|Siryk, OO |
1F.D. Ovcharenko Institute of Biocolloidal Chemistry of the NAS of Ukraine, Kyiv
|Dopov. Nac. akad. nauk Ukr. 2019, 6:54-60|
This paper deals with the study of the adsorption properties of polyvinylformal (PVF). A highly porous sponge sorbent based on polyvinylformal, as well as filled sorbents with additives of carbon nanotubes, laponite, and aminopropyl aerosil (APA), is synthesized. The adsorption patterns on the obtained sorbents for different dyes (cationic — methyl violet, anionic — azorubine, and non-ionic — nigrosine) are studied. It is established that the polyvinylformal sorbent removes azorubine at pH < 4 and methyl violet at pH > 4. Аdsorption equilibrium for all sorbents during the sorption of dyes is reached in 15-30 min. PVF filled with aminopropyl aerosil showed the highest sorption capacity toward azorubine and nigrosine and amounts to 11.4 and 7.1 mg/g, respectively, for methyl violet — unfilled PVF (5.0 mg/g). The kinetic measurements for all the composites and dyes indicate that the adsorption process follows the pseudo-second order kinetics. To describe the obtained adsorption isotherms of methyl violet on all sorbents and azorubine on pure PVF and PVF-APA, the Langmuir theoretical model fits better. In the case of nigrosine on all sorbents and azorubine on PVF filled with carbon nanotubes and laponite, the Freundlich model is preferable.
|Keywords: dyes, polymer sponge, polyvinylformal, sorption|
1. Yagub, M. T., Sen, T. K., Afroze, S. & Ang, H. M. (2014). Dye and its removal from aqueous solution by adsorption: a review. Adv. Colloid Interface Sci., 209, pp. 172-184. doi: https://doi.org/10.1016/j.cis.2014.04.002
2. Ptaszkowska-Koniarz, M., Goscianska, J. & Pietrzak, R. (2017). Adsorption of dyes on the polymer nanocomposites modified with methylamine and copper(II) chloride. J. Colloid Interface Sci., 504, pp. 549-560. doi: https://doi.org/10.1016/j.jcis.2017.06.008
3. Sandeman, S. R., Gun’ko, V. M., Bakalinska, O. M., Howell, C. A., Zheng, Y., Kartel, M. T., Phillips, G. J. & Mikhalovsky, S. V. (2011). Adsorption of anionic and cationic dyes by activated carbons, PVA hydrogels, and PVA/AC composite. J. Colloid Interface Sci., 358, pp. 582-592. doi: https://doi.org/10.1016/j.jcis.2011.02.031
4. Li, P., Siddaramaiah, Kim, N. H., Yoo, G.-H. & Lee, J.-H. (2009). Poly(acrylamide/laponite) nanocomposite hydrogels: swelling and cationic dye adsorption properties. J. Appl. Polym. Sci., 111, pp. 1786-1798. doi: https://doi.org/10.1002/app.29061
5. Samchenko, Yu., Korotych, O., Kernosenko, L., Kryklia, S., Litsis, O., Skoryk, M., Poltoratska, T. & Pasmurtseva, N. (2018). Stimuli-responsive hybrid polymers based on acetals of polyvinyl alcohol and acrylic hydrogels. Colloids Surf. A, 544, pp. 91-104. doi: https://doi.org/10.1016/j.colsurfa.2018.02.015
6. Kryklya, S., Samchenko, Yu., Konovalova, V., Poltoracka, T., Pasmurceva, N. & Ulberg, Z. (2016). Hybrid pHand thermosensitive hydrogels based on polyvinylalcohol and acrylic monomers. Magisterium. Iss. 63, Chemical sciences, pp. 20-28 (in Ukrainian).
7. Dawodu, M. O., Akpomie, K. G. (2016). Evaluation of potential of a Nigerian soil as an adsorbent for tartrazine dye: Isotherm, kinetic and thermodynamic studies. Alexandria Eng. J., 55, pp. 3211-3218. doi: https://doi.org/10.1016/j.aej.2016.08.008