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<p>Photocatalytic degradation of organic pollutants is a promising approach for addressing water pollution, driven by semiconductor materials that can harness solar energy. This study explores the synthesis of nanostructured WO<sub>3</sub>-modified ZnWO<sub>4</sub> composites with varying WO<sub>3</sub> concentrations (1%, 5%, 10%, 15%, and 20%). The degradation of methylene blue dye under natural sunlight is accomplished by photocatalytic activity. The degradation process of the dye is monitored spectrophotometrically. Characterization techniques, including X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), UV–Visible diffuse reflectance spectroscopy (UV-DRS), photoluminescence (PL), and X-ray photoelectron spectroscopy (XPS), confirmed the successful formation of nanocomposites and provided insights into the enhancement mechanisms. The 10% composite sample shows&#xa0;a significant band gap and smaller particle size than the other samples. By changing the parameters of contact time and catalyst concentration, degradation is examined. Among the various concentrations of WO<sub>3</sub>, 10% weight concentration of WO<sub>3</sub> with ZnWO<sub>4</sub> is found to be the optimal concentration and shows the highest degradation rate. The degradation rate is 72.58% for 10% WO<sub>3</sub>@ZnWO<sub>4</sub>, and for pristine ZnWO<sub>4</sub>, it is 42.95%. The results indicate a significant improvement in photocatalytic efficiency with the optimal composition of 10% WO<sub>3</sub>, attributed to effective band gap tuning and improved charge separation. This work establishes a new standard for the creation of zinc tungstate nanocomposites based on WO<sub>3</sub> and their application in wastewater treatment.</p>

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Efficient photocatalytic methylene blue dye removal using WO3@ZnWO4 nanostructures

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Kalpana S. Lamture,
  • Niteen S. Jawale,
  • Sudhir S. Arbuj,
  • Sunit B. Rane,
  • Latesh K. Nikam

摘要

Photocatalytic degradation of organic pollutants is a promising approach for addressing water pollution, driven by semiconductor materials that can harness solar energy. This study explores the synthesis of nanostructured WO3-modified ZnWO4 composites with varying WO3 concentrations (1%, 5%, 10%, 15%, and 20%). The degradation of methylene blue dye under natural sunlight is accomplished by photocatalytic activity. The degradation process of the dye is monitored spectrophotometrically. Characterization techniques, including X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), UV–Visible diffuse reflectance spectroscopy (UV-DRS), photoluminescence (PL), and X-ray photoelectron spectroscopy (XPS), confirmed the successful formation of nanocomposites and provided insights into the enhancement mechanisms. The 10% composite sample shows a significant band gap and smaller particle size than the other samples. By changing the parameters of contact time and catalyst concentration, degradation is examined. Among the various concentrations of WO3, 10% weight concentration of WO3 with ZnWO4 is found to be the optimal concentration and shows the highest degradation rate. The degradation rate is 72.58% for 10% WO3@ZnWO4, and for pristine ZnWO4, it is 42.95%. The results indicate a significant improvement in photocatalytic efficiency with the optimal composition of 10% WO3, attributed to effective band gap tuning and improved charge separation. This work establishes a new standard for the creation of zinc tungstate nanocomposites based on WO3 and their application in wastewater treatment.