Abstract :
Para-Nitrophenol (PNP) as a nitroaromatic matter is a hazardous pollutant in industrial wastewaters. In this paper degradation of the pollutant was performed by the catalysts of CuWO4/CuO, Na0.01WO3, and WO3 under visible light. The catalysts were synthesized by hydrothermal method and the process was performed in a suspension reactor equipped with a metal halid lamp (400 W). The synthesized catalysts were characterized using X-ray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM), and Diffuse reflection spectroscopy (DRS). The effective parameters of pH, reaction temperature, and light intensity have been studied. The results showed that using [Catalyst] = 2000 ppm, [PNP] = 20 ppm, T = 25 °C, and pH = 12 after 240 min, the degradation efficiency for WO3, Na0.01WO3, and CuWO4/CuO obtained about 40%, 42.3%, and 30%, respectively.
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