Separation of Some Anionic Dyes Using Reverse Micelles of CTAB and SDS as Efficient Surfactants Adsorbents from Aqueous Medium

Heba M El Refay,Nagwa Badawy,El Shimaa Hassen,Amina Hamada,Sébastien Déon

doi:10.1155/2022/7484479

Heba M El Refay, Nagwa Badawy + Show 3 more

Open Access

https://doi.org/10.1155/2022/7484479

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Abstract

Extractive removal of anionic dyes, namely, Color Index (CI) Reactive Blue 222 and Reactive Yellow 145, using reverse micelles based on liquid-liquid extraction (LLE) was carried out from aqueous solutions using different anionic and cationic surfactants (e.g., sodium dodecyl sulfate (SDS) and cetyltrimethylammonium bromide (CTAB), resp.), which dissolved in ethyl acetate as solvent. The reverse micelle principal acts on the dye encapsulated in the solvent in an aqueous micropool. The experiments were carried out by mixing in a simple mixer a given amount of dyes and surfactants dissolved in a solvent in an aqueous process. Due to gravity, the dye is separated from water after the solvent phase is separated from the aqueous phase, including dye encapsulated in reverse micelles. Under various experimental conditions, extraction efficiency was studied, including solution pH, extraction time, initial dye concentration, extractant concentration, temperature, stripping agent, and solvent reusability. Dyes extracted were stripped quantitatively with NaOH solution. Recovery of the solvent and the reuse of dyes and surfactants after extraction of dye molecules from reverse micelles surfactant core considered are very important from an economic point of view. The optimized conditions were 7 ± 0.2 solution pH, 9 × 10−2 mol/L extractant concentration, 1M NaOH stripping agent concentration, 60 min extraction time, 6 × 10−5 mol/L dye concentration, and 1 : 1 aqueous to organic (A/O) ratio. 87–93% of dyes were extracted at experimental optimum conditions.

Highlights

Dyes are organic compound and highly colored, so the extract of colors from aqueous environments is one of the most challenging criteria faced by the manufacture of dye, resulting in significant environmental problems
When using the cationic Cetyltrimethylammonium bromide (CTAB) to shape reversed micelles in the solvent of ethyl acetate, the removal of negatively charged RB222 and RY145 was favored. e molecules of dye are encapsulated inside the center and around the reversed micelles produced by head group of cationic CTAB during stirring of the organic solvent and the aqueous phase mixture because the negative charges of RB222 and RY145 were attracted electrostatically to the head of the cationic CTAB group, in agreement with literature [26]
Back dye extraction from ethyl acetate into water was successfully accomplished by applying a counter ionic surfactant to the water. e formation of reverse micelles in ethyl acetate is supported by all this evidence

Summary

Introduction

Dyes are organic compound and highly colored, so the extract of colors from aqueous environments is one of the most challenging criteria faced by the manufacture of dye, resulting in significant environmental problems. Numerous researchers have studied various techniques, including micellar enhanced ultrafiltration, [1] adsorption, [2] flocculation [3], and precipitation [4], for removal of colored dyes from aqueous environments. All these mentioned techniques have been contrasted, but each showed both advantages and disadvantages. E extraction of dye contamination from aqueous environments using LLE process, resulting from reverse of micelle extraction (RME), is the focus of this study. RME occurs when a substrate in water-immiscible solvent is extracted from aqueous phase to the organic phase by reverse micelles as shown in Figure 1 [12]. Ethyl acetate is favored since it has demonstrated a quicker separation of kinetics from the aqueous phase

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