One step hydrothermal synthesis of TiO2 with variable HCl concentration: Detailed characterization and photocatalytic activity in propene oxidation

L. Cano-Casanova, A. Amorós-Pérez, M. Ouzzine, M. A. Lillo-Ródenas, M. C. Román-Martínez

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

TiO2 materials have been prepared by a novel one-step hydrothermal synthesis method at mild conditions (low temperature and time) using titanium tetraisopropoxide as precursor and HCl solutions of different concentration, ranging from 0.5 to 12 M. A detailed physico-chemical characterization has been done, putting especial attention to the quantification of crystallinity and surface OH content. All the obtained samples have high surface areas (100–135 m2/g), small anatase crystal size (8–11 nm) and high crystallinity (around 80%). The concentration of the HCl used in the synthesis has a significant effect on the two first mentioned parameters and on the proportion of crystalline phases (anatase-brookite-rutile) developed. There is a good correlation between the amount of hydroxyl surface groups and the specific surface area (SBET), but regarding surface density of OH groups there are, as well, some differences between samples (the samples with higher OH surface densities are those prepared with less concentrated HCl solutions). Most of the prepared photocatalysts are more active than commercial TiO2-P25 in the gas phase oxidation of propene at low concentration. The best photocatalytic performance is found for samples prepared with 0.5 and 0.8 M HCl, what can be explained by a suitable combination of properties: high surface area and developed porosity, high surface OH groups’ content and density and large proportion of anatase with small crystal size.

Original languageEnglish
Pages (from-to)645-653
Number of pages9
JournalApplied Catalysis B: Environmental
Volume220
DOIs
Publication statusPublished - 2018 Jan 1

Keywords

  • HCl effect
  • Hydrothermal synthesis
  • Photocatalysis
  • Propene oxidation
  • TiO

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

Fingerprint Dive into the research topics of 'One step hydrothermal synthesis of TiO<sub>2</sub> with variable HCl concentration: Detailed characterization and photocatalytic activity in propene oxidation'. Together they form a unique fingerprint.

  • Cite this