Influence of NaOH Concentration on the Crystallization and Phase Development of Titanium Dioxide Derived from Titanium Slag via Hydrothermal Processing

Hoang Trung Ngon; Phan Dinh Tuan; Kieu Do Trung Kien; Tran Anh Khoa; Truong Khanh Vi; Vo Ngoc Tuyet

doi:10.22146/ijc.99564

Influence of NaOH Concentration on the Crystallization and Phase Development of Titanium Dioxide Derived from Titanium Slag via Hydrothermal Processing

https://doi.org/10.22146/ijc.99564

Hoang Trung Ngon^(1*), Phan Dinh Tuan⁽²⁾, Kieu Do Trung Kien⁽³⁾, Tran Anh Khoa⁽⁴⁾, Truong Khanh Vi⁽⁵⁾, Vo Ngoc Tuyet⁽⁶⁾

(1) Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City 70000, Vietnam; Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc City, Ho Chi Minh City 70000, Vietnam
(2) Research Institute for Sustainable Development, Ho Chi Minh City University of Natural Resources and Environment, 236B Le Van Sy Street, Ward 1, Tan Binh District, Ho Chi Minh 70000, Vietnam
(3) Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc City, Ho Chi Minh City 70000, Vietnam; Faculty of Materials Technology, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City 70000, Vietnam
(4) Faculty of Environment, Ho Chi Minh City University of Natural Resources and Environment, 236B Le Van Sy Street, Ward 1, Tan Binh District, Ho Chi Minh 70000, Vietnam
(5) Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City 70000, Vietnam; Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc City, Ho Chi Minh City 70000, Vietnam
(6) Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City 70000, Vietnam; Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc City, Ho Chi Minh City 70000, Vietnam
(*) Corresponding Author

Abstract

The hydrothermal method presents a promising approach for synthesizing high-quality rutile TiO₂ pigments from titanium slag, utilizing controlled NaOH concentrations to modulate crystalline and morphological properties. This study examined the effects of varying NaOH concentrations on the crystallization and phase composition of TiO₂ derived from titanium slag. Mixtures of titanium slag and NaOH underwent hydrothermal treatment at 200 °C for 18 h, and the resulting TiO₂ samples were characterized using X-ray diffraction and scanning electron microscopy to evaluate phase composition and morphology. The results indicated that NaOH concentrations below 600 g/L promoted the formation of well-ordered, highly crystalline TiO₂ with uniform crystal sizes. Conversely, higher NaOH concentrations increased the proportions of rutile and anatase phases, underscoring the significant impact of NaOH concentration on phase development. This study emphasizes the potential of the hydrothermal method in fine-tuning the properties of TiO₂ for optimized pigment applications through adjustments in NaOH concentration.

Keywords

titanium dioxide; rutile phase; titanium slag; hydrothermal synthesis; sodium hydroxide concentration

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DOI: https://doi.org/10.22146/ijc.99564