Open AccessCatalytic purification of aqueous solutions of synthetic dyes using modified forms of bentonite
Author(s) -
Э. Ц. Дашинамжилова
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/687/6/066066
Subject(s) - catalysis , bentonite , chemistry , adsorption , leaching (pedology) , aqueous solution , nuclear chemistry , nitrogen , saponite , inorganic chemistry , montmorillonite , chemical engineering , organic chemistry , environmental science , engineering , soil water , soil science
Fe - and mixed Fe / Al - Bentonites (Bent) were prepared from naturally occurring montmorillonite and Fe and mixed Fe / Al containing polyoxocations. The samples were characterized by chemical analysis and low temperature adsorption of nitrogen. The Fe content was 15.5-36.0 mg · g −1 . Surface area S BET was equal 118-219 m 2 · g −1 . The catalytic wet peroxide oxidation of diazo dye Direct Blue using the obtained solids was studied. It was established that Fe / Al -Bent was the most active and stable in color and COD removals of Direct Blue. The important factors affecting catalyst activity and color removal have been studied i.e. the influence of pH, temperature, catalyst amount, H 2 O 2 concentration. The best results for color and COD removals and low Fe leaching were obtained when operated at pH = 4.6, t = 40°C, 1.0 g · 1 −1 catalyst and molar ratio [H 2 O 2 ]/[dye] = 70.