INVESTIGATION OF THE PROCESS OF FLUORIDE IONS ADSORPTION BY NATURAL SORBENTS

EP.
2021;
: pp.181-187
1
Lviv Polytechnic National University
2
Lviv Polytechnic National University
3
Lviv Polytechnic National University

A detailed analysis of literature sources on the content of fluorides in the environment, methods of conditioning and defluoridation of water was held. The mechanism of interaction of fluorides with zeolite in the process of adsorption treatment of wastewaters and domestic waters was clarified. It was first established that in the process of adsorption there is the formation of magnesium fluoride compounds due to the binding of cations extracted from the zeolite by the mechanism of ion exchange. The mechanism of chemisorption of fluoride ions by the formation of insoluble CaF2 was also proved. According to the results of experimental research, a technological scheme has been developed, which provides the preliminary treatment of fluoride ions in the form of complexes with aluminium. In order to prevent the permeation of aluminium fluoride into the treated water, a stage of adsorption water purification was proposed. Calculations of the amount of reagent necessary to ensure the required degree of purification of water from fluoride ions were done. The statistical parameters of the process and the significance of the obtained results were calculated. The coefficient of determination of experimental data was 0.87… 0.99, the standard deviation was 0.017… 0.026.

1. Bazrafshan, E., Balarak, D., Panahi, A. H., Kamani, H., & Mahvi, A. H. (2016). Fluoride removal from aqueous solutions by cupricoxide nanoparticles. Fluoride49(3), 233.

2. Borgohain, X., Boruah, A., Sarma, G. K., & Rashid, M. H. (2020). Rapid and extremely high adsorption performance of porous MgO nanostructures for fluoride removal from water. Journal of Molecular Liquids, 305, 112799. doi: https://doi.org/10.1016/j.molliq.2020.112799

https://doi.org/10.1016/j.molliq.2020.112799

3. Çengeloğlu, Y., Kır, E., & Ersöz, M. (2002). Removal of fluoride from aqueous solution by using red mud. Separation and purification Technology28(1), 81-86. doi: https://doi.org/10.1016/S1383-5866(02)00016-3

https://doi.org/10.1016/S1383-5866(02)00016-3

4. He, Y., Zhang, L., An, X., Wan, G., Zhu, W., & Luo, Y. (2019). Enhanced fluoride removal from water by rare earth (La and Ce) modified alumina: Adsorption isotherms, kinetics, thermodynamics and mechanism.  Science of the total environment688, 184-198. doi:  https://doi.org/10.1016/j.scitotenv.2019.06.175

https://doi.org/10.1016/j.scitotenv.2019.06.175

5. Hyvlud, A., Sabadash, V., Gumnitsky, J., & Ripak, N. (2019). Statics and kinetics of albumin adsorption by natural zeolite. Chemistry & Chemical Technology, 13(1), 95-100. doi: https://doi.org/10.23939/chcht13.01.095

https://doi.org/10.23939/chcht13.01.095

6. Kang, D., Yu, X., & Ge, M. (2017). Morphology-dependent properties and adsorption performance of CeO2 for fluoride removal. Chemical Engineering Journal, 330, 36-43. doi: https://doi.org/10.1016/j.cej.2017.07.140

https://doi.org/10.1016/j.cej.2017.07.140

7. Mahmoudi, M. M., Nasseri, S., Mahvi, A. H., Dargahi, A., Khubestani, M. S., & Salari, M. (2019). Fluoride removal from aqueous solution by acid-treated clinoptilolite: isotherm and kinetic study. Desalination and Water Treatment146, 333-340. doi: https://doi.org/ 10.5004/dwt.2019.23625

https://doi.org/10.5004/dwt.2019.23625

8. Maity, J. P., Hsu, C. M., Lin, T. J., Lee, W. C., Bhattacharya, P., Bundschuh, J., & Chen, C. Y. (2018). Removal of fluoride from water through bacterial-surfactin mediated novel hydroxyapatite nanoparticle and its efficiency assessment: adsorption isotherm, adsorption kinetic and adsorption thermodynamics. Environmental nanotechnology, monitoring & management, 9, 18-28. doi: https://doi.org/10.1016/j.enmm.2017.11.001

https://doi.org/10.1016/j.enmm.2017.11.001

9. Saha, S. (1993). Treatment of aqueous effluent for fluoride removal. Water Research, 27(8), 1347-1350. doi: https://doi.org/10.1016/0043-1354(93)90222-4

https://doi.org/10.1016/0043-1354(93)90222-4

10. Sabadash, V.V. (2019). Theoretical bases of sorption processes on natural and synthetic sorbents. (Dysertatsiia doktora tekhnichnykh nauk). Lviv Polytechnic National University, Lviv.

11. Sabadash, V., Gumnytskyy, J., Mylianyk, O., & Romaniuk, L. (2017). Concurrent sorption of copper and chromium cations by natural zeolite. Environmental problems2(1), 33-36.

https://doi.org/10.15421/40270129

12. Sabadash V. (2013). Innovative development trends in modern technical scienses: problems and prospects: Adsorptive removal of fluorides from waste water. B & M Publishing, San Francisco, California, USA.

13. Srivastav, A. L., Singh, P. K., Srivastava, V., & Sharma, Y. C. (2013). Application of a new adsorbent for fluoride removal from aqueous solutions. Journal of Hazardous materials, 263, 342-352. doi: https://doi.org/10.1016/j.jhazmat.2013.04.017

https://doi.org/10.1016/j.jhazmat.2013.04.017

14. Tor, A. (2006). Removal of fluoride from an aqueous solution by using montmorillonite. Desalination201(1-3), 267-276. doi: https://doi.org/10.1016/j.desal.2006.06.003

https://doi.org/10.1016/j.desal.2006.06.003