Treatment of wastewater containing alizarin red dye: development and application of magnetic chitosan as a natural eco-friendly material

The efficient removal of harmful dyes from wastewater, employing green methods, is a subject of growing interest. Anthraquinone dyes alizarin red (AR) S and methyl orange (MO) were used as model pollutants in this investigation, and magnetic chitosan particles were used to extract them from aqueous...

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Bibliographic Details
Published inClean technologies and environmental policy Vol. 25; no. 3; pp. 865 - 878
Main Authors Vedula, Shivani S., Yadav, Ganapati D.
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 01.04.2023
Springer Nature B.V
Subjects
Adsorbents
Adsorption
Alizarin
Anthraquinone
Anthraquinone dyes
Aqueous solutions
Chitosan
Color removal
Dyes
Earth and Environmental Science
Environment
Environmental Economics
Environmental Engineering/Biotechnology
Environmental policy
Industrial and Production Engineering
Industrial Chemistry/Chemical Engineering
Original Paper
Property
Recycling
Selective adsorption
Sustainable Development
Wastewater treatment
Dye removal
Adsorption
Methyl orange
Alizarin red S
Magnetic chitosan
Sustainable process
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Summary:The efficient removal of harmful dyes from wastewater, employing green methods, is a subject of growing interest. Anthraquinone dyes alizarin red (AR) S and methyl orange (MO) were used as model pollutants in this investigation, and magnetic chitosan particles were used to extract them from aqueous solution. SEM–EDX, XRD, FTIR ATR, and TGA DSC were used to examine the physicochemical, thermal, and morphological properties of the synthesized material. The effect of pH, dye concentration, duration, and adsorbent loading on dye degradation was examined. After adsorption, the material could be easily separated with the assistance of an external magnet. The selective adsorption of alizarin red S dye to methyl orange was studied in single and binary solutions. The dye uptake capacity provided by the use of the pseudo-second-order model is higher as compared to the pseudo-first order. The dye was adsorbed at 201.5 mg/g for 120 min. The batch adsorption followed the Freundlich isotherm ( R 2  = 0.995) with alizarin red adsorption being endothermic with the presence of multimolecular layer adsorption. Desorption efficiency decreases to 90% after the first cycle. For repeated usage, the material proved to be extremely stable and easy to recycle. The adsorption mechanism of AR and MO dye removal by magnetic chitosan adsorbent is proposed. Graphical abstract
ISSN:1618-954X
1618-9558
DOI:10.1007/s10098-022-02408-9