Dye wastes represent one of the most problematic groups of pollutants because they can be easily identified by the human eye and are not easily biodegradable. This literature review paper highlights and provides an overview of dye waste treatments performed over the three years period from 2008-2010. Noteworthy processes for the treatment of dye waste include biological treatment, catalytic oxidation, filtration, sorption process and combination treatments.
A new series of Schiff base esters, 4-(dimethylamino)benzylidene-4 0 -alkanoyloxyanilines containing even number of carbons at the end group of the molecules (C nÀ1 H 2nÀ1 COO, n = 6,8,10,12,14,16, 18) were synthesized. The present compounds were monotropic liquid crystals. It was also found that the end groups of the molecules had effect on the mesomorphic properties.
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