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Three kinds of Al-TiO 2  samples and pure TiO 2  samples were synthesized via a modified polyacrylamide gel route using different aluminum salts, including Al 2 (SO 4 ) 3 ∙18H 2 O, AlCl 3 , and Al(NO 3 ) 3 ∙9H 2 O under identical conditions. The influence of different aluminum salts on the phase purity, morphologies, thermal stability of anatase and photocatalytic properties of the as-prepared Al-TiO 2  nanoparticles were studied. The energy gap (Eg) of Al-TiO 2  nanoparticles decreases due to Al ion doping into TiO 2 . The photocatalytic activities of the Al-TiO 2  samples were investigated by the degradation of acid orange 7 dye in aqueous solution under simulated solar irradiation. The Al-TiO 2  nanoparticles prepared from Al(NO 3 ) 3 ∙9H 2 O exhibit the best photocatalytic activity among the four kinds of samples, followed in turn by the Al-TiO 2  nanoparticles prepared with AlCl 3 , Al 2 (SO 4 ) 3 ∙18H 2 O and pure TiO 2 . The different performances are attributed to complex effects of Eg, particle size, surface morphology, phase purity and the defect sites of the Al-TiO 2  nanoparticles.

Influence of different aluminum salts on the photocatalytic properties of Al doped TiO2 nanoparticles towards the degradation of AO7 dye