Synthesis, characterisation and investigation of enhanced photocatalytic activity of Sm⁺³, Ni⁺² co-doped TiO₂ nanoparticles on the degradation of azo dyes in visible region
by Amna Bashir; Fatima Bashir; Zahid Mehmood; Muhammad Sultan Satti; Zareen Akhter
International Journal of Nanoparticles (IJNP), Vol. 11, No. 1, 2019

Abstract: Pure and samarium-nickel co-doped TiO₂ nanoparticles with different Sm contents were synthesised by sol-gel method. The synthesised nanoparticles were characterised using different techniques. It is revealed from experimental results that the doping of TiO₂ with samarium and nickel not only increase the surface area of mesoporous TiO₂ but also decrease the particle size (17.0 nm to 8.01 nm by increasing Sm⁺³ contents). Diffuse-reflectance spectroscopic studies showed the slight red shift in band-gap transitions and appearance of the new absorption band in the visible region (719 nm) caused by Ni⁺² and Sm⁺³ doping. The photocatalytic degradation of azo dyes (Reactive Red-195 and Reactive Black-08) was carried out in visible region using modified TiO₂ at different pH values. Results revealed that 99% of RR-195 and 75.33% RB-08 were degraded after 10-20 minutes of irradiation. Maximum degradation was achieved in case of nanoparticles co-doped with 5% Ni and 3% Sm.

Online publication date: Fri, 22-Feb-2019

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