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. 2022 Nov 23;12(1):20164.
doi: 10.1038/s41598-022-24661-0.

Hydrothermal preparation of high purity TiO2 from industrial metatitanic acid by response surface methodology

Congxue Tian  1   2
Affiliations

Hydrothermal preparation of high purity TiO2 from industrial metatitanic acid by response surface methodology

Congxue Tian. Sci Rep. .

Abstract

The response surface methodology of Box Behnken design was used to investigate the effects of hydrothermal conditions on the high purity TiO2 preparation from industrial metatitanic acid. The method had a good fitting result in the prediction model, and the effects could be calculated from a second-order polynomial equation. The hydrothermal conditions greatly affected the structure and purity for the metatitanic acid and rutile TiO2, influenced the process of nucleation and crystallization, grain growth, polymerization, agglomeration and aggregation, further improved the particle size distribution, structure and surface adsorption capacity of metatitanic acid, reduced the adsorption of impurity ions, and finally improved the purity of TiO2. The variables such as hydrothermal temperature, slurry concentration and hydrothermal time had synergistic effects, and the effects of hydrothermal time were larger than the other two. The verification experiments confirmed that the predicted values could be achieved at 99.99% under the optimal hydrothermal conditions.

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Conflict of interest statement

The author declares no competing interests.

Figures

Figure 1
Figure 1
Effects of hydrothermal conditions on the purity of TiO2 (a) Hydrothermal temperature 140 °C, Hydrothermal time 6 h; (b) Slurry concentration 160 g/L, Hydrothermal time 6 h; (c) Slurry concentration 160 g/L, Hydrothermal temperature 140 °C.
Figure 2
Figure 2
The actual purity values (%) plotted against the predicted values (%) derived from the model of purity of TiO2.
Figure 3
Figure 3
Response surface plots and contour line of effects of interaction between each factor on the purity of TiO2.
Figure 4
Figure 4
XRD patterns for the metatitanic acid samples.
Figure 5
Figure 5
Nitrogen isotherms for the hydrothermal treated metatitanic acid samples.
Figure 6
Figure 6
XRD patterns for the high purity TiO2 samples.
Figure 7
Figure 7
SEM photographs for the high purity TiO2 samples.
See this image and copyright information in PMC

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