Open AccessRole of Water in the Transformation of Protonated Titanate Nanoribbons to Anatase Nanoribbons
Author(s) -
Melita Sluban,
Polona Umek
Publication year - 2019
Publication title -
the journal of physical chemistry c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.401
H-Index - 289
eISSN - 1932-7455
pISSN - 1932-7447
DOI - 10.1021/acs.jpcc.9b08225
Subject(s) - anatase , hydrothermal circulation , titanate , chemical engineering , protonation , materials science , dissolution , nucleation , counterion , nanotechnology , chemistry , catalysis , organic chemistry , photocatalysis , ion , composite material , ceramic , engineering
Transformation of layered protonated titanate (H2Ti3O7) nanoribbons to anatase nanoribbons under hydrothermal conditions is a catalyzed process where topotactic transformation and dissolution–recrystallization compete. In the present work, the transformation was achieved with sufficiently high thermal input, calcination, or catalysis when performed under hydrothermal conditions. X-ray diffraction and scanning and transmission electron microscopy combined with crystallography of product materials revealed that the success of catalysis depended on the suspension’s pH value as well on the counterions present in the reaction mixture. The process of the transformation from protonated titanate to anatase under hydrothermal conditions is explained for the reaction medium pH range of 1–13.7 with the aid of the ζ-potential of protonated titanate nanoribbons. Protonated titanate nanoribbons were stable under basic conditions, and their transformation to anatase nanoribbons depended on the counterions present in the...
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