Fe-NCM复合材料的制备及其对水中Cr(VI)的吸附性能研究

Preparation of Fe-NCM Composite and Adsorption Properties for Cr(VI) in Water

随着工业化的发展,水体中的重金属污染问题日益严重,使得国内外对其关注越来越多。铬污染在重金属污染行列中尤为突出,如何更好地处理Cr污染问题迫在眉睫。我们采用多孔疏松的结构和特殊的磁化特性的磁性碳材料去除水中重金属离子,将水体中的Cr(VI)还原成无害的Cr(III)。本论文采用水热法制备Fe-NCM复合材料,利用扫描电子显微镜(SEM)、X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)分析Fe-NCM的结构特征。吸附实验表明:初始pH值为2.0、吸附时间为360 min,Fe-NCM复合材料对Cr(VI)的吸附容量可达49.05 mg∙g−1,具有较好的去除Cr(VI)效果,同时吸附等温线数据符合Langmuir模型且动力学模型符合拟二级动力学模型,说明该吸附剂的吸附机制是单分子层的化学吸附。

With the development of industrialization, the problem of heavy metal pollution in water is becom-ing more and more serious, which makes more and more attention at home and abroad. Chromium pollution is particularly prominent in the ranks of heavy metal pollution. How to better deal with Cr pollution is imminent. We use magnetic carbon materials with porous loose structure and special magnetization characteristics to remove heavy metal ions in water, and change Cr(VI) in water into harmless Cr(III). In this paper, Fe-NCM composites were prepared by hydrothermal method. The properties of Fe-NCM composites were characterized by field emission scanning electron microscopy (SEM), X-ray diffraction (XRD) and fourier transform infrared spectroscopy (FTIR). The results showed that the initial pH value was 2.0 and under 360 min, the maximum adsorption capacity of Fe-NCM composite material for Cr(VI) was 49.05 mg∙g−1, which indicated that Fe-NCM composite material had a good removal effect on Cr(VI). The adsorption isotherm data accorded with Langmuir model and the kinetic model accorded with pseudo-second-order model, which indicated that the adsorption mechanism of the adsorbent was monomolecular chemical adsorption.