Flexible core-shell/bead-like alginate@PEI with exceptional adsorption capacity, recycling performance toward batch and column sorption of Cr(VI)
Flexible core-shell/bead-like alginate@PEI with exceptional adsorption capacity, recycling performance toward batch and column sorption of Cr(VI)
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柔性核壳/珠状海藻酸盐@PEI，具有卓越的吸附能力、对 Cr(VI) 的批量和柱吸附的回收性能
DOI：
10.1016/j.cej.2016.12.099
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发表时间：
2017-04
影响因子：
15.1
通讯作者：
Zhai Shangru
中科院分区：
文献类型：
--
作者：
Yan Yongzhu;An Qingda;Xiao Zuoyi;Zheng Wei;Zhai Shangru
以聚乙烯亚胺（PEI）为改性剂，通过交联反应在海藻酸盐微球表面引入高密度的活性中心，制备了核壳/珠状海藻酸盐@PEI吸附剂，并将其用于水中Cr（VI）的吸附。采用傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、能谱仪（EDS）、X射线光电子能谱仪（XPS）等对该吸附剂进行了表征。吸附过程符合准二级动力学模型和Freundlich等温式。在最佳实验条件下，海藻酸钠对Cr（VI）的最大吸附量为431.6mg/g，远高于海藻酸钠（SA）的吸附量（24.2mg/g）。用连续精馏塔不同实验条件下的穿透曲线成功地拟合了托马斯和Bohart-Adams模型。更重要的是，藻酸盐@PEI的吸附能力在十个吸附-解吸研究循环后仅显示出轻微的损失。与其他已报道的吸附材料相比，该核壳/珠状复合材料具有超高吸附容量、低成本、环境友好和良好的循环利用性能等优点。
A chemically modified alginate beads for heavy metal removal was prepared using polyethylenimine (PEI) as a modification reagent, which high density active sites were introduced favorably onto the surface by cross-linking reaction, leading to the designing of flexible core-shell/bead-like alginate@PEI sorbent and employed for the adsorption of Cr(VI) from aqueous solutions. This new sorbent was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) etc. The results demonstrated that the optimized pH value was observed at 2.0. The adsorption processes fitted well with the pseudo-second-order kinetic model and the Freundlich isotherm in a batch system. The experimental maximum adsorption capacity for Cr(VI) was 431.6 mg/g under an optimal testing condition, which was much higher than that of sodium alginate (SA) (24.2 mg/g). Thomas and Bohart–Adams models were successfully fitted with breakthrough curves obtained under different experimental conditions in a continuous column process. More importantly, the adsorption capacity of the alginate@PEI only showed a slight loss after ten cycles of adsorption-desorption studies. Compared to other reported adsorptive materials, this core-shell/bead-like composite promises advantages of ultra-high adsorption capacity, low-cost, environmental friendliness and excellent recycling performance.
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