Synthesis and Characterization of Gel-Derived, Highly Al-Doped TiO<SUB>2</SUB>(Al<I><SUB>x</SUB></I>Ti<SUB>1–<I>x</I></SUB>O<SUB>2–<I>x</I>/2</SUB>; <I>x</I> = 0.083, 0.154, 0.2) Nanoparticles: Improving the Photocatalytic Activity | Publicación