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Nanomaterials 2019, 9(3), 400; https://doi.org/10.3390/nano9030400

Effective La-Na Co-Doped TiO2 Nano-Particles for Dye Adsorption: Synthesis, Characterization and Study on Adsorption Kinetics

Special Centre for Nano Sciences, Jawaharlal Nehru University, New Delhi 110067, India
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Received: 20 October 2018 / Revised: 30 November 2018 / Accepted: 13 December 2018 / Published: 9 March 2019
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Abstract

The mesoporous La-Na co-doped TiO2 nanoparticles (NPs) have been synthesized by non-aqueous, solvent-controlled, sol-gel route. The substitutional doping of large sized Na+1 and La+3 at Ti4+ is confirmed by X-ray diffraction (XRD) and further supported by Transmission Electron Microscopy (TEM) and X-ray Photo-electron Spectroscopy (XPS). The consequent increase in adsorbed hydroxyl groups at surface of La-Na co-doped TiO2 results in decrease in pHIEP, which makes nanoparticle surface more prone to cationic methylene blue (MB) dye adsorption. The MB dye removal was examined by different metal doping, pH, contact time, NPs dose, initial dye concentration and temperature. Maximum dye removal percentage was achieved at pH 7.0. The kinetic analysis suggests adsorption dynamics is best described by pseudo second-order kinetic model. Langmuir adsorption isotherm studies revealed endothermic monolayer adsorption of Methylene Blue dye. View Full-Text
Keywords: La-Na co-doped TiO2; non-aqueous solvent controlled sol-gel route; physical adsorption; methylene; blue La-Na co-doped TiO2; non-aqueous solvent controlled sol-gel route; physical adsorption; methylene; blue
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Singh, I.; Birajdar, B. Effective La-Na Co-Doped TiO2 Nano-Particles for Dye Adsorption: Synthesis, Characterization and Study on Adsorption Kinetics. Nanomaterials 2019, 9, 400.

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