Fe@Fe3C-C的制备及对双酚A的高效吸附

Preparation of Fe@Fe3C-C and Its Efficient Adsorption of Bisphenol A

该研究制备了铁基金属有机骨架MIL-88B(Fe)衍生磁性多孔碳材料Fe@Fe_(3)C-C,并将其用于水中双酚A(BPA)的高效吸附。采用X射线衍射、扫描电镜和比表面积及孔径分析等手段对材料的晶体结构、形貌和比表面积进行表征。结果表明,在高温作用下,MIL-88B(Fe)转化成Fe、Fe_(3)C共掺杂碳材料(Fe@Fe_(3)C-C)。Fe@Fe_(3)C-C呈具有层次的炸裂状薄片结构且表面较为粗糙,比表面积为280.48 m^(2)/g,与MIL-88B(Fe)相比增加了17倍。吸附实验表明,与MIL-88B(Fe)相比,高温煅烧(≥600℃)可以明显提升吸附性能。0.5 g/L的Fe@Fe_(3)C-C在10 min内对10 mg/L的BPA去除率高达95%。材料具有较广的pH值适用范围(pH 2.0~10.0)和较强的抗无机盐离子(100 mmol/L)干扰能力,并能够用于高盐环境下的BPA吸附。拟二级动力学模型符合BPA在Fe@Fe_(3)C-C上的吸附动力学曲线,吸附过程符合Langmuir模型。循环实验表明,Fe@Fe_(3)C-C易于从水体中回收,且具有良好的可再生性能。上述研究结果表明Fe@Fe_(3)C-C对水中BPA的去除具有较大的潜力。通过X射线光电子能谱、Zeta电位等表征探究吸附机理,结果显示Fe@Fe_(3)C-C的主要作用机制为微孔填充、静电作用及π-π作用。

A magnetic porous carbon material Fe@Fe_(3)C-C was prepared by derivatizing an iron-based metal organic framework MIL-88B(Fe)in this paper,and applied to the efficient adsorption of bi⁃sphenol A(BPA)in water.The crystal structure,morphology and surface area of the material were characterized by X-ray diffraction,scanning electron microscopy,surface area and pore size analysis.The results showed that MIL-88B(Fe)was transformed into Fe and Fe_(3)C co-doped carbon material(Fe@Fe_(3)C-C)under high temperature,which had a layered burst-like sheet structure with rough sur⁃face.The specific surface area of Fe@Fe_(3)C-C was 280.48 m^(2)/g,17 times higher than that of MIL-88B(Fe).The adsorption experiment showed that,compared with MIL-88B(Fe),calcination at high temperature(≥600℃)could improve the adsorption performance significantly.The removal rate of BPA of 10 mg/L reached 95%within 10 min when the amount of Fe@Fe_(3)C-C was 0.5 g/L.The ma⁃terial had a wide range of pH application(pH 2.0-10.0)and a strong ability against ionic interference(100 mmol/L),and was suitable for BPA adsorption in high-salt environment.The pseudo-second-or⁃der kinetic model accords with the adsorption kinetics curve for BPA on Fe@Fe_(3)C-C,and the adsorp⁃tion process accords with the Langmuir model.Cyclic experiments showed that Fe@Fe_(3)C-C has a good recycling ability and could be easily recovered from water.X-ray photoelectron spectroscopy and zeta potential were used to investigate the adsorption mechanism.The main mechanisms of Fe@Fe_(3)CC wereπ-πinteraction,charge interaction and micropore filling.These results indicated that Fe@Fe_(3)C-C has a great application potential in the removal of BPA in water.