Synthesis and Characterization of TiO₂ Nanoparticles by the Method Pechini

Abstract

In recent years, scientific research showed an increasing interest in the field of nanotechnology, resulting in several techniques for the production of nanoparticles, such as methods of chemical synthesis. Among the various existing methods, the Pechini method has been used to obtain nanoparticles of titanium dioxide (TiO2). Thus, this work aims to synthesize and characterize nanoparticles of TiO2 obtained by this method. The technique constitutes in the reaction between citric acid with titanium isopropoxide, resulting as the product the titanium citrate. With the addition of the ethylene glycol polymerization occurs, resulting in a polymeric resin. At the end of the process, the resin is calcined to remove organic matter, creating nanoparticles of TiO2. The resulting powders were characterized by thermogravimetric analysis (TGA) and thermal differential analysis (DTA), X-ray diffraction, absorption spectrophotometry in the infrared, method of adsorption nitrogen / helium (BET method) and scanning electron microscopy. The results obtained in the characterization techniques showed that the Pechini method is promising in obtaining nanosized TiO2.

Photo and Chemical Reduction of Copper onto Anatase‐Type TiO2 Nanoparticles with Enhanced Surface Hydroxyl Groups as Efficient Visible Light Photocatalysts

“…The weight loss at temperature ranging from 180 to 600°C corresponded to condensation of the surface hydroxyl groups , which are about 0.7% and 1.5% for pure TiO 2 and NaOH‐modified TiO 2 nanoparticles, respectively. The weight loss at temperature between 25°C and 180°C, corresponding to the loss of adsorbed water on the surface of the catalysts . The obtained results from TGA analysis suggest that the NaOH‐modified TiO 2 nanoparticles contain more hydroxyl groups on the surface than the pure TiO 2 nanoparticles.…”

Avaliação da fotoluminescência do TiO 2 sintetizado pelo método Pechini

“…Outro parâmetro que pode influenciar o valor de band gap é a temperatura de síntese, pois esta causa transformação de fase anatásio para rutilo mesmo para concentração de ácido cítrico:cátions metálicos constante. Esse comportamento foi reportado em [27], quando foi sintetizado TiO 2 pelo método Pechini na proporção entre ácido cítrico e cátion metálico de 3:1, variando apenas a temperatura de calcinação com valores de 400 e 900 ºC; foi reportado redução no valor da banda proibida de 3,09 para 2,92 eV, ou seja, o aumento da concentração de fase rutilo em detrimento à fase anatásio aumentou a energia da banda proibida. Os espectros de emissão do TiO 2 obtidos mediante a excitação a 440 nm estão ilustrados na Fig.…”

TiO2 Synthesis by the Pechini’s Method and Application for Diclofenac Photodegradation†

“…It is known that at the beginning of the photocatalytic reaction, the concentration of NaDF is higher; however, this catalyst is able with greater capacity to reduce the NaDF concentration. In this case, it is possible that your superficial area has an important role, as well as consequently, it can enable more ways to improve photocatalytic performance, such as, crystalline structure, interactions with organic matter and generation yield of oxidizing species (69,70). In case, the second study time range (10 -60 min) the TiO 2 Evonik ® , which had the lowest performance among the others, achieved similar degradation performance (%), but in need of all up to 60 minutes.…”