Wan Xin, Liu Ziqian, Xie Lingying, Qu Guo, Zhang Han, Wang Biao, Li Yan, Zhang Yue-Fei, Zhao Shicheng
Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation & Hunan Provincial Key Laboratory of Cytochemistry, School of Chemistry and Chemical Engineering, Changsha University of Science and Technology, Changsha 410114, PR China.
Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation & Hunan Provincial Key Laboratory of Cytochemistry, School of Chemistry and Chemical Engineering, Changsha University of Science and Technology, Changsha 410114, PR China.
Int J Biol Macromol. 2022 Dec 1;222(Pt B):2017-2027. doi: 10.1016/j.ijbiomac.2022.10.001. Epub 2022 Oct 7.
A novel adsorbent acrolein crosslinked polyethylenimine/chitosan hydrogel (A-PEI/CS) was developed with excellent recycling stability and ion-enhanced effect on removing anionic dye (acid blue 93, AB93) from aquatic environment. For AB93, A-PEI/CS was such an adsorbent with the characteristics of high adsorption capacity up to 1212.4 mg/g and continuous recyle ability of more than 15 times. After 15 desorption-regeneration cycles, the removal rate of A-PEI/CS for AB93 could still be as high as 96 % with imperceptibly downward trend. In addition, the addition of salts (KCl, NaCl and CaCl) could promote the adsorption of A-PEI/CS, and the removal rate would be enhanced with increasing concentration of the salt. The effects of pH (2-7), contact time (30-600 min), temperature (30-50 °C) on the adsorption performance of A-PEI/CS were systematically examined. Furthermore, the physicochemical properties of the adsorbent were analyzed by FT-IR, XPS and zeta potential. The adsorption mechanism can be explained by electrostatic interaction, hydrogen bond interaction, chemical interaction. Intriguing to note that, the adsorption energy of adsorbents was investigated by molecular simulation, and the low pH and common salt environment can promote the adsorption effect, indicating that the prepared adsorbent has excellent application value in the treatment of practical high-salinity wastewater.
一种新型吸附剂丙烯醛交联聚乙烯亚胺/壳聚糖水凝胶（A-PEI/CS）被开发出来，它在从水环境中去除阴离子染料（酸性蓝93，AB93）方面具有出色的循环稳定性和离子增强效应。对于AB93，A-PEI/CS是一种吸附剂，具有高达1212.4 mg/g的高吸附容量和超过15次的连续循环能力。经过15次解吸-再生循环后，A-PEI/CS对AB93的去除率仍可高达96%，且呈不易察觉的下降趋势。此外，添加盐（KCl、NaCl和CaCl）可促进A-PEI/CS的吸附，去除率会随着盐浓度的增加而提高。系统研究了pH（2-7）、接触时间（30-600分钟）、温度（30-50°C）对A-PEI/CS吸附性能的影响。此外，通过傅里叶变换红外光谱（FT-IR）、X射线光电子能谱（XPS）和zeta电位分析了吸附剂的物理化学性质。吸附机理可以用静电相互作用、氢键相互作用、化学相互作用来解释。有趣的是，通过分子模拟研究了吸附剂的吸附能，低pH和普通盐环境可促进吸附效果，表明所制备的吸附剂在处理实际高盐废水方面具有优异的应用价值。
