Magnetic Clay Sorbent for the Removal of Dyes from Aqueous Solutions
Background. Saponite is low-cost sorbent and is effective for removal of organic pollutants, dyes, heavy metal ions from water. However, saponite sorbents are not widely used. The saponite particles waste is removed from the solution after sorption process with considerable difficulties due to their high dispersion. To overcome this difficulty clay particles can be magnetized by magnetite, then by simple procedure (magnetic separation) removed from the water.
Objective. The purpose of this article is synthesis magnetically controlled sorbents based on saponite and magnetite (Fe3O4) by different schemes; the characterization of obtained sorbents and determination of their adsorption properties towards dyes; choice of magnetic module design.
Methods. In the paper modern physic-chemical and experimental research methods were used: X-ray fluorescence, X-ray analysis, physical adsorption/desorption of Nitrogen, sorption and magnetic separation process.
Results. It was found that magnetic modification (in an amount of 2 % magnetite by weight) of saponite by impregnation method allows obtaining mesoporous sorbents with good sorption and magnetic properties. The detected adsorption capacity of magnetically sorbents for all types of dyes (anionic, cationic and nonionic) was 1.5–2.5 times bigger than that for native saponite.
Conclusions. It is shown that modification of saponite by magnetite not only improves its magnetic properties, but also increases its absorption characteristics (specific surface area, sorption capacity). The impregnation method allows obtaining magnetic clay sorbent with better sorption and magnetic characteristics. The pyramid magnetic module was the most effective magnetic module design for deposition of spent magnetic sorbent.
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GOST Style Citations
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- Advanced treatment of textile wastewater towards reuse using a membrane bioreactor / M. Brik, P. Schoeberl, B. Chamam et al. // Process Biochem. – 2006. – 41. – Р. 1751–1757.
- Ramesh B.В., Parande A.K., Raghu S. Removal of a basic textile dye from aqueous solution by adsorption on regenerated clay // Procedia Engineering. – 2012. – 33. – Р. 303–312.
- Wawrzkiewicz M., Hubicki Z. Removal of tartrazine from aqueous solutions by strongly basic polystyrene anion exchange resins // J. Hazardous Mater. – 2009. – 164. – Р. 502–509.
- Dye and its removal from aqueous solution by adsorption: A review / M.T. Yagub, T.K. Sen, S. Afroze et al. // Adv. Colloid Interface Sci. – 2014. – 209. – Р. 172–184.
- Mui E.L. Dye adsorption onto activated carbons from tyre rubber waste using surface coverage analysis // J. Colloid Interface Sci. – 2010. – 347. – Р. 290–300.
- Rafatullah M. Adsorption of Methylene Blue on low-cost adsorbent // J. Hazardous Mater. – 2010. – 177. – Р. 70–80.
- Rytwo G. Use of CV- and TPP-montmorillonite for the removal of priority pollutants from water // Applied Clay Sci. – 2007. – 36. – Р. 182–190.
- Conceição V., Freire F.B., Carvalho K.Q. Treatment of textile effluent containing indigo blue dye by a UASB reactor coupled with pottery clay adsorption // Acta Scientiarum. Technol. – 2013. – 35. – Р. 53–58.
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