Photocatalytic activity of PbMoO₄ molybdate synthesized by microwave method

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• 作者：D.B. Hern¨¢ndez-Uresti ; A. Mart¨ªnez-de la Cruz ; J.A. Aguilar-Garib
• 关键词：PbMoO4 ; Microwave irradiation ; Heterogeneous photocatalysis
• 刊名：Catalysis Today
• 出版年：2013
• 出版时间：1 September, 2013
• 年：2013
• 卷：212
• 期：Complete
• 页码：70-74
• 全文大小：1828 K

文摘

Lead molybdate powders (PbMoO₄) with scheelite-type structure were successfully synthesized at low temperatures by using microwave irradiation (MW) in ethylene glycol medium. The resulting powders were characterized by X-ray powder diffraction (XRD), diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and adsorption-desorption N₂ isotherms (BET). PbMoO₄ was tested as photocatalyst under UV irradiation for the degradation reaction of rhodamine B (rhB), indigo carmine (IC), orange G (OG), and methyl orange (MO). The bleaching of the organic dye solutions over PbMoO₄ photocatalyst was quickly reached for rhB, IC, and OG with half-life times (t_1/2) shorter than 7 min. On the other hand, MO shows a recalcitrant behavior to photocatalytic degradation with t_1/2 = 172 min. Total organic carbon (TOC) analysis of samples irradiated revealed that mineralization of organic dyes by the action of PbMoO₄ is feasible in 67 % (rhB), 83 % (IC), 55 % (OG), and 60 % (MO) after 96 h of UV irradiation.