Abstract
Highly water-dispersible and very small TiO 2 nanoparticles (~3 nm anatase) with large specific surface area have been synthesized by hydrolysis and hydrothermal reactions of titanium butoxide and used for the removal of three azo dyes (Congo red, orange II, and methyl orange) with different molecular structure from simulated wastewaters. The synthesized TiO 2 nanoparticles are well dispersed in water with large specific surface area up to 417 m 2 g −1 . Adsorption experiments demonstrated that the water-dispersible TiO 2 nanoparticles possess excellent adsorption capacities for Congo red, orange II, and methyl orange, which could be attributed to their good water-dispersibility and large specific surface area.
Highlights
Owing to their excellent physical and chemical properties, titanium dioxide (TiO2) nanoparticles (NPs ) have shown great potential in various applications such as photocatalysts, pigments, solar cells, water photolysis for hydrogen production, ultraviolet blockers and adsorbents [1,2,3,4,5]
We report the synthesis of water-dispersible TiO2 NPs with a large specific surface area using a combination of hydrolysis and hydrothermal reactions of titanium butoxide (TBOT)
TiO2 NPs were synthesized by a combination of hydrolysis and hydrothermal reactions of TBOT. 3.0 mL of TBOT was mixed with 5.0 mL of ethanol and certain amount (1.09.0 mL) of 2.0 M HNO3 to form a transparent solution
Summary
Owing to their excellent physical and chemical properties, titanium dioxide (TiO2) nanoparticles (NPs ) have shown great potential in various applications such as photocatalysts, pigments, solar cells, water photolysis for hydrogen production, ultraviolet blockers and adsorbents [1,2,3,4,5]. As-obtained precipitate is not able to be re-dispersed in water to form stable colloidal solution For this reason, in recent years, some modified sol-gel methods have been developed, and it has been demonstrated that water-dispersible TiO2 NPs can be prepared via controlling particle size and preventing particle agglomeration [7].ǂǂǂ. We report the synthesis of water-dispersible TiO2 NPs with a large specific surface area using a combination of hydrolysis and hydrothermal reactions of titanium butoxide (TBOT). This method is initiated by the hydrolysis of TBOT in the presence of excess water and moderate amount of nitric acid. For the first time, we report the enhanced adsorption of Congo red (CR), orange II (O II), and methyl orange (MO) on the synthesized TiO2 NPs
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