Spectroscopic studies of Direct Blue 1 in solution and on cellulose surfaces: effects of environment on a bis-azo dye

Operational parameters affecting the removal and recycling of direct blue industrial dye from wastewater using bleached oil mill waste as alternative adsorbent material

“…[26,27] These results were in excellent agreement with the considerations reported by Abbott et al [5] about the role of pH values on the pH-dependent equilibrium forms of DB78. [5] Consequently, in our condition, as well described by Sayğili et al [8] in their studies related to the chemical modification of a cellulose-based material to improve its adsorption capacity for anionic dyes, at the increasing of the dye solution pH, the adsorptions of the dye decreased due to the electrostatic repulsion between the negatively charged pomace surface and DB78 charges. [8] Moreover, in presence of OH − ions in excess, these efficiently competed with dye anions for the adsorption sites onto the sorbent surface.…”

“…[4] Accordingly, both the charges of the pomace and DB78 were reduced inducing specific dipole-dipole and hydrogen bonding interactions as well as non-specific induction and dispersion interactions; hydrophobic interactions may also be important. [5] Miyamoto et al [32] suggested that direct ionic dyes interrupt hydrophobic stacking between cellulose polymer forming hydrogen bonds. Moreover, the planes of glucose rings interacted with the dye aromatic moieties, and the sulfonate groups of the dye molecules interacted with the cellulose hydroxyl groups.…”

“…[4] Nonetheless, the release of azo dyes into environment is of great concern, due to both their highly visible color in water, and their toxicity, mutagenicity and carcinogenicity, it still continues to find new applications in high-technology areas. [5,6] Although the amount of discharged dyes in water is not exactly known, recently Pirkarami et al [7] reported that more than 5000 tons of dyeing materials are drained into the environment every year, affecting the human life and the global ecosystem. [7] Indeed, dyes are stable to light and heat, they have a high organic content, and the most part of them have complex aromatic structures not biodegradable.…”

Spectroscopic study of interactions between model direct dyes and cotton

“…They report NMR, resonance Raman, IR, and UV-visible spectroscopic studies of dyes in solution and in cellulose. For example, NMR spectra from solution samples provide information on tautomer forms, hydrogen bonding, and deuterium exchange, Abbott et al 15 The crystal structure of the native cellulose has been continuously investigated by solid-state NMR spectroscopic analysis. But, there have been few attempts to explain how dyes interact with cellulose.…”

“…NMR spectroscopy is typically used for separate analyses of dyes (Viscardi et al, 11 Wiench et al, 12 Voss, 13 Lyčka et al 14 ), dyes solutions, Abbott et al 15 or cotton, textiles or modified polymers based on cellulose mixtures, (Hirai et al, 16 Colletti and Mathias, 17 Princi et al, 18 Chanzy et al, 19 Larsson et al, 20 Dudly et al, 21 Lennholm et al, 22 Randloff et al, 7 Adebajo and Frost 10 ). Spectroscopic studies of the intermolecular interactions of azo dyes in solution and in cellulose were described (Abbott et al, 15 Abbott et al, 23 Batchelor and Oakes, 24 Abbott et al, [25][26][27] Yamaki et al 28 ).…”