Article: 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 Journal: International Journal of Nanoparticles (IJNP) 2019 Vol.11 No.1 pp.37 - 61 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. Inderscience Publishers - linking academia, business and industry through research

Title: 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

Authors: Amna Bashir; Fatima Bashir; Zahid Mehmood; Muhammad Sultan Satti; Zareen Akhter

Addresses: Department of Chemistry, Quaid-i-Azam University, Islamabad, 45320, Pakistan ' Department of Chemistry, Quaid-i-Azam University, Islamabad, 45320, Pakistan ' Department of Chemistry, Allama Iqbal Open University, Islamabad, 45320, Pakistan ' Nanoscience and Technology Department, National Centre for Physics, Islamabad, 45320, Pakistan ' Nanoscience and Technology Department, National Centre for Physics, Islamabad, 45320, Pakistan

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.

Keywords: catalysis; metal oxides; degradation; chemical oxygen demand; COD; Azo dyes; synergistic effect.

DOI: 10.1504/IJNP.2019.097935

International Journal of Nanoparticles, 2019 Vol.11 No.1, pp.37 - 61

Received: 19 Sep 2018
Accepted: 24 Oct 2018
Published online: 22 Feb 2019 *

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Title: 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

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Title: 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