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以海藻酸钠(SA)、纤维素纳米纤维(CNF)和聚乙烯亚胺(PEI)为原料,制备了三元复合水凝胶珠SCP@PEI,扫描电镜、红外光谱及X射线光电子能谱的测试结果均表明其已被成功制备。pH值为3时,其对Cr(VI)的吸附效果最佳,这主要与Cr(VI)的赋存形态有关。Freundlich等温吸附模型可较好地拟合其吸附等温线,对Cr(VI)的最大吸附量为6.49mmol/g,热力学参数表明,吸附为自发、吸热、熵增的过程。吸附动力学曲线遵循拟二级动力学模型,6h可达到吸附平衡。主导作用机制包括质子化胺基参与的静电吸附、羟基参与的Cr(VI)还原以及羟基和羧基参与的Cr(III)配位作用。此外,SCP@PEI易于再生,5次循环使用后其对Cr(VI)的吸附量仅下降了4.31%,结果进一步证明其性能稳定,未来应用前景广阔。
Abstract：Using sodium alginate(SA), cellulose nanofibers(CNF) and polyethyleneimine(PEI) as raw materials, the ternary composite hydrogel beads SCP@PEI were prepared. Scanning electron microscopy, infrared spectroscopy and X-ray photoelectron spectroscopy all indicate its successful preparation. When the pH value is 3, the adsorption capacity for Cr(VI) is the best, which is mainly related to the occurrence form of Cr(VI). The Freundlich model can better fit the adsorption isotherm, the maximum adsorption capacity of Cr(VI) is 6.49 mmol/g, thermodynamic parameters indicate that adsorption is a process of spontaneous, endothermic, and entropy increase. The adsorption kinetic curve follows the Pseudo-second-order kinetic model, and equilibrium can be reached within 6 h. The dominant mechanism includes electrostatic adsorption with the participation of protonated amine groups, reduction of Cr(VI) with the participation of hydroxyl groups, and Cr(Ⅲ) coordination with the participation of hydroxyl and carboxyl groups. Moreover, SCP@PEI is easy to regenerate. After five cycles of use, its adsorption capacity for Cr(VI) only drops by 4.31%, which further proves its advanced performance.
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基本信息:
DOI：10.16026/j.cnki.iea.2021020097
中图分类号:X703;TQ424;TQ427.26
引用信息:
[1]冯悦峰,张希,邱易行,等.三元复合水凝胶珠对水中Cr(VI)的高效去除特性与机制[J].离子交换与吸附,2021,37(02):97-112.DOI:10.16026/j.cnki.iea.2021020097.
基金信息:
国家自然科学基金(No.51878334)
2021-04-20
2021-04-20