Premium
Reversing the Photocatalytic Activity Orders of Anatase TiO 2 Facets by Surface Treatment
Author(s) -
Lei Yanqiang,
Lu Xiaoqing
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201601325
Subject(s) - photocatalysis , anatase , calcination , x ray photoelectron spectroscopy , materials science , hydrofluoric acid , aqueous solution , hydrothermal circulation , chemical engineering , inorganic chemistry , nanotechnology , catalysis , chemistry , organic chemistry , metallurgy , engineering
Although the photocatalytic activities of the different facets of anatase TiO 2 have been investigated extensively, controversies still abound in the photocatalytic orders of the facets. In the present work, we investigated the photocatalytic activity of different facets of anatase TiO 2 treated with different surface treatment methods. The anatase TiO 2 nanocrystals with {001} and {101} facets were synthesized by a hydrothermal method using hydrofluoric acid to control the ratio of different facets. The F − ions were removed by two methods: washing with NaOH aqueous solution or calcination. The photocatalytic activities of facets were characterized by dye degradation and the defects on the facets were investigated by X‐ray photoelectron spectroscopy. Our results showed that different surface treatment methods could reverse the photocatalytic order of different facets. the calcination could enhance the density of oxygen vacancy on {001} facets and result in a photocatalytic order of {001} > {101}. In contrast, washing with NaOH aqueous solution produced inverse order.