Publication detail

Biphasic anatase-brookite nanoparticles prepared by sol-gel complex synthesis and their photocatalytic activity in hydrogen production

CIHLÁŘ, J. KAŠPÁREK, V. KRÁLOVÁ, M. ČÁSTKOVÁ, K.

Original Title

Biphasic anatase-brookite nanoparticles prepared by sol-gel complex synthesis and their photocatalytic activity in hydrogen production

Type

journal article in Web of Science

Language

English

Original Abstract

Titanium tetraisopropoxide was used as the precursor in the preparation of TiO2 nanoparticles via sol-gel complex synthesis. The complex-forming (chelate-forming) substances used were glycine, EDTA, acetylacetone, and hydroxycarboxylic acids (lactic acid – LA, citric acid – CA, tartaric acid – TA) and their salts (sodium citrate – CA-Na, ammonium citrate – CA-NH4, lithium lactate – LA-Li). Biphasic anatase-brookite nanoparticles were prepared by hydrothermal and solid-state reactions. The specific surface of the particles ranged from 202 to 292 m2/g. Their composition was studied by means of X-ray diffraction. The nanoparticles were studied using differential scanning calorimetry and thermogravimetric analysis. The widths of band gaps were examined using UV-VIS spectroscopy. The Eg values of biphasic TiO2 were in the range from 3.08 to 3.21 eV. The photocatalytic activity of the samples prepared was tested on hydrogen production. The maximum rate of H2 evolution was catalysed by anatase-brookite nanoparticles with 36 % of brookite, which were prepared using lactic acid. The minimum rate of H2 evolution was observed in the presence of particles of anatase prepared by means of acetylacetone. Cooperative behaviour of the anatase and brookite phases was observed in the nanoparticles, which retarded the recombination of holes and electrons and led to a photocatalytic activity that was higher than the activities of the two separate phases.

Keywords

biphasic anatase-brookite, hydrogen production, hydrogen, sol-gel complex synthesis, chelates

Authors

CIHLÁŘ, J.; KAŠPÁREK, V.; KRÁLOVÁ, M.; ČÁSTKOVÁ, K.

RIV year

2015

Released

23. 2. 2015

Publisher

Elsevier Ltd.

Location

Nizozemí

ISBN

0360-3199

Periodical

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

Year of study

40

Number

7

State

United Kingdom of Great Britain and Northern Ireland

Pages from

2950

Pages to

2962

Pages count

13

URL

http://www.sciencedirect.com/science/article/pii/S0360319915000178

BibTex

@article{BUT113196,
  author="Jaroslav {Cihlář} and Vít {Kašpárek} and Marcela {Králová} and Klára {Částková}",
  title="Biphasic anatase-brookite nanoparticles prepared by sol-gel complex synthesis and their photocatalytic activity in hydrogen production",
  journal="INTERNATIONAL JOURNAL OF HYDROGEN ENERGY",
  year="2015",
  volume="40",
  number="7",
  pages="2950--2962",
  doi="10.1016/j.ijhydene.2015.01.008",
  issn="0360-3199",
  url="http://www.sciencedirect.com/science/article/pii/S0360319915000178"
}