Abstract
The influence of iron ions at concentrations of 0.2, 0.5, and 1.0 g/L on optical brighteners of the groups stilbene and biphenyl in solution and on cotton fabric was investigated. Both groups of optical brighteners are intended for detergent formulations. The influence of iron ions was studied by absorption and fluorescence spectra in solution and by whiteness degree, identifying color differences using CIEL*a*b* coordinates and Ultraviolet Protection Factor (UPF) of cotton fabrics. The obtained results in solutions and cotton fabrics showed different behavior of optical brighteners stilbene and biphenyl in the presence of iron. Stilbene compounds with metal ions produced new species capable of absorbing in the UV-B region of the spectrum. A biphenyl compound in combination with iron had no effect on the absorption properties. Both optical brighteners were influenced by iron ions in the sense of fluorescence quenching. The influence of iron ions in single- and two-bath treatments of cotton fabrics after one cycle on whiteness degree and UPF was negligible.
Highlights
Optical brighteners (OBs) are special compounds that contain a fluorescent system instead of a chromophore and are intended for optical and UV protection applications [1].The basic requirement for these compounds is the ability to absorb electromagnetic radiation (EMR) in the UV spectrum
The application of OBs with iron ions on cotton fabrics was analyzed by whiteness degree, CIEL*a*b* coordinates, and Ultraviolet Protection Factor (UPF) (Figures 5–9, Table 6)
Absorption and Fluorescence Curves of Optical Brighteners in a Solution In Figure 1a,b, the absorbance and fluorescence spectra of stilbene OB are plotted for three different concentration ranges
Summary
The basic requirement for these compounds is the ability to absorb electromagnetic radiation (EMR) in the UV spectrum. It is usually associated with the molecules with planar configuration (e.g., metal complexes), conjugated double bonds, or high resonance stability, outstanding among them are aromatic compounds with an electron donor group UV protection of cotton textiles can be improved by fabric weaving construction parameters and finishes [6,7,8,9,10,11,12,13,14]. OBs are known finishing additives that can improve the UV protection of cotton textiles [15,16,17]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
