Spectrophotometric Determination of Acidity Constants of 4‐(2‐Pyridylazo) Resorcinol in Various Micellar Media Solutions

Abstract

Dissociation equilibria of 4-(2-pyridylazo) resorcinol (PAR) in aqueous micellar solutions were determined spectrophotometrically at 25°C and at the constant ionic strength I = 0.1 M KNO 3 . For this purpose, the effect of nonionic (Brij-35, Triton X-100, Triton X-114, Triton X-405), and anionic (SDS) surfactants on the absorption spectra of PAR at different pH values was studied. Results show that the pK a values and pure spectra of each species of PAR are influenced by percentages of a neutral and an anionic surfactant such as Brij-35, Triton X-100, Triton X-114, Triton X-405 and SDS, respectively, added to the solution of this reagent. Ghasemi et al. Fig. 3. The pure spectra of different forms of PAR in (a) pure water, (b) 0.05% (w/v) Brij-35 to water, (c) 0.05% (w/v) Triton X-100 to water, (d) 0.05% (w/v) Triton X-114 to water, (e) 0.05% (w/v) Triton X-405 to water and (f) 0.05% (w/v) SDS to water.

Evaluation of contaminants removal by a nanofiltration membrane modified with polymer-ion nanoparticles

“…Membrane processes are physical methods for separating solvents from soluble salts using permeable or semi-permeable membranes. Although the separation method with membranes is newer than other methods such as distillation, adsorption, crystallization, and liquid-liquid extraction but due to its efficiency and ease of use, their significant expansion has been observed [4][5][6][7][8].…”

Functionalization and Modification of Polyethylene Terephthalate Polymer by AgCl Nanoparticles under Ultrasound Irradiation as Bactericidal

“…Desirable optical, magnetic, catalytic, and antibacterial properties of AgCl make it a good candidate in different areas such as the photography, pharmaceutical, and electronic industry. 22 , 23 Various techniques have been developed for preparing AgCl nanoparticles such as electrospinning, 24 template synthesis, 25 microemulsion, 4 , 26 − 28 reverse micelles, 29 laser-based synthesis, 30 host–guest nanocomposite material, 31 , 32 ultrasonic spray pyrolysis, 33 and sonochemistry. 34 …”

“…Controlled design and synthesis of nanoparticles in different size and morphology are very important in both scientific and technological fields. − In this context, nano-crystalline silver halide coatings on some substrates with large surface areas have received major interest in recent years. Desirable optical, magnetic, catalytic, and antibacterial properties of AgCl make it a good candidate in different areas such as the photography, pharmaceutical, and electronic industry. , Various techniques have been developed for preparing AgCl nanoparticles such as electrospinning, template synthesis, microemulsion, ,− reverse micelles, laser-based synthesis, host–guest nanocomposite material, , ultrasonic spray pyrolysis, and sonochemistry …”