中文摘要：

由高能低温煅烧制备了硫酸盐修饰的含钛高炉渣（sulfate-modified titanium-bearing blast furnace slag,STBBFS）吸附剂。用X射线光电子能谱（X-ray photoelectron spectroscopy,XPS）、Fourier转换红外光谱（Fourier transform infrared spectroscopy,FTIR）、X射线衍射和扫描电镜对吸附剂的成分、物相以及表面结构进行了表征。研究了STBBFS的初始质量浓度、溶液pH值、温度对溶液中Cr（Ⅵ）吸附过程的影响。结果表明：Cr（Ⅵ）在STBBFS吸附剂表面上的吸附遵循Langmuir吸附等温线模型;最大吸附容量在pH=1.5时最大,为8.25mg/g。不同吸附温度和初始浓度下,Cr（Ⅵ）的吸附过程都遵循二级吸附动力学模型。通过计算Cr（Ⅵ）吸附过程中的热力学参数：焓变化ΔH°、自由能变化ΔG°、熵变化ΔS°,得出Cr（Ⅵ）吸附至STBBFS吸附剂表面具有自发性,且升高温度易于Cr（Ⅵ）的吸附。根据XPS和FTIR分析结果,可以认为Cr（Ⅵ）先吸附至吸附剂表面,然后被还原为Cr（Ⅲ）。

英文摘要：

The paper reports on the feasibility of removing Cr（Ⅵ） from aqueous solution using a sulfate-modified titanium-beating blast furnace slag （STBBFS） as an adsorbent. The components and microstructures of the calcined STBBFS adsorbent were examined by X-ray photoelectron spectroscopy （XPS）, Fourier transform infrared spectroscopy .（FTIR）, X-ray diffraction and scanning electronic microscopy. The adsorption efficiency for Cr（Ⅵ） by the STBBFS adsorbents was investigated at different pH values, initial mass concentrations of STBBFS and adsorption temperatures of aqueous solution. The adsorption data followed the Langmuir model rather than the Freundlich model, and 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 adsorbents at pH=1.5. A pseudo-second-order kinetic model showed good fitting to the experimental results at different initial concentrations and adsorption temperatures. The thermodynamic parameters, such as enthalpy change （△Ho）, flee energy change （△Go） and entropy change （△So） were analyzed. The thermodynamics of Cr（Ⅵ） ions onto the STBBFS adsorbents indicates the spontaneous and endothermic nature of the adsorption process. XPS and FTIR analysis show that in the process the of Cr（Ⅵ） is reduced to Cr（Ⅲ） after the adsorption of Cr（Ⅵ）.