. The pure spinel MgAl2O4
NPs with average crystallite size 27.7, 14.6 and 15.65 nm was
obtained at 800 _C. The produced MgAl2O4 NPs showed photocatalytic
activity by degradation of 90.0% or 95.45% of the Reactive Red
Me 4BL dye under UV or sunlight irradiation, respectively, within
ca. 5 h. This degradation process followed pseudo first order law
with rate constants of 5.85 _ 10_3 and 8.38 _ 10_3 min_1 for the
aforementioned light respectively.