Magnetic adsorbent based on Fe3O4 nanoparticles and chemically modified silica: preparation and properties
Abstract
Magnetite (Fe3O4) nanoparticles sorbtion from methanol solutions in its concentration equal to 5.5 mg/cm3 for magnetic sorbents obtaining on the basis of commercially available chemically derivatized silica (CDS) is proposed. Silica chemically modified by iminodiacetic acid groups (CDS-IDA) and silica modified by hexadecile groups (CMS-C16) were used as original sorbents. It is found that magnetic sorbent CDS- IDA/Fe3O4 synthesized in optimal conditions has the same sorption ability towards Cu2+ ions as an original sorbent. Copper sorption percentage in the optimal pH range of 2 – 6 is equal to 60 – 70%, and diffuse reflec- tance spectra of these sorbents have an absorption band at 680-720 nm.
Sorption of anionic synthetic dye “Solid green” on magnetic sorbents obtained on the basis of CDS- C16 with the different matrix structure characteristics is investigated (pore size 50, 25, 10 and 6 nm). It was preliminary found that the settling time of adsorption equilibrium on magnetic sorbents was 30 min. It is shown that properties of synthesized magnetic sorbents depend on original CDS pore size. It was found that effectivity of dye extraction on the magnetic sorbents CDS-C16/Fe3O4 (degree of extraction 92%) is equal to effectivity on original sorbents with 10 – 50 nm pore size. Decrease of pore size to 6 nm leads to decrease of extraction extent from 74 % down to 30% on the magnetic sorbent in comparison with the original one. Probably, because of small pore size the magnetic particles can occupy adsorption sites, decreasing effective- ness of the dye extraction.
Downloads
References
2. Tolmacheva V.V., Apyari V.V., Kochuk E.V., Dmitrienko S.G., J. Analyt. Chem., 2016, Vol. 71, No 4, pp. 321-348. DOI: 10.1134/S1061934816040079.
3. Xie L., Jiang R., Zhu F., Liu H. Et al., J. Anal. Bioanal. Chem., 2014, Vol. 406, pp. 377- 399. DOI: 10.1007/s00216-013-7302-6.
4. Herrera-Herrera A.V., Hernández-Borges J., Afonso M.M., Palenzuela J.A. et al., Talanta, 2013, Vol. 116, pp. 695-703. DOI: 10.1016/j.talanta.2013.07.060.
5. Pastukhov A.V., Davankov V.A, Volkov V.V., Amarantov S.V. et al., J. Polym. Res., 2014, Vol. 21, pp. 406-416. DOI: 10.1007/s10965-014-0406-7.
6. Tolmacheva V.V., Apyari V.V., Ibragimova B.N. et al., J. Analyt. Chem., 2015, Vol. 70, pp. 1313-1321. DOI:10.1134/S1061934815110155.
7. Petrakova A.V., Urusov A.E., Kostenko S.N., Pridvorova S.M. et al., Scientific review. Chemical Sciences, 2014, No 1, pp. 28-29.
8. Podchaynova V.I., Simonova L.N. Analyti- cal chemistry of elements. Copper. M., Nauka Publ., 1990, 278 p.
9. Kortyum G., Braun V., Gertsog G., Usp. Fiz. Nauk, 1965, Vol. 85, pp. 365-379. DOI: 10.3367/UFNr.0085.196502f.0365.
10. Lisichkin G.V., Fadeev A.Y., Cerdan A.A., Nesterenko P.N. et al., Chemistry of Sur- face Grafted Compounds. M.: Fizmatlit., 2003, 592 p.
11. Tikhomirova T.I., Ramazanova G.R., Apyari V.V., Food Chem., 2017, Vol. 221, pp. 351-355. DOI:
10.1016/j.foodchem.2016.10.042.
