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首页> 外文期刊>Colloid and polymer science >Investigation of removal of Pb(II) and Hg(II) by a novel cross-linked chitosan-poly(aspartic acid) chelating resin containing disulfide bond
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Investigation of removal of Pb(II) and Hg(II) by a novel cross-linked chitosan-poly(aspartic acid) chelating resin containing disulfide bond

机译:用新型的含二硫键的交联壳聚糖-聚天冬氨酸螯合树脂去除Pb(II)和Hg(II)的研究

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摘要

A novel cross-linked chitosan-poly(aspartic acid) chelating resin was synthesized by combining chitosan and poly(aspartic acid) derivative with crosslinker. The structure and morphology of the resin containing disulfide bonds were characterized by ~1H NMR, FT-IR, Raman spectra, and SEM. Adsorption of Pb(II) and Hg(II) from aqueous solution by the resulted chelating resin was investigated in batch techniques. The result of the Raman spectra suggests that the disulfide bonds in the resin also play an important role in the adsorption of Pb(Ii) and Hg(II). The kinetic data were fitted to pseudo-first-order, pseudo-second-order, and intraparticle diffusion models, which is suggestive of following closely the pseudo-second-order kinetic model. Equilibrium data were fitted to Langmuir, Freundlich, and D-R isotherm models. The results of equilibrium isotherm reveal that the empirical Langmuir equation provides an accurate description of the experimental data under the studied concentration range, In addition, thermodynamic and regeneration properties of the adsorbent were also studied.
机译:通过将壳聚糖和聚天冬氨酸衍生物与交联剂结合,合成了一种新型的交联壳聚糖-聚天冬氨酸螯合树脂。用〜1H NMR,FT-IR,拉曼光谱和SEM表征了含有二硫键的树脂的结构和形态。以分批技术研究了所得螯合树脂对水溶液中Pb(II)和Hg(II)的吸附。拉曼光谱的结果表明,树脂中的二硫键在Pb(Ii)和Hg(II)的吸附中也起着重要作用。将动力学数据拟合到伪一阶,伪二阶和粒子内扩散模型,这表明密切遵循伪二阶动力学模型。平衡数据适用于Langmuir,Freundlich和D-R等温线模型。平衡等温线的结果表明,经验Langmuir方程为所研究浓度范围内的实验数据提供了准确的描述,此外,还研究了吸附剂的热力学和再生特性。

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