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以液相还原与St9ber法相结合,真空环境下,以CaCO_3为造孔剂,十六烷基三甲溴化铵(CTAB)作为结构导向剂,正硅酸四乙酯(TEOS)和FeSO4为原料,一步法制备了SiO_2包覆纳米铁复合材料(Fe/SiO_2),并采用扫描电镜(SEM)和X射线衍射(XRD)对Fe/SiO_2的形貌结构进行了分析。使用原子吸收光谱仪(AAS)研究了Fe/SiO_2对于模拟Cr(Ⅵ)溶液的吸附性能。结果表明:制备的复合材料为类球形结构;XRD分析表明在2θ=22°和44°处分别出现了SiO_2和Fe的特征衍射峰。吸附溶液pH=3.0时,合成的包覆型Fe/SiO_2对水体中Cr(Ⅵ)的吸附容量为39.33mg/g,吸附行为符合Langmuir等温吸附方程,吸附过程符合准二级动力学方程。
Liquid phase reduction combined with St9ber method, under vacuum environment, with CaCO_3 pore-forming agent, cetyltrimethylammonium bromide (CTAB) as a structure-oriented agent, TEOS and FeSO4 as raw materials, The SiO 2 -coated Fe-SiO 2 composite was prepared by one-step method. The morphology of Fe / SiO 2 was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The adsorption of Fe / SiO_2 on simulated Cr (Ⅵ) solution was studied by atomic absorption spectroscopy (AAS). The results show that the prepared composite has a spherical-like structure. The XRD results show that the characteristic diffraction peaks of SiO 2 and Fe appear at 2θ = 22 ° and 44 °, respectively. Adsorption capacity of Cr (¢ ö) was 39.33 mg / g, and the adsorption behavior was in accordance with Langmuir isothermal adsorption equation. The adsorption process accorded with quasi-second-order kinetic equation.