吸附
热重分析
朗缪尔吸附模型
傅里叶变换红外光谱
化学
壳聚糖
核化学
色谱法
化学工程
有机化学
工程类
作者
Yongbo Lan,Xiangmin Lei,Chaoyue Zhao,Huimin Liu,Haochi Liu,Guozhen Fang,Jifeng Liu,Shuo Wang
标识
DOI:10.1016/j.seppur.2023.124386
摘要
Here, we present an effective and environmentally friendly approach for fabricating polypeptide functionalized magnetic chitosan microspheres (Fe3O4@CTS@PS) based on the effective binding of polypeptide (GCTCWCSGE) with mercury ions (Hg (II)). The morphology and component of the prepared Fe3O4@CTS@PS was characterized via scanning electronic microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, and vibrating sample magnetometer. Effects of the polypeptide sequence, pH, adsorption time, initial concentration, temperature on the adsorption performance and anti-interference ability and reusability were studied. The Fe3O4@CTS@PS had excellent adsorption selectivity for Hg (II) and the adsorption capacity can reach to 218.8 mg·g−1 at 318 K and pH5.0. Kinetic data was correlated well with the pseudo-second-order model and adsorption isotherm agreed well with the Langmuir isotherm model. The reusability of Fe3O4@CTS@PS was also investigated and the adsorption capacity of Fe3O4@CTS@PS for Hg(II) still remained 92% of the initial values after four adsorption-elution cycles (eluting agent was Na2S2O3). The prepared Fe3O4@CTS@PS showed excellent adsorption performance for Hg (II) in real samples (lake water, milk and nori) and was a promising adsorbent in practical applications.
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