tungsten oxide
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2022 ◽  
Vol 374 ◽  
pp. 131774
Author(s):  
Xin Wang ◽  
Longwen Li ◽  
Hong Jiang ◽  
Hui Zhangsun ◽  
Qinzhi Wang ◽  
...  

2022 ◽  
Vol 141 ◽  
pp. 106431
Author(s):  
Maziyar Kazemi ◽  
Mohammad Zirak ◽  
Nafiseh Arab ◽  
Hassan Alehdaghi ◽  
Javad Baedi

2022 ◽  
Vol 580 ◽  
pp. 121409
Author(s):  
Abuzar Khan ◽  
Nouf Al-Muhaish ◽  
A.K. Mohamedkhair ◽  
Mohd Yusuf Khan ◽  
Mohammad Qamar ◽  
...  

Author(s):  
Mehr-Un Nisa ◽  
Nimra Nadeem ◽  
Muhammad Yaseen ◽  
Javed Iqbal ◽  
Muhammad Zahid ◽  
...  
Keyword(s):  

2022 ◽  
Author(s):  
N. Derbasova

Abstract. The results of photocatalytic activity of tungsten oxide in visible light are analyzed. It was shown that tungsten oxide has photocatalytic activity under the action of visible light in the photodegradation of the dye methylene blue. It was determined that the concentration of 15 mg/L provides the highest rate of photodecomposition of methylene blue. The optimum temperature for the process was determined. The process of methylene blue decomposition is most effective at 25 °С.


2022 ◽  
Vol 60 (1) ◽  
pp. 53-61
Author(s):  
Hanjung Kwon ◽  
Jung-Min Shin

In this paper, we suggest a novel recycling process for hard metal sludge that does not use ammonium paratungstate. Ammonia, which in the conventional recycling process is essential for removing sodium and crystallized tungstate, was not used in the novel process. Instead of ammonia, acid was used to remove the sodium and crystallized tungstate resulting in the formation of tungstic acid (H2WO4). Tungsten powders were successfully synthesized by hydrogen reduction of the tungstic acid through H2O decomposition, WO3 to WO2 reduction, and tungsten metal formation. The tungsten powders prepared from tungstic acid were spherical in shape and had a higher sintering density than the facet-shaped tungsten powders prepared from tungsten oxide. The spherical shape of the tungsten powders enhanced their sinterability and resulted in an increase in the size of grains. This is a result of the high diffusion rate of the atoms along the particle surfaces. Despite having a higher density, the hardness of the sintered tungsten was lower than that of tungsten from tungsten oxide. High energy milling effectively reduced grain size and improved hardness. The hardness of the tungsten prepared from milled tungstic acid was enhanced to a value (max. 471 HV) higher than the best previously reported value (389 HV). In sum, tungsten can be hardened, thereby improving its sinterability and reducing grain size, with tungstic acid prepared using the proposed recycling process.


2022 ◽  
pp. 134700
Author(s):  
Mahesh M. Shanbhag ◽  
Nagaraj P. Shetti ◽  
Shankara S. Kalanur ◽  
Bruno G. Pollet ◽  
Mallikarjuna N. Nadagouda ◽  
...  

2022 ◽  
pp. 152424
Author(s):  
A. Chithambararaj ◽  
N. Pardhasaradhi ◽  
M. Kaleesh Kumar ◽  
A.S. Prakash ◽  
Subhendu K. Panda

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