Etude structurale des oxysulfures de chrome(III) et de terres rares. I. Structure de l'oxysulfure LaCrOS2

1980 ◽  
Vol 36 (6) ◽  
pp. 1291-1294 ◽  
Author(s):  
J. Dugué ◽  
T. Voyan ◽  
J. Villers
Keyword(s):  
2010 ◽  
Vol 973 (1-3) ◽  
pp. 1-8 ◽  
Author(s):  
Hossein Eshtiagh-Hosseini ◽  
Zakieh Yousefi ◽  
Masoud Mirzaei ◽  
Ya-Guang Chen ◽  
S. Ali Beyramabadi ◽  
...  

2021 ◽  
Vol 55 (6) ◽  
Author(s):  
Trung Kien Pham ◽  
Tran Ngo Quan

In this paper, we report on synthesizing xonotlite, calcium silicate hydrate (CSH), via a hydrothermal reaction using rice husk from the Mekong Delta, Vietnam. The rice husks were burnt at 1000 °C for 3 h. Grey rice husk ash was collected, then mixed with Ca(OH)2 at a Ca/Si molar ratio of 1 : 1. This was followed by a hydrothermal reaction at 180 °C for 24 h and 48 h to obtain the xonotlite mineral. Before and after adsorption, 3-mm xonotlite pellets were thoroughly characterized using X-ray diffractometry (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM) and ultraviolet-visible (UV-VIS) spectroscopy. This material has potential application in chromium(III) removal during a chrome-plating process. The adsorption efficiency of the 3-mm pellet samples reached more than 76 % after 12 h.


1984 ◽  
Vol 40 (7) ◽  
pp. 1181-1183 ◽  
Author(s):  
F. Abraham ◽  
G. Nowogrocki ◽  
J. Brocard ◽  
J. Lebibi ◽  
C. Brémard
Keyword(s):  

2009 ◽  
Vol 63 (5) ◽  
Author(s):  
Matilda Zemanová

AbstractCorrosion resistance of zinc coatings was investigated in an accelerated corrosion test in a condensation chamber. Zinc was electrodeposited from alkaline and acidic electrolytes using direct current (DC) or pulse current (PC). The zinc coating was subsequently protected against corrosion with a chrome (III) layer. Morphology and structure of the coatings was investigated using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and X-ray diffraction analysis (XRD) before and after the corrosion test. Corrosion resistance of alkaline zinc coatings electrodeposited with DC and PC under test conditions was found to be comparable. The corrosion resistance of zinc coatings deposited from acidic electrolytes by PC was lower in comparison with corrosion resistance of zinc coatings deposited using DC.


Author(s):  
Yun-Qiao Ding ◽  
Cheng-Lung Chen ◽  
Qi-Rui Gu ◽  
Jun-Min Liao ◽  
Po-Hsiang Chuang

1976 ◽  
Vol 38 (4) ◽  
pp. 886-887 ◽  
Author(s):  
J. Casabó ◽  
J. Ribas ◽  
J.M. Coronas
Keyword(s):  

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