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Obregó,n, Sergio,Lee, Soo W.,Coló,n, Gerardo The Royal Society of Chemistry 2014 Dalton Transactions Vol.43 No.1
<P>Er-doped BiVO<SUB>4</SUB> are synthesized by means of a surfactant free microwave assisted hydrothermal method having good photoactivities under sun-like excitation for the degradation of methylene blue. From the structural and morphological characterization, it has been stated that the presence of Er<SUP>3+</SUP> induces a slight stabilization of the tetragonal phase, probably due to its incorporation in the BiVO<SUB>4</SUB> lattice. The best photocatalytic performances were attained for the samples with Er<SUP>3+</SUP> content higher than 3 at%. The occurrence of the Er<SUP>3+</SUP> doped tetragonal BiVO<SUB>4</SUB> clearly induces higher photocatalytic activities. The existence of a luminescence process has been related with the enhanced photoactivity observed.</P> <P>Graphic Abstract</P><P>Er<SUP>3+</SUP> doped t-BiVO<SUB>4</SUB> photocatalysts have been prepared by a microwave assisted hydrothermal method having improved solar-like photocatalytic activity. A cooperative mechanism is proposed in which the photocatalyst would efficiently exploit the wide range of the visible irradiation. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3dt51923f'> </P>
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A. Martínez-de la Cruz,S. Obregón Alfaro,Leticia M. Torres-Martínez,I. Juárez Ramírez 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.5
Bismuth tungstate Bi2W2O9 has been synthesized using diethylenetriaminepentaacetic acid (H5DTPA), an organic chelating agent of metals in an aqueous solution. The formation of the oxide was followed through characterization techniques such as XRD, TGA/DTA, and SEM. The optimum temperature to decompose the organic matrix and to form Bi2W2O9 was determined to be around 720 oC. Below this temperature, Bi2W2O9 was formed with a high content of Bi2WO6. At 720 oC particles of the Bi2W2O9 with a surface area four times higher than that obtained by a solid-state reaction were obtained. The oxide was tested as a photocatalyst on the degradation of aqueous solutions of rhodamine B under VIS radiation. The photodegradation of the dye followed a kinetic first order with an apparent constant, k = 2.8 × 10−3 minute−1and t1/2= 247 minutes for an aqueous solution of 5 mg l−1 of rhodamine B. Bismuth tungstate Bi2W2O9 has been synthesized using diethylenetriaminepentaacetic acid (H5DTPA), an organic chelating agent of metals in an aqueous solution. The formation of the oxide was followed through characterization techniques such as XRD, TGA/DTA, and SEM. The optimum temperature to decompose the organic matrix and to form Bi2W2O9 was determined to be around 720 oC. Below this temperature, Bi2W2O9 was formed with a high content of Bi2WO6. At 720 oC particles of the Bi2W2O9 with a surface area four times higher than that obtained by a solid-state reaction were obtained. The oxide was tested as a photocatalyst on the degradation of aqueous solutions of rhodamine B under VIS radiation. The photodegradation of the dye followed a kinetic first order with an apparent constant, k = 2.8 × 10−3 minute−1and t1/2= 247 minutes for an aqueous solution of 5 mg l−1 of rhodamine B.
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