scholarly journals Kinetic Studies of Fast Equilibrium by Means of High-performance Liquid Chromatography. V. Stepwise Complex Formation of the Nickel(II) Ion with 2,2′-Bipyridine and 1,10-Phenanthroline

1984 ◽  
Vol 57 (7) ◽  
pp. 1823-1827 ◽  
Author(s):  
Masataka Moriyasu ◽  
Yohei Hashimoto
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Complex Formation ◽  
High Performance ◽  
Kinetic Studies

scholarly journals Photocatalytic Decolourization of Direct Yellow 9 on Titanium and Zinc Oxides

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Elżbieta Regulska ◽  
Diana Małgorzata Bruś ◽  
Joanna Karpińska
Keyword(s):  
Zinc Oxide ◽  
Titanium Dioxide ◽  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Azo Dyes ◽  
Spectrophotometric Method ◽  
High Performance ◽  
Kinetic Studies ◽  
Zinc Oxides ◽  
Photocatalytic Removal

The photodecolourization of Direct Yellow 9, a member of the group of azo dyes which are commonly used in the various branches of the industry, was investigated. The photostability of this dye was not previously examined. Photocatalytic degradation method was evaluated. Solar simulated light (E=500 W/m2), titanium dioxide, and zinc oxide were used as irradiation source and photocatalysts, respectively. Kinetic studies were performed on a basis of a spectrophotometric method. Degradation efficiency was assessed by applying high performance liquid chromatography. Disappearance of a dye from titanium dioxide and zinc oxide surfaces after degradation was confirmed by thermogravimetry and Raman microscopy. Direct Yellow 9 was found to undergo the photodegradation with approximately two times higher efficiency when zinc oxide was applied in comparison with titanium dioxide. A simple and promising way to apply the photocatalytic removal of Direct Yellow 9 in titanium dioxide and zinc oxide suspensions was presented.

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