N-doped TiO2/sepiolite nanocomposites with enhanced visible-light catalysis: Role of N precursors

Feng Zhou, Huaibing Song, Hongquan Wang, Sridhar Komarneni, Chunjie Yan

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24 Scopus citations

Abstract

Several nitrogen-doped TiO2/Sepiolite (N-TiO2/Sep) photocatalysts were prepared via microwave-hydrothermal treatment using four different types of nitrogen sources: ammonium hydroxide, urea, ethylenediamine and triethylamine. The obtained nanocomposites were characterized by using XRD, TEM, BET, XPS and UV–vis techniques. The results revealed that the chemical and morphological properties of the nanocomposites were significantly dependent on the nitrogen source. The interstitial N doping occurred in the form of N-O-Ti-O and the surfaces of the samples were modified by carbon species from dopants. As compared to that of the undoped sample, N-doped samples exhibited a red shift in the band gap transition. The results of simulated solar light photocatalytic activities demonstrated that NTS-EDA exhibited better photocatalytic activity than singly N-doped (i.e., no carbon) or undoped TiO2/Sep sample. The enhanced solar-light activity is attributed to the low band gap energy with N-doping, the high adsorption capacity and uniform distribution of titania nanoparticles with sepiolite as support, and the appropriate carbon content of the dopants.

Original languageEnglish (US)
Pages (from-to)9-17
Number of pages9
JournalApplied Clay Science
Volume166
DOIs
StatePublished - Dec 15 2018

All Science Journal Classification (ASJC) codes

  • Geology
  • Geochemistry and Petrology

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