THE ACID-BASE PROPERTIES OF AMORPHOUS SILICA FROM STRAW AND RICE HUSK
UDC 633.584.6:661.68
Abstract
The present work shows results of studying acid-base properties of the surface by the methods of pH-metry and Hammett of amorphous silicon dioxide from rice husks and straw obtained by various schemes: oxidative firing; oxidative roasting with preliminary treatment with 0.1 M hydrochloric acid solution; precipitation from alkaline solutions. The samples obtained by the thermal method contain impurities of alkali, alkaline earth metals, aluminum, and aluminum and practically do not contain water. The composition of the deposited samples contains a small fraction of impurities (0.05%) and water - from 8.2 to 10.2%. The pH value of an aqueous suspension of silicon dioxide has a neutral, alkaline or acidic environment depending on the content of impurities of alkali and alkaline earth metals. Distribution of acid-base centers on the surface of the samples is nonmonotonic and heterogeneous, and manifests itself in discreteness with a fairly clear differentiation of sorption bands with maxima of different intensities corresponding to a certain pKa value. Distribution curves of the adsorption centers of the indicators on the surface of the samples of amorphous silicon dioxide are similar to each other. There are four types of active centers on their surface: acidic Lewis (pKa + 16.80), Bransted main (pKa +7.15 and +9.45) and acid (pKa + 2.50). The number of active centers depends on the preparation scheme and is determined by the content of impurity elements and water in the oxide samples.
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Patent 2319665 (RU). 2008. (in Russ.).
Drummond C., McCann R., Patwardhan S.V. Chemical Engineering Journal, 2014, vol. 244, no. 15, pp. 483–492. DOI: 10.1016/j.cej.2014.01.071.
Selyayev V.P., Kupriyashkina L.I., Kechutkina Ye.L., Gorenkov A.O. Vestnik povolzhskogo gosudarstvennogo tekhno-logicheskogo universiteta. Seriya: Materialy. Konstruktsii. Tekhnologii, 2018, no. 1, pp. 7–13. (in Russ.).
Demyanova L.P., Rimkevich V.S., Buynovskiy A.S. Journal of Fluorine Chemistry, 2011, vol. 132, no. 12, pp. 1067–1071. DOI: 10.1016/j.jfluchem.2011.06.003.
Zemnukhova L.A., Fedorishcheva G.A., Yegorov A.G., Sergiyenko V.I. Zhurnal prikladnoy khimii, 2005, vol. 78, no. 2, pp. 324–328. (in Russ.).
Zemnukhova L.A., Yegorov A.G., Fedorishcheva G.A., Barinov N.N., Sokol'nitskaya T.A., Botsul A.I. Neorganicheski-ye materialy, 2006, vol. 42, no. 1, pp. 27–32. (in Russ.).
Real C., Alcalá M.D., Criado J.M. Journal of the American Chemical Society, 1996, vol. 79, no. 8, pp. 2012–2016. DOI: 10.1111/j.1151-2916.1996.tb08931.x.
de Souza M.F., Magalhães W.L.E., Persegil M.C. Materials Research, 2002, vol. 5, no. 4, pp. 467–474. DOI: 10.1590/S1516-14392002000400012.
Liou T.-H., Chang F.-W., Lo J.-J. Industrial and Engineering Chemistry Research, 1997, vol. 36, no. 3, pp. 568–573. DOI: 10.1021/ie9604536.
Zemnukhova L.A., Panasenko A.Ye., Tsoy Ye.A., Fedorishcheva G.A., Shapkin N.P., Artem'yanov A.P., Mayorov V.YU. Neorganicheskiye mater, 2014, vol. 50, no. 1, pp. 82–89. (in Russ.).
Rohatgi K., Prasad S.V., Rohatgi P.K. Journal of Materials Science Letters, 1987, vol. 6, issue 7, pp. 829–831. DOI: 10.1007/BF01729027.
Luyi Sun, Kecheng Gong. Ind. Eng. Chem. Res., 2001, vol. 40, pp. 5861–5877. DOI: 10.1021/ie010284b.
Damodhar G., Prabir G. Journal of Water Process Engineering, 2017, vol. 19, pp. 156–163. DOI: 10.1016/j.jwpe.2017.07.025.
Arefieva O.D., Zemnukhova L.A., Morgun N.P., Rybin V.G., Tsvetnov M.A., Kovshun A.A., Panasenko A.E. Air, Soil and Water Research, 2015, vol. 8, pp. 59–65. DOI: 10.4137/ASWR.S31623.
Sheveleva I.V., Kholomeydik A.N., Voyt A.V., Zemnukhova L.A. Khimiya rastitel'nogo syr'ya, 2009, no. 4, pp. 171–176. (in Russ.).
Zemnukhova L., Kharchenko U., Beleneva I. International Journal of Environmental Science and Technology, 2014, no. 12, pp. 1495–1502. DOI: 10.1007/s13762-014-0529-8.
Yekimova I.A., Minakova T.S. Polzunovskiy vestnik, 2013, no. 1, pp. 67–71. (in Russ.).
Tanabe K. Tverdyye kisloty i osnovaniya. [Solid acids and bases]. Moscow, 1973, 184 p. (in Russ.).
Zakharova N.V., Sychev M.M., Korsakov V.G., Myakin S.V. Kondensirovannyye sredy i mezhfaznyye granits, 2011, vol. 13, no. 1, pp. 56–62. (in Russ.).
Minakova T.S. Adsorbtsionnyye protsessy na poverkhnosti tverdykh tel. [Adsorption processes on the surface of solids]. Tomsk, 2007, 283 p. (in Russ.).
Ikonnikova K.V. Teoriya i praktika rN-metricheskogo opredeleniya kislotno-osnovnykh svoystv poverkhnosti tverdykh tel. [Theory and practice of pH-metric determination of acid-base properties of the surface of solids]. Tomsk, 2011, 85 p. (in Russ.).
Certificate of state registration of the database 2019620391 (RU). 2019. (in Russ.).
Chukin G.D. Khimiya poverkhnosti i stroyeniye dispersnogo kremnezoma. [Surface chemistry and structure of dispersed silica]. Moscow, 2008, 172 p. (in Russ.).
Kholomeydik A.N. Polucheniye, sostav i svoystva kremniy- i uglerodsoderzhashchikh produktov pererabotki plodo-vykh obolochek risa : dissertatsiya kandidat khimicheskikh nauk. [Obtaining, composition and properties of silicon- and car-bon-containing products of processing of fruit husks of rice: dissertation candidate of chemical sciences]. Vladivostok, 2016, 136 p. (in Russ.).
Chuyko A.A., Tertykh V.A., Lobanov V.V. Meditsinskaya khimiya i klinicheskoye primeneniye dioksida kremniya. [Medical chemistry and clinical applications of silicon dioxide]. Kiev, 2003, 414 p. (in Russ.).
Pakhnutova Ye.A., Slizhov YU.G. Zhurnal fizicheskoy khimii, 2014, vol. 88, no. 7-8, pp. 1228–1232. DOI: 10.7868/s0044453714080226. (in Russ.).
Antoshkina Ye.G., Smolko V.A. Vestnik Yuzhno-ural'skogo gosudarstvennogo universiteta. Seriya Matematika, fizika, khimiya, 2008, issue 10, no. 7, pp. 65–68. (in Russ.).
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