Effect of Eu3+ concentration on the photocatalytic activity of LaSr2AlO5 powders


C.R García

The photocatalytic activity of LaSr2AlO5:Eu3+ (LSA:Eu) ceramic powders was studied by monitoring the
degradation of methylene blue (MB) dye in water under UV excitation (253 nm). Several LSA:Eu samples were
fabricated with Eu3+ concentrations from 1 to 10 at.%. XRD patterns show a single tetragonal phase for all
LSA:Eu samples. Scanning electron micrographs of the ceramic powders depicted coalesced particles with
average sizes in the range of 3.5–4.27 μm. The optical bandgap of these powders varies between 4.7 eV and
5.1 eV depending on the Eu3+ concentration. The results of photocatalytic activity indicate that MB degradation
rate increases as the Eu content increases. In fact, totalMB degradation is reached after 360min underUV light by
using LSA:Eu (10 at.%) powders, and these can be removed easily after photocatalytic water treatment. Thus,
LSA:Eu powders could be potential photocatalyst for water cleaning applications.

Artículo-CERG 3 2015