Sulfate-modified titanium dioxide-bearing blast furnace slag（STBBFS） photocatalysts were prepared by the high energy ball milling method with（NH4）2SO4 and titanium dioxide-bearing blast furnace slag（TBBFS） as ra...Sulfate-modified titanium dioxide-bearing blast furnace slag（STBBFS） photocatalysts were prepared by the high energy ball milling method with（NH4）2SO4 and titanium dioxide-bearing blast furnace slag（TBBFS） as raw materials.X-ray photoelectron spectroscopy（XPS）,X-ray diffraction（XRD）,scanning electron microscopy（SEM）,thermogravimetric analysis（TGA）,UV-visible diffuse reflectance absorption spectra（UV-Vis）,adsorption experiment and photocatalytic degradation measurement were conducted to characterize the structure,surface status,light absorption capacity,adsorption capacity and photocatalytic activity of the obtained photocatalysts.The adsorption equilibrium was described by the Langmuir isotherm model with a maximum adsorption capacity of 8.25 mg/g of Cr（VI） ions onto the STBBFS photocatalysts.As a result,sulfation of TBBFS improved the photocatalytic activities of STBBFSx photocatalysts.At a low calcination temperature,the photocatalytic activity of STBBFS300 photocatalyst was markedly higher compared with TBBFSx prepared at high calcination temperature,indicating that the photocatalytic activity of STBBFSx photocatalyst was determined by the balanced result between adsorption capacity and perovskite content.展开更多
The feasibility of reducing Cr(VI)from the aqueous solution by sulfuric acid-modified titanium-bearing blast furnace slag(SATBBFS)as a photocatalyst was investigated.The photocatalysts were examined by X-ray diffracti...The feasibility of reducing Cr(VI)from the aqueous solution by sulfuric acid-modified titanium-bearing blast furnace slag(SATBBFS)as a photocatalyst was investigated.The photocatalysts were examined by X-ray diffraction(XRD),UV-vis diffuse reflectance spectra,thermogravimetric analysis(TG)and Fourier transform infrared spectroscopy(FTIR).The photocatalytic activities of the different catalysts were evaluated by the photocatalytic reduction of Cr(VI)under UV-vis light irradiation.The results show that the photocatalytic activities of SATBBFS catalysts are strongly dependent on CaTiO3-to-TiO2 mass ratio,adsorption capacity and surface acidity,and SATBBFS calcined at 400°C shows a higher photocatalytic activity compared with other catalysts.展开更多
为了研究TiO_(2)含量的变化对矿渣棉高温熔体黏度的影响,以CaO–MgO–Al_(2)O_(3)–SiO_(2)–TiO_(2)五元渣系为研究对象,采用内柱体旋转法,系统研究了酸度系数为1.4时矿渣棉高温熔体的黏度变化规律,并结合拉曼光谱分析,探索了熔渣结构...为了研究TiO_(2)含量的变化对矿渣棉高温熔体黏度的影响,以CaO–MgO–Al_(2)O_(3)–SiO_(2)–TiO_(2)五元渣系为研究对象,采用内柱体旋转法,系统研究了酸度系数为1.4时矿渣棉高温熔体的黏度变化规律,并结合拉曼光谱分析,探索了熔渣结构的变化特性。结果表明:当TiO_(2)含量从1%增加至4%时,熔体黏度逐渐降低,黏流活化能由170.45 k J/mol降至158.62 k J/mol。当温度高于1 350℃时,样品黏度均低于1.5 Pa·s,流动性良好。同时,熔体内硅氧四面体结构中的Q^(0)和Q^(1)不断增加,而Q^(2)和Q^(3)逐渐降低,平均桥氧数由1.69降至0.95,熔体结构聚合度减小。Ti–O键不断增多,降低了熔体结构的稳定性。展开更多
基金Project (2007CB613504) supported by the National Basic Research Program of ChinaProject (307009) supported by the Foundation for Key Program of Ministry of Education,China+1 种基金Project (N110423003) supported by the Fundamental Research Funds for the Central Universities,ChinaProject (E2012501012) supported by Natural Science Foundation-Steel and Iron Foundation of Hebei Province,China
文摘Sulfate-modified titanium dioxide-bearing blast furnace slag（STBBFS） photocatalysts were prepared by the high energy ball milling method with（NH4）2SO4 and titanium dioxide-bearing blast furnace slag（TBBFS） as raw materials.X-ray photoelectron spectroscopy（XPS）,X-ray diffraction（XRD）,scanning electron microscopy（SEM）,thermogravimetric analysis（TGA）,UV-visible diffuse reflectance absorption spectra（UV-Vis）,adsorption experiment and photocatalytic degradation measurement were conducted to characterize the structure,surface status,light absorption capacity,adsorption capacity and photocatalytic activity of the obtained photocatalysts.The adsorption equilibrium was described by the Langmuir isotherm model with a maximum adsorption capacity of 8.25 mg/g of Cr（VI） ions onto the STBBFS photocatalysts.As a result,sulfation of TBBFS improved the photocatalytic activities of STBBFSx photocatalysts.At a low calcination temperature,the photocatalytic activity of STBBFS300 photocatalyst was markedly higher compared with TBBFSx prepared at high calcination temperature,indicating that the photocatalytic activity of STBBFSx photocatalyst was determined by the balanced result between adsorption capacity and perovskite content.
基金Project(N090423003)supported by the Basic Scientific Research Costs of Central Colleges of ChinaProject(2007CB613504)supported by the National Basic Research Program of ChinaProject(307009)supported by the Foundation for Key Program of Ministry of Education,China
文摘The feasibility of reducing Cr(VI)from the aqueous solution by sulfuric acid-modified titanium-bearing blast furnace slag(SATBBFS)as a photocatalyst was investigated.The photocatalysts were examined by X-ray diffraction(XRD),UV-vis diffuse reflectance spectra,thermogravimetric analysis(TG)and Fourier transform infrared spectroscopy(FTIR).The photocatalytic activities of the different catalysts were evaluated by the photocatalytic reduction of Cr(VI)under UV-vis light irradiation.The results show that the photocatalytic activities of SATBBFS catalysts are strongly dependent on CaTiO3-to-TiO2 mass ratio,adsorption capacity and surface acidity,and SATBBFS calcined at 400°C shows a higher photocatalytic activity compared with other catalysts.
文摘为了研究TiO_(2)含量的变化对矿渣棉高温熔体黏度的影响,以CaO–MgO–Al_(2)O_(3)–SiO_(2)–TiO_(2)五元渣系为研究对象,采用内柱体旋转法,系统研究了酸度系数为1.4时矿渣棉高温熔体的黏度变化规律,并结合拉曼光谱分析,探索了熔渣结构的变化特性。结果表明:当TiO_(2)含量从1%增加至4%时,熔体黏度逐渐降低,黏流活化能由170.45 k J/mol降至158.62 k J/mol。当温度高于1 350℃时,样品黏度均低于1.5 Pa·s,流动性良好。同时,熔体内硅氧四面体结构中的Q^(0)和Q^(1)不断增加,而Q^(2)和Q^(3)逐渐降低,平均桥氧数由1.69降至0.95,熔体结构聚合度减小。Ti–O键不断增多,降低了熔体结构的稳定性。
