Azo compounds are compounds bearing the functional group R-N=N-R', in which R and R' can be either aryl or alkyl. IUPAC defines azo compounds as: "Derivatives of diazene (diimide), HN=NH, wherein both hydrogens are substituted by hydrocarbyl groups, e.g. PhN=NPh azobenzene or diphenyldiazene." The more stable derivatives contain two aryl groups. The N=N group is called an azo group. The name azo comes from azote, the French name for nitrogen that is derived from the Greek a (not) + zoe (to live).
Most colored textile and leather articles are treated with azo dyes and pigments.
As dyes and pigments
As a consequence of п-delocalization, aryl azo compounds have vivid colors, especially reds, oranges, and yellows. Therefore, they are used as dyes, and are commonly known as azo dyes, an example of which is Disperse Orange 1. Some azo compounds, e.g., methyl orange, are used as acid-base indicators due to the different colors of their acid and salt forms. Most DVD-R/+R and some CD-R discs use blue azo dye as the recording layer. The development of azo dyes was an important step in the development of the chemical industry.
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The use of mascara dates back to antiquity ...Carbon black is a deep non-reflective black colour ... There are also a whole host of organic dyes available, in particular Azo dyes, synthesised from aromatic amines that can create more than 2,000 colours ... Q ... Q.
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Researchers have developed a special nanostructure to filter a widespread class of harmful dyes from water ...Organic dyes represent the largest group of synthetic dyes, including so-called azo compounds ... "The dyes remain stored in the nanoweb.
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But throwaway fashion garments can also contain toxic chemicals including PFAS (synthetic chemicals used widely in consumer products from non-stick baking tins to clothes), azo dyes, phthalates and formaldehyde.
A new study led by Flinders University has discovered a novel way to degrade and potentially remove toxic organic chemicals including azo dyes from wastewater, using a chemical photocatalysis process powered by ultraviolet light.
Some additives have been banned, including potassium bromate (E924), used in flour and classed as possibly carcinogenic; colourants known as 'azo dyes' in some spice powders and also linked to cancer; ...
But throwaway fashion garments can also contain toxic chemicals including PFAS (synthetic chemicals used widely in consumer products from non-stick baking tins to clothes), azo dyes , phthalates and formaldehyde .
(MENAFN - P&SIntelligence) Dyestuffs refer to water-soluble inexpensive materials that are used to impart color to fabrics. These substances comprise of pigments, azo acids, dyes, and ... .
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Moreover, most of these substances prove to be toxic through interaction or degradation, as is the case with azo dyes that are ubiquitous and persistent in the environment ... My research-creation proposes a critical reflection on textile dyeing.
"It was found that this configuration greatly enhances Cu2O’s ability to catalyze the breakdown of azo dyes into harmless chemicals," UPD said in a statement ... Thus, these carcinogenic Azo dyes' regulated use and safe disposal remain a global concern.
Consumer products that contain the listed aromatic amines originating from restricted azo dyes are currently prohibited from being manufactured or sold in many countries including India...Table 1 Prohibited Substances under Azo Dyes S.No.
