Open AccessSynthetic analogues of natural titanosilicate mesoporous minerals as potential functional materials. Synthesis and application
Author(s) -
А. И. Николаев,
Л. Г. Герасимова,
М. В. Маслова,
Е. С. Щукина
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/704/1/012003
Subject(s) - microporous material , crystallization , mesoporous material , chemical engineering , octahedron , ion exchange , materials science , hydrothermal circulation , hydrothermal synthesis , phase (matter) , inorganic chemistry , crystallography , crystal structure , chemistry , ion , catalysis , organic chemistry , engineering
Phase formation upon hydrothermal crystallization in the Na 2 O-TiO 2 -SiO 2 -H 2 SO 4 - H 2 O system has been studied in depth. The obtained results provided the basis for the development of technology for new types of ion-exchangers with the structure of the mineral ivanyukite - Na 4 (TiO) 4 (SiO 4 ) 3 4-6 H 2 O. It was shown that an excessive amount of Na and Si with respect to Ti (mol) and an alkaline medium up to pH 12 affect the rate of the ivanyukite crystallization. The optimal conditions producing the pure ivanyukite phase with designed structure, chemical composition and morphology have been found. The framework composes corner-sharing SiO 4 tetrahedra and TiO 6 octahedra linked through bridging oxygen atoms and provide pore system with channels containing H 2 O molecules and exchangeable Na + cations. The synthetic ivanyukite with wide-pore microporous framework is considered to be perspective cation-exchanger.