Degradation of p-nitrophenol (PNP) in aqueous media by tungsten oxide-based photocatalyst using visible light
Subject Areas :
فاطمه هدایتی نسب
1
(
کارشناس ارشد شیمی تجزیه، دانشکده شیمی و مهندسی شیمی، دانشگاه صنعتی مالک اشتر، تهران، ایران
)
علیرضا زارعی
2
(
دانشیار شیمی تجزیه، دانشکده شیمی و مهندسی شیمی، دانشگاه صنعتی مالک اشتر، تهران، ایران
)
هادی رضایی وحیدیان
3
(
دکتری شیمی کاربردی، پژوهشکده سامانههای حمل و نقل فضایی، پژوهشگاه فضایی ایران
)
Keywords: Visible Light, Hydrothermal synthesis, Para-Nitrophenol Degradation, Advanced Oxidation Process, Tungsten Oxide Photocatalyst,
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.