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TiO_2 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 p H of the HCl solution,liquid to solid ratio(RL/S,HCl solution to the residue ratio,m L/g) and acidolysis time on the micro-morphology and crystalline phase of as-prepared TiO_2 photocatalysts were systematically investigated.The results indicated that with decreasing p H in the HCl solution and increasing RL/S,the crystalline phase and micro-morphology of the obtained TiO_2 nanostructures tended to transform from anatase type TiO_2 with spherical nanoparticle structures to rutile type TiO_2 with needle-like nanorod structures.The acidolysis time had little influence on the crystalline phase but great impact on the size of the obtained TiO_2.The growth mechanism of TiO_2 from Ti-bearing EAF slag during the acidolysis process was also discussed.In addition,the influence of RL/Son the photocatalytic properties of the synthesized nanostructured TiO_2 was studied.The results showed that the photodegradation efficiency for Rhodamine B solution could reach 91.00% in 120 min when the RL/Swas controlled at 50:1.
TiO 2 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 p H of the HCl solution, liquid to solid ratio (RL / S, HCl solution to the residue ratio, m L / g) and acidolysis time on the micro-morphology and crystalline phase of as-prepared TiO 2 photocatalysts were systematically investigated. The results indicated that with decreasing p H in the HCl solution and increasing RL / S, the crystalline phase and micro-morphology of the obtained TiO 2 nanostructures tended to transform from anatase type TiO_2 with spherical nanoparticle structures to rutile type TiO_2 with needle-like nanorod structures. The acidolysis time had little influence on the crystalline phase but great impact on the size of the obtained TiO 2. the growth mechanism of TiO 2 from Ti-bearing EAF slag during the acidolysis process was also discussed. In addition, the influence of RL / Son the photocatalytic properties of the synthesized nanostructured TiO 2 was studied. The results showed that the photodegradation efficiency for Rhodamine B solution could reach 91.00% in 120 min when the RL / Swas controlled at 50: 1.