Preparation of well-dispersed Mg-doped LaCoO3 nanocrystals with controllable particle size and high visible-light photocatalytic activity

J Nanosci Nanotechnol. 2010 Aug;10(8):5207-12. doi: 10.1166/jnn.2010.2387.

Abstract

Mg-doped LaCoO3 nanocrystals are prepared by a modified sol-gel method. Excess MgO is used to inhibit the crystal growth and agglomeration during the calcination process. A series of Mg-doped LaCoO3 nanocrystals with average crystallite size varying from 13.4 to 31.6 nm can be obtained by changing the molar ratio of Mg:La from 4:1 to 1:10 in the reaction mixture. The largest BET surface area observed is 64.5 m2/g if the molar ratio of Mg:La is 4:1. The product can be well dispersed in water and a very stable colloid formed without any stabilizer. The photocatalytic performance of Mg-doped LaCoO3 nanocrystals is evaluated by the degradation of Reactive Brilliant Red X-3B solution. The well-dispersed Mg-doped LaCoO3 nanocrystals exhibit high visible-light photocatalytic activity.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Azo Compounds / chemistry
  • Calcium Compounds / chemistry
  • Cobalt / chemistry*
  • Lanthanum / chemistry*
  • Magnesium / chemistry*
  • Metal Nanoparticles / chemistry*
  • Metal Nanoparticles / ultrastructure
  • Microscopy, Electron, Scanning
  • Microscopy, Electron, Transmission
  • Naphthalenesulfonates / chemistry
  • Oxides / chemistry*
  • Particle Size
  • Phase Transition
  • Photochemical Processes
  • Titanium / chemistry
  • X-Ray Diffraction

Substances

  • Azo Compounds
  • Calcium Compounds
  • Naphthalenesulfonates
  • Oxides
  • Reactive brilliant red X-3B
  • perovskite
  • Cobalt
  • Lanthanum
  • Titanium
  • Magnesium
  • cobalt oxide