Surface modification of the adsorbent for the purification of water by ions of aluminium and silver
Abstract
Based on industrial chemically pure homogeneous and widely porous silica C-120, by modifying its surface with cations of aluminum and silver, adsorbents with a high adsorption potential to a number of possible impurities in drinking water have been created. Adsorption properties were studied by the method of nonlinear gas chromatography, which makes it possible to describe an inhomogeneous sorption field. Adsorption of n-hexane, benzene, chlorobenzene, cumene, chloroform, carbon tetrachloride, alcohols, water, tetrachloramine was studied on the initial and modified adsorbents. The obtained materials were compared with silochrome modified with silver nanoparticles, sample C-3,2-Ag0, and activated coconut coal AU used in the Barrier cartridges. Aluminum was applied by impregnating silochrome with a solution of aluminum nitrate nanohydrate and subsequent thermolysis at 200 ° C, a sample of C-Al. Aluminosilicate proton-donor and electron-withdrawing strong-acid centers of Brеnsted and Lewis, capable of very strong adsorption interactions, appear on the surface of silica, and the size of its surface, pore volume and diameter practically do not decrease, remaining available for sorption of large molecules of surfactants, proteins and microorganisms. The C-Al adsorbent grafted on the surface with aluminosilicate centers (concentration ~ 2 mkmol/g) exhibits an adsorption potential with respect to both specifically and nonspecifically sorbed substances, much greater than that for AU and C-3,2-Ag0. Silver was applied to C-120 and C-Al by ion exchange from a solution of silver nitrate, samples of C-Ag+ and C-Al-Ag+. In both cases, the hydrophilicity and sorption capacity of alcohols, acetone, and other specifically sorbed substances were increased. In this case, the effect of modifying the surface of C-120 with silver cations, a sample of C-Ag +, is comparable in strength to the effect of modifying silica by metal nanoparticles, C-3,2-Ag0. The C-Al-Ag+ adsorbent exhibits somewhat greater hydrophilicity than C-Al, but the adsorption potential with respect to nonspecifically sorbed substances still remains at a very high level, exceeding that of AU and other silicas. Amines that model proteins, peptides, some viruses, on C-Ag +, C-Al and C-Al-Ag + are sorbed irreversibly even at 180°C. Thus, silica modified with cations of aluminum and silver, according to gas chromatography, can be effective as an adsorbent for purifying drinking water and is a promising alternative to activated carbons
Downloads
References
2. Kotel'nikova T.A., Kuznecov B.V., Moreva A.A. et al., Sorbtsionnye i khromatograficheskie protsessy, 2012, Vol. 12, No 2, pp. 295-303.
3. Kotel'nikova T.A., Kuznecov B.V., Moreva A.A. et al., Sorbtsionnye i khromatograficheskie protsessy, Vol. 12, No 4, pp. 523-531.
4. Sertifikat SUTCLIFFE SPEAKMAN CFRBONS LTD.
5. Lur'e A.A., Khromatograficheskie materialy, M., Himija, 1978, pp. 439.
6. Sposob obezzarazhivanija pit'evoj vody. Patent na izobretenie №2381182. Zolotuhina E.V., Kravchenko T.A., Ferapontov N.B., Gridneva E.V., Grabovich M.Ju. Patentoobladatel': Gosudarstvennoe obrazovatel'noe uchrezhdenie vysshego professional'nogo obrazovanija "Voronezhskij gosudarstvennyj universitet" (RU). Data registracii: 21.04.2008. Nomer zajavki: 2008115682/15.
7. Greg S., Sing K. Adsorbtsija, udel'naja povernost', poristost'. Pod red. ch.-k. AN SSSR Chmutova K.V., M., Mir, 1970, 255 p.
8. Kiselev A.V., Lygin V.I., Infrakrasnye spektry poverhnostnyh soedinenij, M., Nauka, 1972, рр. 403.
9. Tessman A.B., Ivanov A.V, Vakshtejn M.S. et al., Vestn. Mosk. Un-ta. Ser.2.Himija, 2002, Vol. 43, No 1, pp. 13-16.
10. Bajgubekova T.A, Kiselev A.V., Nikitin Yu.S., Kinetika i kataliz, 1972, Vol. 13, No 3, pp. 755-761.
11. Kotel'nikova T.A., Kuznecov B.V., Moreva A.A. et al., Zhurn. Fizich. Himii, 2013, Vol. 87, No 8, pp. 1379-1384.
12. Kotel'nikova T.A., Zhurn. Fizich. Himii, 2017, Vol. 91, No 7, pp. 1193-1200.
13. Kotel'nikova T.A., Kuznecov B.V., Murav'eva G.P., Sorbtsionnye i khromatograficheskie protsessy, 2009, Vol. 9, No 1, pp. 147-153.
14. Kotel'nikova T.A., Kuznecov B.V., Murav'eva G.P., Sorbtsionnye i khromatograficheskie protsessy, 2009, Vol. 9, No 3, pp. 399-407.
15. Mignolet J.C.P., J.Chem.Phys., 1953, Vol. 20, pp. 1298.
16. Jeksperimental'nye metody v adsorbcii i molekuljarnoj hromatografii. Pod red. Ju.S. Nikitina i R.S. Petrovoj. M., Izd-vo MGU, 1990, pp. 316.
17. Kotel'nikova T.A., Zhurn. Fizich. Himii, 2017, Vol. 91, No 10, pp. 1792-1798.
18. Wierenga P.A., Meinders M.B.J., Egmond M.R. et al., J. Phys. Chem. B, 2005, Vol. 109, No 35, pp. 16946-16952
