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以Fe-Al-Mn三金属纳米复合氧化物作为吸附材料研究了去除模拟地下水中氟离子的吸附特性。根据X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线电子能谱(XPS)、比表面积、孔径和红外光谱(FT-IR)等表征结果,探讨了Fe-Al-Mn三金属纳米复合氧化物吸附剂表面形貌、组成和吸附机理,考察了不同p H值和不同温度下对F-去除效果的影响。实验结果表明,Fe-Al-Mn三金属纳米复合氧化物吸附剂对F-吸附的动力学和热力学实验结果分别与准二级动力学模型及Langmuir等温吸附模型相吻合;其吸附速率都随着温度的升高而增加,由Langmuir等温吸附模型拟合得到最大吸附容量从20.54mg/g(293K)增加到28.53mg/g(313K)。根据标准吉布斯自由能变ΔG0<0、标准反应焓变ΔH0>0判断,Fe-Al-Mn三金属纳米复合氧化物吸附剂对F-的吸附为自发的吸热过程。
The adsorption characteristics of fluoride ions in simulated groundwater were studied by using Fe-Al-Mn trimetallic nanocomposite as adsorbent. According to the characterization results of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), specific surface area, pore size and infrared spectrum (FT-IR) The surface morphology, composition and adsorption mechanism of Fe-Al-Mn trimetallic nanocomposite oxide adsorbents were investigated. The effects of different pH value and temperature on F-removal efficiency were investigated. The experimental results show that the kinetic and thermodynamic experimental results of Fe-Al-Mn trimetallic nanocomposite oxide adsorbents are in agreement with quasi-second-order kinetic model and Langmuir isotherm model, respectively. The adsorption rate of The maximum adsorption capacity increased from 20.54mg / g (293K) to 28.53mg / g (313K) by Langmuir isotherm model fitting. According to the standard Gibbs free energy change ΔG0 <0, the standard reaction enthalpy change ΔH0> 0 judged Fe-Al-Mn trimetallic nanocomposite oxide adsorbent for F- spontaneous endothermic process.