Aspects regarding colour fastness and adsorption studies of a new azo-stilbene dye for acrylic resins

Abstract

The aim of this study was the colour fastness investigation of the new synthetized direct symmetrical azo-stilbene dye, using two of the film field domain reference tests, namely the wet-scrub and the UV tests. The dye was incorporated in a water-based resin, and then was applied on a PCV foil. The film colour parameters were determined before and after 200 wet-scrub cycles. Further, the dye was mixed with an acrylo-polyurethanic resin and then was applied on an aluminium plate, which was exposed to UV radiation for 414 h. The film colour parameters were recorded periodically. The maxima of the reflectance spectra depend on the UV time exposure. The quality of the film was analysed by the degree of gloss. A second focus was the elimination of the dye’s traces from wastewaters (these may be resulted from the industries which apply surface coating methods), using the active carbon powder. The main operational adsorption process parameters influence were investigated. Equilibrium, kinetic and thermodynamic studies were performed. The adsorption process was confirmed by the CIEL*a*b* colour space analysis. All colour studies were investigated using UV–Vis spectroscopy.

A Novel Approach of Bioesters Synthesis through Different Technologies by Highlighting the Lowest Energetic Consumption One

“…As expected, the film darkness increasing with the ester concentration. The same result were presented in scientific literature [ 18 , 60 , 61 ].…”

“…The film was then deposited on a cellulosic support (wood). Color properties reveal that the reflectance increased with the ester concentration ( Figure 7 ) according to other studies [ 59 , 60 ].…”

Mesoporous Fe–Al-doped cellulose for the efficient removal of reactive dyes

“…Biosorption studies using a natural polymer in its native or modified state are gaining more importance now-adays. A number of naturally occurring polymers that are abundantly available in nature and on proper treatment have been reported as effective adsorbents are cellulose [2][3][4] , chitin 5,6 and chitosan [7][8][9][10][11] , alginates 12,13 , clays 14 , magnetic ferrites 15,16 and resins 17,18 . They were applied for various water pollutants removal such as heavy metals 19,20 , dyes in single 21,22 and binary systems 23 , pesticides, paints etc.…”

Factors Affecting Synthetic Dye Adsorption; Desorption Studies: A Review of Results from the Last Five Years (2017–2021)

“…During the dye removal process, the capacity may decrease for two reasons [ 194 ]: adsorption sites remain unsaturated while the number of sites available for adsorption increases; or aggregation or agglomeration of adsorbent particles may occur, reducing the available surface area and increasing the diffusion path length. …”