吸附
解吸
蒙脱石
X射线光电子能谱
水溶液
化学
弗伦德利希方程
离子交换
铜
动力学
肿胀 的
化学工程
核化学
无机化学
离子
材料科学
有机化学
复合材料
工程类
物理
量子力学
作者
Xiao Feng Sun,Yiwei Hao,Yingyue Cao,Qihang Zeng
标识
DOI:10.1016/j.ijbiomac.2019.01.058
摘要
Superadsorbent hydrogel was prepared from lignin and montmorillonite for Cu(II) ions removal, and the chemical structure and morphology of the hydrogel were characterized by FT-IR, XRD, SEM and XPS. The swelling kinetics of the prepared hydrogel was investigated, and the result showed that the swelling process fit the Schott second-order dynamic equation. The influences of pH, contact time, Na+ concentration, and initial Cu(II) ion concentration on adsorption were studied, and the maximum adsorption value was 1.17 mmol/g, and the adsorption was rapid during the initial 5 h period, and copper ions adsorption on the superadsorbent hydrogel is a favorable process. The results also indicated that the adsorption kinetics was in accordance with the pseudo-second-order kinetic model and the adsorption isotherm conformed to the Freundlich model. FT-IR and XPS analysis revealed that the adsorption behavior was mainly due to ion exchange. The desorption ratios of copper ions from the superadsorbent were >0.8, and the regeneration efficiency was >80% after five cycles reuse, and the results show the excellent desorption performance and reusability of the prepared hydrogel.
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