Synthesis of TiO2 visible light catalysts with controllable crystalline phase and morphology from Ti-bearing electric arc furnace molten slag.
TiO2 visible light catalysts with different crystalline phases and morphologies were synthesized from titanium-bearing electric arc furnace molten slag (Ti-bearing EAF slag) by using a simple acidolysis process. The effects of the pH of the HCl solution, liquid to solid ratio (RL/S, HCl solution to the residue ratio, mL/g) and acidolysis time on the micro-morphology and crystalline phase of as-prepared TiO2 photocatalysts were systematically investigated. The results indicated that with decreasing pH in the HCl solution and increasing RL/S, the crystalline phase and micro-morphology of the obtained TiO2 nanostructures tended to transform from anatase type TiO2 with spherical nanoparticle structures to rutile type TiO2 with needle-like nanorod structures. The acidolysis time had little influence on the crystalline phase but great impact on the size of the obtained TiO2. The growth mechanism of TiO2 from Ti-bearing EAF slag during the acidolysis process was also discussed. In addition, the influence of RL/S on the photocatalytic properties of the synthesized nanostructured TiO2 was studied. The results showed that the photodegradation efficiency for Rhodamine B solution could reach 91.00% in 120min when the RL/S was controlled at 50:1.
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; The State Key Laboratory for Refractories and Metallurgy, School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China.
Yang
Y
Li
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Lulu
L
Liu
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China. Electronic address: guomin@ustb.edu.cn.
Min
M
Guo
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Mei
M
Zhang
D007220:Industrial Waste; D008669:Metallurgy; D008956:Models, Chemical; D049329:Nanostructures; D014025:Titanium
D007220:Industrial Waste; C009495:titanium dioxide; D014025:Titanium
Crystalline phase; Morphology; Ti-bearing electric arc furnace molten slag; TiO(2)