Interaction of the superabsorbent "Solid water" modified by zinc and manganese ions with water
Abstract
One of the problems being discussed in the agricultural sector is climate change and global warming,
which lead to the expansion of arid areas and changes in soils. These lead to increased agricultural risks in
these areas. Traditional methods of irrigation and application of mineral fertilizers and trace elements are not always available and effective. For the economic benefit and intensification, a previously synthesized rarecross-linked polymer material with the properties of the "Solid water" superabsorbent can be used as a reservoir to maintain the required humidity level and to introduce the necessary trace elements into the soil.
This paper studies the hydration properties of samples of the "Solid water" superabsorbent modified
with zinc sulphate and manganese sulphate (II) salts. The purpose of the research was to clarify and correct earlier results of the hydration of samples of the "Solid water" sorbent, as well as to establish the effect of electrolytes ZnSO4 and MnSO4 as trace elements on the absorption of water by the superabsorbent. The experiment determined the ability of modified sorbent samples to absorb moisture. Also, a method to determine the establishment of energy parameters of hydrogen bonds in the superabsorbent – water system was proposed. A universal spectrum processing program (UPOS) based on IR spectroscopy data was used for this purpose. A possible variant of the formation of water – metal ion hydroxocomplexes in the phase of a sorbent modified with trace elements was proposed.
The study showed that the highest energy of hydrogen bonds is characteristic of hydroxocomplexes
with the participation of carboxylate or carboxyl groups in the sorbent matrix. To increase the amount of water absorbed by the superabsorbent, it is necessary to use it in a cationic or an anionic form. For the first time, the formation of monodentate and bidentate ligands was established during the interaction of the superabsorbent with zinc sulfate ions in a solution. It was found that more stable associates are formed by Zn2+ ions with COOH-and amino groups, compared to Mn2+ ions. IR spectroscopy data confirm that the moisture absorption of a superabsorbent with ZnSO4 is 490 dm3 per kilogram of polymer, while with MnSO4 it is only 390 dm3/kg.
Downloads
References
Kuznetsov V.A., Selemenev V.F., Semenov V.N., Bakalova M.V., Russian patent No 2574722. Publ. 10.02.2016 BI №4.
Semenov V.N., Zenishcheva A.V., Selemenev V.F., Kuznetsov V.A. et al, Sorbtsionnye i khromatograficheskie protsessy, 2018, No 5, pp. 690-695.
Zenishcheva A.V., Semenov V.N., Kuznetsov V.A., Kushchev P.O., Condensed media and interfacial boundaries, 2020, No 1, pp. 66-74.
Dekhant I., Dants R., Kimmer V., Shmol'ke R. Infrared spectroscopy of polymers, M., Chemistry, 1976, 472 p.
Karyakin A.V., Kriventsova G.A. State of water in organic and inorganic compounds, M., Nauka, 1973, 174 p.
Iogansen A.V. Hydrogen bonding, M., Nauka, 1981, pp. 112-155.
Pimentel Dzh., Mak-Klellan O. Hydrogen bond, M., Mir, 1964,462 p.
Uglyanskaya V.A. Chikin G.A., Selemenev V.F., Zav'yalova T.A. Infrared spectroscopy of ion-exchange materials. Voronezh, VSU, 1989, 207 p.
Kazitsyna L.A., Kupletskaya N.B. Application of UV, IR and NMR spectroscopy in organic
chemistry, M., Higher school, 1971, 264 p. 10. Bull H.B., Breese K. Protein hydration. Archives
of Biochemistry and Biophysics, 1968, pp. 488-496.
Selemenev V.F. Rudakov O.B., Slavinskaya G.V., Drozdova N.V., Pigments for food production. Melanoidins, M., Delhi print, 2008, 246 p.
Selemenev V.F., Chikin G.A., Khokhlov V.Yu. Ion-exchange, New York, Marsel Dekker, 2000 pp. 851-925.
Kucherov A.P., Kochubei S.M., Journal. Applied. Spectroscopy, 1983, Vol. 38, No 1, pp. 146-150.
Kucherov A.P. Zhurn. Applied spectroscopy, 1984, Vol. 41, No 1, pp 79-82.
Universal spectrum processing program (UPOS) / Kucherov A.P., Kravets B.K., Serdyuk L.A., i dr. // GosFAP, №50850000513 ot 17.06.1985.
Tsundel' G., Hydration and intermolecular interaction, M., Mir, 1972, 404 p.
Selemenev V.F. Khokhlov V.Yu., Bobreshova O.V., Aristov I.V., Kotova D.L., Physico-chemical bases of sorption and membrane methods of separation and separation of amino acids, Voronezh, VSU, 300 p.
Nakamoto K. IR spectra and RAMAN spectra of inorganic and coordination compounds, M., Mir, 1991, 536 p.
Umland F., Yansen A., Tirig D., Vyunsh G., Complex compounds in analytical chemistry, M., Mir, 1975, 531 p.
