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Textile dyes, photodegradation

Photocatalytic removal of Acid Red 14 (AR14), commonly used as a textile dye, using HO2 suspensions irradiated by a 30W UVC lamp has been studied [46, 376]. It was found that Ti02 and UV light had a negligible effect when they were used on their own. The mechanism of photocatalysis is described in Figure 5. In this study, the effects of some parameters such as pH, the amount of HO2 and initial dye concentration have also been examined. The photodegradation of Acid Red 14 was... [Pg.79]

Of particular relevance is the study of dye photodegradation, either on wet or dry cellulose, due to the importance of this effect in the textile industry [89]. Today we know that an increase of the humidity content in the fiber promotes a decrease in the lightfasmess of many dyes. This effect exists both for cotton and other polymers where the dye may be adsorbed or covalently bound [89-91]. It also occurs for wool, although to a smaller extent, since in this substrate the mechanism is essentially reductive, while in cellulose it is an oxidative one [89]. [Pg.299]

Deterioration. The causes of degradation phenomena in textiles (155—158, 164) are many and include pollution, bleaches, acids, alkaUes, and, of course, wear. The single most important effect, however, is that of photodegradation. Both ceUulosic and proteinaceous fibers are highly photosensitive. The natural sensitivity of the fibers are enhanced by impurities, remainders of finishing processes, and mordants for dyes. Depolymerization and oxidation lead to decreased fiber strength and to embrittlement. [Pg.428]

The photochemical properties of the group of compounds loosely described as dyes continues because of the interests in laser technology as well as textiles, photography, etc. The light stability and photodegradation of dyes has been the subject of a recent review. ... [Pg.66]

Biomedical and cosmetic industry food packaging water, wastewater, and air treatment textile and clothing household applications pesticides Optoelectronics, bio-labeling, lasing, photovoltaics Environmentally friendly active photocatalysts for photodegradation of various organic contaminants of dye wastewater, dielectric layers for electronic applications... [Pg.71]


See other pages where Textile dyes, photodegradation is mentioned: [Pg.372]    [Pg.428]    [Pg.372]    [Pg.378]    [Pg.76]    [Pg.77]    [Pg.155]   
See also in sourсe #XX -- [ Pg.323 ]




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Textile dyes

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