Dyes and Indicators, Use of UV-Visible Absorption Spectroscopy

Hydroxypropyl Guar/Cellulose Nanocrystal Film with Ionic Liquid and Anthocyanin for Real-Time and Visual Detection of NH3

“…The effect of pH on the visible light spectra of the films might be attributed to two reasons: (1) BmimCl is a strong polar solvent comprising an aromatic ring p−π conjugated structure. It could cause the π–π* transition of the valence electron, decrease the electron cloud density, reduce the energy required for excitation light, and increase the degree of conjugation and polarity of the system, resulting in a red shift of the wavelength; − (2) the Anth molecule is a chromophore (aromatic system), and Cl – is an auxochrome. When the chromophore is linked to auxochrome, the absorption band of the chromophore is red shifted…”

Spectrometric study of crystal violet in presence of polyacrylic acid and polyethylenimine and its removal by polyelectrolyte enhanced ultrafiltration

“…Studies on binding of cationic dye to different synthetic and natural polymer by absorbance, fluorescence and circular dichroism experiments during the last few decades yielded significant contributions [18][19][20][21][22][23][24]. In those results the importance of both electrostatic and hydrophobic interactions is strongly emphasized.…”

Removal of dyes from wastewater using polyelectrolyte enhanced ultrafiltration (PEUF)

“…Studies on binding of cationic dye to different synthetic and natural polymer by absorbance, fluorescence and circular dichroism experiments during the last few decades yielded significant contributions [20][21][22][23][24][25]. In those results the importance of both electrostatic and hydrophobic interactions is strongly emphasized.…”