caa a22 4500 606181407 CHVBK 20210128100810.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s10876-014-0735-z doi (NATIONALLICENCE)springer-10.1007/s10876-014-0735-z Novel Synthesis of Cobalt Nickel Tungstate Nanopowders and its Photocatalytic Application [Elektronische Daten] [Said El-Sheikh, Mohamed Rashad] Nanocrystalline cobalt nickel tungstate powders (CO1−XNiXWO4 where X=0, 0.5 and 1) have been synthesized by a microemulsion method. The results indicate that pure monoclinic wolframite tungstate structure was obtained from the precipitated precursors at pH 10 calcined at a temperature 600°C for 6 and 10h. Meanwhile, the average particle sizes of the formed tungstate powders were about 12-35nm. The specific surface areas of the produced materials were about 33.8-42.8cm3/g and the average pore diameters were 4.5-6.3nm. The NiWO4 material indicated band gap energy E gvalue of 3.2eV whereas that of CoWO4revealed a value of 2.7eV. TEM images investigated that the formed particles were nearly nanoclusters. Furthermore, HRTEM results revealed that NiWO4 powders have (0 1 0) and (1 0 0) planes which led to the highest photocatalytic activity. Photocatalytic decomposition of methylene blue (MB) as a model pollutant was used to evaluate the photocatalytic activity of CO1-XNiXWO4 catalysts under UV irradiations. The MB degradation rate with the irradiation time using NiWO4, CoWO4 and Co0.5Ni0.5WO4 catalysts was estimated apparent first kinetic rate constants of 0.013, 0.012 and 0.010min−1, respectively. Springer Science+Business Media New York, 2014 Nanostructures nationallicence Chemical synthesis nationallicence TEM nationallicence Surface properties nationallicence Photocatalysis nationallicence El-Sheikh Said Advanced Materials Technology Department, Central Metallurgical Research & Development Institute (CMRDI), P.O. Box: 87, Helwan, 11421, Cairo, Egypt aut Rashad Mohamed Advanced Materials Technology Department, Central Metallurgical Research & Development Institute (CMRDI), P.O. Box: 87, Helwan, 11421, Cairo, Egypt aut Journal of Cluster Science Springer US; http://www.springer-ny.com 26/3(2015-05-01), 743-757 1040-7278 26:3<743 2015 26 10876 https://doi.org/10.1007/s10876-014-0735-z text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10876-014-0735-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- El-Sheikh Said Advanced Materials Technology Department, Central Metallurgical Research & Development Institute (CMRDI), P.O. Box: 87, Helwan, 11421, Cairo, Egypt aut NATIONALLICENCE 700 1- Rashad Mohamed Advanced Materials Technology Department, Central Metallurgical Research & Development Institute (CMRDI), P.O. Box: 87, Helwan, 11421, Cairo, Egypt aut NATIONALLICENCE 773 0- Journal of Cluster Science Springer US; http://www.springer-ny.com 26/3(2015-05-01), 743-757 1040-7278 26:3<743 2015 26 10876