Influence of interfacial, thermodynamic and hydrophobic parameters on Acid Red 57 removal by ionic micellar flocculation

Most dyes are complex organic molecules that are highly resistant to degradation and may cause severe damage to live organisms and photosynthetic activities. In this respect, the aim of the present study was to assess the influence of interfacial, thermodynamic and hydrophobic parameters on Acid Red...

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Bibliographic Details
Published in:Separation science and technology 2022-07, Vol.57 (11), p.1825-1836
Main Authors: Kalline Gomes Carvalho Barros, Giselle, Duarte, Lindemberg de Jesus Nogueira, Melo, Ricardo Paulo Fonseca, Bezerra Lopes, Francisco Wendell, Neto, Eduardo Lins de Barros
Format: Article
Language:English
Subjects:
Acid Red 57
Anionic surfactant
Aqueous solutions
Carbon 14
Carbon isotopes
Color removal
Dyes
Flocculation
Hydrophobicity
interfacial properties
ionic flocculation
micellar flocculation
Micelles
Organic chemistry
Parameters
Photosynthesis
Removal
Sodium
Sodium dodecanoate
Solubilization
Surfactants
Temperature
thermodynamic properties
Thermodynamics
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Summary:Most dyes are complex organic molecules that are highly resistant to degradation and may cause severe damage to live organisms and photosynthetic activities. In this respect, the aim of the present study was to assess the influence of interfacial, thermodynamic and hydrophobic parameters on Acid Red 57 removal from aqueous media by ionic micellar flocculation using surfactants sodium dodecanoate (C12), sodium tetradecanoate (C14) and sodium hexadecanoate (C16). The results demonstrate that an increase in the hydrophobic nature of the surfactant provokes different Krafft (T krafft ) temperature and critical micelle concentration behaviors, and the greater the hydrophobicity the higher the solubilization temperature and lower the concentration needed for micelle formation. It was also found that long-chain surfactants cause an increase in the area of the polar part of the surfactant and change the micelle shape from lamellar (C12, C14) to cylindrical (C16), interfering in the solubilization capacity of the micelles. Micelle diameter determination aimed at demonstrating that the dye is solubilized inside the micelles via hydrophobic interactions. The dye removal tests showed that an increase in surfactant concentration improves process efficiency, surfactant C12 exhibiting the best dye removal indices (around 90%). Thermodynamic parameters showed that ionic micellar flocculation is exothermic and non-spontaneous.
ISSN:0149-6395
1520-5754
DOI:10.1080/01496395.2021.2002896