WO3 exhibits low photocatalytic degradation performance due to rapid recombination between excited electrons and electron holes from low-energy visible light. The Z-scheme electrons transfer photocatalyst (WO3-CdS) was designed to extend recombination time and maintain WO3 stability. This visible light-activated composite was synthesized through a simple and cost-effective precipitation method. CdS were kept constant while mass of WO3 were varied for 3 g, 5 g, 10 g. Structural and morphological analyses were conducted using various techniques, including field emission scanning electron microscopy (FE-SEM), energy dispersion of X-ray (EDX), Fourier transform infrared (FTIR), X-ray diffraction (XRD), and UV-Vis-NIR spectrophotometer to analyze various properties. The synthesized composite of WO3-CdS successfully lowered the band gap energy to 2.28 eV and shifted the photon absorption more towards the visible spectrum. When applied to the photo degradation of reactive orange 16 (RO16) under visible light for 300 minutes, the WO3-CdS composite exhibited a remarkable 64.45 % degradation rate, surpassing pure CdS and WO3 rates of only around 1.18 % each. The Z-scheme electron transfer process between CdS and WO3 significantly enhanced catalytic efficiency. This achievement holds promise for sustainable wastewater remediation, marking a notable advancement in the field.
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