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Lei X.F.,Northeastern University China | Xue X.X.,Liaoning Key Laboratory of Metallurgical Resource Recycling Science | Yang H.,Liaoning Provincial Universities Key Laboratory of Boron Resource Ecological
Advanced Materials Research | Year: 2014

Iron titanate photocatalysts were synthesized by the high-energy ball milling method with titanium ore as the starting material. X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR), thermal gravity and differential thermal analysis (TG-DTA), UV-visible diffuse reflectance absorption spectra (UV-Vis), photoluminescence emission spectra(PL) and photocatalytic degradation measurement were conducted to characterize the structure, surface status, UV-visible light response and performance of the obtained sample. After low temperature calcination (above 400 °C), the photocatalytic activity of iron titanate catalyst decreased gradually, which was mainly due to the decrease of surface hydroxyls and reactant adsorption capability. © (2014) Trans Tech Publications, Switzerland. Source


Lei X.-F.,Northeastern University China | Xue X.-X.,Liaoning Key Laboratory of Metallurgical Resource Recycling Science | Yang H.,Liaoning Provincial Universities Key Laboratory of Boron Resource Ecological
Advanced Materials Research | Year: 2013

The paper investigates the feasibility to reduce Cr(VI) from the aqueous solution by sulfate-modified titanium-bearing blast furnace slag(STBBFS) prepared with the different preparation method. The different photocatalysts were examined by X-ray diffraction (XRD), UV-vis diffuse reflectance spectra and scanning electronic microscopy (SEM). The photocatalytic activities of the different catalysts were evaluated by the photocatalytic reduction of Cr(VI) under UV-vis light irradiation. For the photocatalytic reduction of Cr(VI), the photocatalytic activities of STBBFS catalysts were found to be strongly dependent of absorbance in UV-visible region, adsorption capacity and surface acidity, and STBBFS prepared by dry-process showed a higher photocatalytic activity compared to that prepared by hydro-chemistry method. © (2013) Trans Tech Publications, Switzerland. Source


Lei X.-F.,Northeastern University China | Xue X.-X.,Northeastern University China | Xue X.-X.,Liaoning Key Laboratory of Metallurgical Resource Recycling Science | Yang H.,Liaoning University of Technology
Gongneng Cailiao/Journal of Functional Materials | Year: 2013

Nitric acid-modified titanium ore (NATO) photocatalysts were prepared by the high energy ball milling method at different temperature. NATO photocatalysts were characterized by XRD, FT-IR, UV-Vis absorption spectra, TG-DTA and PL measurements. Its photocatalytic activity was checked through the photocatalytic oxidation of methyl orange as a model compound under vis light irradiation. The results showed that: mixed crystal structure was found in NATO photocatalysts; the photocatalytic activities of NATO calcined at 400°C showed a higher catalytic activity compared to other catalysts; the higher concentration of nitrate and the visible absorption capacity, and the suitable phase ratio led to the enhancement of the photocatalytic activities of NATO calcined at 400°C; the decoloration rate of methyl orange reached 100% after 1h. Source


Yu H.-H.,Shenyang Ligong University | Yu H.-H.,Northeastern University China | Yu H.-H.,Liaoning Key Laboratory of Metallurgical Resource Recycling Science | Li X.,Shenyang Ligong University | And 2 more authors.
Gongneng Cailiao/Journal of Functional Materials | Year: 2013

Using the iron ore tailings as the silica source and n-hexadecyltrimethyl ammonium bromide (CTAB) as the template, mesoporous molecular sieves MCM-41 was successfully synthesized by hydrothermal synthesis. The sample was characterized by XRD, BET and HRTEM. The effects of adsorption conditions on the adsorption efficiency for Cr6+ by the MCM-41 absorbents were systemically studied. The adsorption isothern model and adsorption kinetics model were also explored. With these parameters increasing, such as the adsorbent time, adsorbent dose, and initial concentration, the efficiencies of Cr6+ were also increased. The adsorption kinetics of MCM-41 absorbents for the Cr6+ was corresponded to the modified pseudo-second-order equations, and the absorption isotherms was all satisfied to the Langmuir models. Source


Lei X.-F.,Northeastern University China | Chen C.,Northeastern University China | Li X.,Northeastern University China | Xue X.-X.,Liaoning Key Laboratory of Metallurgical Resource Recycling Science | Yang H.,Liaoning Provincial Universities Key Laboratory of Boron Resource Ecological
Applied Mechanics and Materials | Year: 2014

In this paper, steel slag as the main raw material, modified steel slag adsorbent was prepared using steel slag and the active carbon as the starting materials. The influences of doping substance, the particle size, calcining temperature and doping ratio on the decoloration rate of methyl orange wastewater were investigated. The results showed that the decoloration rate of methyl orange can reach 93.62% when the doping substance was the activated carbon, the particle size was 120 mesh, the calcining temperature was 700℃, the doping ratio was 1:1. © (2014) Trans Tech Publications, Switzerland. Source

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