The sorption properties of natural and complex sorbents for neutralization of Ni2+ ions from the water environment were studied. The isotherm of the adsorption of Ni2+ ions on complex sorbents (activated bentonite to shungite is 1:1) according to the Langmuir and Freundlich’s models was drawn; the type of adsorption isotherms according to the S. Brunauer's classification was established. The values of the maximum sorption capacity of Гmax sorbents relative to Ni2+ ions were calculated. Based on the calculated coefficients of the Langmuir and Freundlich's equations, the specificity of the process of sorption of Nickel ions with the formation of a monomolecular layer was determined. The dependences of the degree of absorption of Ni2+ ions by complex sorbents on the duration of the sorption process were obtained. The ratio of solid state of matter (comprehensive sorbent) to liquid was experimentally determined.
 Malovanyy M., Vronska N., Koval I., Sakalova G. : Bull. Lviv Polytechnic National Univ.: Chem., technol. of substan. and their appl., 2013, 761, 280 (in Ukrainian).
 Kontsur A., Sysa L., Shevchuk L.: Physics and chemistry of solid state, 2018, 19 (2), 191. https://doi.org/10.15330/pcss.19.2.191-196
 Riabchevskyi O., Matvieieva O.: Ecolog. Safety and Balanc. Use of Res., 2015, 2, 106.
 Gaouar- Yadi M., Tizaoui K., Gaouar-Benyelles N., Benguella B.: Indian J. Chem. Technol., 2016, 23, 204.
 Sabino De Gisi, Giusy Lofrano , Grassi M., Notarnicola M..: Sustainable Mater.Technol., 2016, 9, 10.
 Zhao X.,. Song L., Zhang Z.,. Wang R .J. Fu: J. Molec. Struct., 2011, 986, 68.
 Repo E., Petrus R., Sillanpaa M., Warchoł J.K.: Chem. Eng. J., 2011, 172(1), 376.
 Shpylevskyi M.., Shpylevskyi Yе.., Stelmakh V.: J. Eng. Physics, 2001, 76 (6), 25.
 Berezkin V.: . Uhlerod. Zamknuti nanochastyny, makrostruktury, materialy. «AtrЕrho», 2013.
 Sydorchuk O., Humnytskyi Ya.: Eastern-European J. Enterprise Technol., 2013, 4/10 (64), 19.
 Petrushka I., Malovanyy M., Petrushka K.: Visn. KrNU im. M. Ostrohradskoho 2013, 2, 129.
 Petrushka I., Ruda M., Hyvliud A., Koval N.: Sci. Bull. UNFU, 2019, 29 (3), 64. https://doi.org/10.15421/40290314