Flexible core-shell/bead-like alginate@PEI with exceptional adsorption capacity, recycling performance toward batch and column sorption of Cr(VI)

吸附 吸附 吸附剂 傅里叶变换红外光谱 X射线光电子能谱 水溶液 化学工程 试剂 弗伦德利希方程 化学 有孔小珠 聚乙烯亚胺 材料科学 核化学 解吸 色谱法 有机化学 复合材料 工程类 基因 生物化学 转染
作者
Yong‐Zhu Yan,Qingda An,Zuoyi Xiao,Wei Zheng,Shangru Zhai
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:313: 475-486 被引量:328
标识
DOI:10.1016/j.cej.2016.12.099
摘要

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 [email protected] 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 [email protected] 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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