Abstract
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 (Fe 3 O 4 ) 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.
Highlights
The rapid development of textile, light, printing and other industries raises the question of wastewater purification of organic dyes which relate mainly to highly toxic substances
The purpose of this article is synthesis of 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
The natural saponite clay is used for synthesis of magnetically sorbents (MCS)
Summary
The rapid development of textile, light, printing and other industries raises the question of wastewater purification of organic dyes which relate mainly to highly toxic substances. The dyes removal methods are included: coagulation [1], oxidative methods [2], biological treatment [3], sorption methods [4] and so on Among these methods the adsorption is the most effective for deep removal of dyes from aqueous solutions [5]. 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, by simple procedure (magnetic separation) removed from the water. 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 impregnation method allows obtaining magnetic clay sorbent with better sorption and magnetic characteristics.
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