Photocatalytic activity of PbMoO4 molybdate synthesized by microwave method

• Published in: Catalysis today 2013-09, Vol.212, p.70-74
• Main Authors: Hernández-Uresti, D.B., Martínez-de la Cruz, A., Aguilar-Garib, J.A.
• Format: Article
• Language: English
• Subjects: bleaching; carbon; Catalysis; catalytic activity; Chemistry; dyes; ethylene glycol; Exact sciences and technology; General and physical chemistry; half life; Heterogeneous photocatalysis; indigo carmine; irradiation; methyl orange; Microwave irradiation; mineralization; molybdates; PbMoO4; Photochemistry; photolysis; Physical chemistry of induced reactions (with radiations, particles and ultrasonics); powders; reflectance; scanning electron microscopy; spectroscopy; temperature; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; transmission electron microscopy; ultraviolet radiation; X-radiation
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2012.12.015

[Display omitted] ► PbMoO4 was synthesized by using microwave irradiation in ethylene glycol medium. ► Bleaching of the organic dye solutions over PbMoO4 was quickly reached. ► PbMoO4 photocatalyst was able to mineralize rhB, IC, OG and MO. 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 (t1/2) shorter than 7min. On the other hand, MO shows a recalcitrant behavior to photocatalytic degradation with t1/2=172min. 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 96h of UV irradiation.