Thermodynamic and Spectroscopic Investigation of Interactions between Reactive Red 223 and Reactive Orange 122 Anionic Dyes and Cetyltrimethyl Ammonium Bromide (CTAB) Cationic Surfactant in Aqueous Solution

Abstract

The present study describes the conductometric and spectroscopic study of the interaction of reactive anionic dyes, namely, reactive red 223 and reactive orange 122 with the cationic surfactant cetyltrimethyl ammonium bromide (CTAB). In a systematic investigation, the electrical conductivity data was used to calculate various thermodynamic parameters such as free energy (ΔG), enthalpy (ΔH), and the entropy (ΔS) of solubilization. The trend of change in these thermodynamic quantities indicates toward the entropy driven solubilization process. Moreover, the results from spectroscopic data reveal high degree of solubilization, with strong interactions observed in the cases of both dyes and the CTAB. The spontaneous nature of solubilization and binding was evident from the observed negative values of free energies (ΔG p and ΔG b).

Solubilization of Ni Imidazole Complex in Micellar Media of Anionic Surfactants, Sodium Dodecyl Sulfate and Sodium Stearate

“…Both of the effects discussed above results in the drop of the entropy of the system. Hydrophobic group removal from the aqueous medium is favored by entropy changes because it leads to the breaking of highly organized aqueous structure and inhibits movement restrictions on hydrophobic chains [15,19,[26][27][28]. Figure 4 shows the simple UV-Vis absorbance spectrum of nickel imidazole complex with and without added surfactant.…”

“…For the NIC/SDS system, the values of K x and K b were estimated to be 9.66 9 10 4 and 233, respectively. The negative values of DG p and DG b (-28.44 and -13.51 kJ mol -1 , respectively) for this system reveal the spontaneity of partitioning, binding, and stability of the system [14,[17][18][19][20][21][26][27][28]. Similarly for the NIC/SS system, the values of K x are K b are 6.6 9 10 4 and 143, respectively, and DG p and DG b are -27.50 and -12.29 kJ mol -1 , respectively.…”

Bioleaching of sulfide containing material from the Wiśniówka Quarry: stability and adhesion of secondary products

“…Therefore, due to hydrophobic interactions between the surfactant tails, the formation of a surfactant bilayer could occur. The reported CMC of CTAB is 0.9-1.0 mM (Irfan et al, 2014;Li et al, 2006); thus, for the highest concentration, the excess surfactant might also be used to form micelles (Khademi et al, 2017).…”

Study of volumetric, viscometric, and aggregation properties of losartan potassium and its interaction with amino acids and cetyltrimethylammonium bromide in aqueous solution

“…The spontaneity of micellization process is found with the help of Equation by calculating the standard free energy change of micellization. [ 21 ] Here, α is counter ion binding which is calculated from degree of ionization of drug ( β ) as α = 1 − β , and X CMC represents drug's CMC in terms of mole fraction.…”