Articles
  • Effect of the concentration NaOH solution on the ability to synthesize TiO2 from titanium slag

  • Hoang Trung Ngona,c,*, Phan Dinh Tuand, Nguyen Tuan Anha,c and Kieu Do Trung Kienb,c,*

  • aFaculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet street, District 10, Ho Chi Minh City, Vietnam
    bFaculty of Materials Technology, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet street, District 10, Ho Chi Minh City, Vietnam
    cVietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, Vietnam
    dResearch Institute for Sustainable Development, Hochiminh City University of Natural Resources and Environment, 236B Le Van Sy Street, Ward 1, Tan Binh District, Ho Chi Minh, Vietnam

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Titanium slag is a waste product from the Ilmanite ore beneficiation process. In this study, titanium slag was used to synthesize TiO2 by hydrothermal method at different NaOH concentrations. Titanium slag was mixed with NaOH solution with different concentrations and hydrothermally treated under 1MPa pressure at 180 oC for 7 hours. The alkalization ability of TiO2 slag by NaOH solution under hydrothermal conditions was evaluated by X-ray diffraction analysis. The hydrothermal solution is hydrolyzed at 90 oC and calcined at 400 oC to form TiO2. After precipitation and calcination, the TiO2 powder was evaluated for phase composition and microstructure using X-ray diffraction analysis and Scanning electron microscopy/ Energy Dispersive X-ray. The results show that the TiO2 separation rate is high when the NaOH concentration reaches over 10 M. A NaOH concentration of 10 M is suitable to separate TiO2 from titanium slag. At this concentration, a large amount of TiO2 was separated, and the solution had little impurities. The low amount of impurities would help TiO2 to be obtained after calcination with high purity, improving the applicability of this material. The TiO2 obtained after calcination has the main polymorphy form anatase. The anatase polymorphy can help the formed TiO2 photocatalytic materials with antibacterial properties.


Keywords: TiO2, anatase, TiO2 slag, Hydrothermal, Alkaline solution.

This Article

  • 2024; 25(3): 375-383

    Published on Jun 30, 2024

  • 10.36410/jcpr.2024.25.3.375
  • Received on Feb 29, 2024
  • Revised on Apr 15, 2024
  • Accepted on Apr 23, 2024

Correspondence to

  • Hoang Trung Ngona,c, Kieu Do Trung Kienb,c,*

  • aFaculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet street, District 10, Ho Chi Minh City, Vietnam
    bFaculty of Materials Technology, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet street, District 10, Ho Chi Minh City, Vietnam
    cVietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, Vietnam
    Tel : (84.8) 8 661 320 Fax: (84.8) 8 661 843 E-mail: htngon@hcmut.edu.vn, kieudotrungkien@hcmut.edu.vn

  • E-mail: htngon@hcmut.edu.vn, kieudotrungkien@hcmut.edu.vn