Azo dyes are compounds containing one or more azo groups of which the nitrogen atoms are SP3 hybridized. The azo groups form links or bridges between organic residues of which one is usually an aromatic nucleus. And being a chromophore, azo groups imparts colour to textile fibres. The depth of shade is influenced by the number of azo groups present in the structure of the azo dye. They have been found to be capable of forming hydrogen bonds with the fibre thereby enhancing dye-fibre binding forces (Francis, 2003). p-Aminophenol is an aromatic amino compound and a useful source of diazonium ions (salts) for azo coupling reactions. It has found wide applications in the synthesis of mono-azo dyes which are used commercially as dyes (David and Geoffery, 1994). Typical examples include C.I. Mordant Brown 54, Acid yellow 76, Acid Yellow 40, Sulphur green 10 and Disperse Yellow 1. However, very limited commercial dis-azo dyes derived from p-aminophenol have been reported in the literature. One example of such dye is C.I. Disperse yellow 68 where the coupling components were aniline and phenol (Ven Kataraman, 1978). Also, a series of dis-azo dyes which gave good dyeing properties on polyester and nylon substrates has been prepared from p-aminophenol (Otutu ., 2007).
The 4-amino-2-chloro-6,7-dimethoxyquinazolines are important synthons for the synthesis of several biologically active molecules. For instance, a large number of compounds possessing fused nitrogen-containing heterocyclic skeletons including 4-amino-quinazolines have been found to exhibit excellent anticancer activity (; ; ). Thus, from available literatures, there is no report of the use of 4-amino-2-chloro-6,7-dimethoxyquinazoline in the synthesis of azo disperse dye compounds.
Dye Synthesis 2/8 Treow x Avtechno
Method 2: Synthesis of 2-methoxy-5-nitrophenylazo-4-(N-phenylnaphthylamine): The 2-Methoxy-5-nitroaniline (4 g, 0.24 mole) was mixed with 40 mL water and 5 mL of concentrated sulph. (98%) was added and stirred. The mixture was cooled to 0-5°C.
Novel effective dye sorbents: synthesis and ..
Nanostuctured materials become more and more attractive in recent years, because these materials possess favorable and enhanced physical and chemical properties. Much effort has been made toward the preparation of MnO2 nanostructures with different morphologies [-]. However, very few reports on the synthesis of MnO2 nanostructures with Solution combustion. In this paper, we report a facile, energy saving method to synthesize MnO2 nano powders with highly porous structure via solution combustion route and its potential application in removal of organic dye from aqueous solution.
Synthesis and Absorption Spectra of Monoazo Dyes …
Direct green dye has a molecular formula of C34H22N8Na2O10S2 and its molecular weight of 767.7. Direct dyes colour cellulose fibres directly without the use of mordant. They are used for dyeing wool, silk, nylon, cotton, rayon etc. Direct dyes colour cellulose fibres directly without the use of mordant. It has a strong, though apparently non-covalent affinity to cellulose fibres. However, its tendency to change colour when touched by sweaty fingers and its toxicity has proven to be a disadvantage to its best use.
the result of a failed attempt at the total synthesis of quinine.
In this study, highly porous and crystalline nano MnO2 was synthesized by low temperature combustion synthesis. The adsorbent consists of monocrystalline particles of 15-20 nm size. The ability of MnO2 to adsorb DG was investigated by batch adsorption studies. The amount of dye adsorbed was found to vary with adsorbent dosage. The amount of dye uptake (mg/g) was found to increase with increase in adsorbent dose upto 0.4 g L-1 and beyond which it decreases. It can be concluded that the combustion derived nano porous MnO2 is an efficient adsorbent for the removal of DG from aqueous solution.