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首页> 外文期刊>RSC Advances >Polyethylenimine-functionalized cellulose aerogel beads for efficient dynamic removal of chromium(VI) from aqueous solution
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Polyethylenimine-functionalized cellulose aerogel beads for efficient dynamic removal of chromium(VI) from aqueous solution

机译：聚乙烯亚胺官能化的纤维素气凝胶珠，可有效地动态去除水溶液中的六价铬

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摘要

For the highly effective removal of hexavalent chromium from aqueous solutions, a new polyethylenimine (PEI) grafted porous adsorbent, a cellulose@PEI aerogel (CPA-2) composite, was synthesized through a glutaraldehyde crosslinking reaction between the amine groups of PEI and the hydroxyl groups of cellulose. The physicochemical properties of this new adsorbent were characterized by FT-IR, SEM, EDX, XPS, etc., and the modification of grafting with PEI was demonstrated by FT-IR, EDX and XPS analyses. The effects of pH, contact time, initial concentration and PEI content on Cr(VI) sorption were systematically investigated. Experimental data were well described by the Freundlich isotherm and the pseudo-second-order model in a batch system, demonstrating that chemisorption was the rate-controlling factor for Cr(VI) removal with CPA-2. Furthermore, the experimental maximum adsorption capacity of CPA-2 was 229.1?mg g?1, which was around 12 times higher than that of cellulose aerogel (CA) (18.7 mg g?1). The Thomas model was well fitted to the breakthrough curves of adsorption processes under different fixed-bed conditions. Above all, the exhausted bead-like adsorbent could be easily separated and regenerated without significant loss of adsorption capacity. Accordingly, this new composite material should be a promising sorbent for sewage disposal, with advantages of high performance, low-cost, biodegradability and excellent reusability.
机译：为了从水溶液中高效去除六价铬，通过PEI胺基与羟基之间的戊二醛交联反应，合成了一种新型聚乙烯亚胺（PEI）接枝的多孔吸附剂，即纤维素@PEI气凝胶（CPA-2）复合材料。组纤维素。通过FT-IR，SEM，EDX，XPS，等表征了这种新型吸附剂的理化性质，并通过FT-IR，EDX和XPS分析证明了PEI接枝的改性。系统地研究了pH，接触时间，初始浓度和PEI含量对Cr（ VI ）吸附的影响。批处理系统中的Freundlich等温线和伪二级模型很好地描述了实验数据，证明化学吸附是CPA-2去除Cr（ VI ）的速率控制因素。此外，CPA-2的实验最大吸附容量为229.1？mg g ？1 ，约为纤维素气凝胶（CA）（18.7 mg）的12倍。 g ？1 ）。 Thomas模型很好地拟合了不同固定床条件下吸附过程的突破曲线。最重要的是，用尽的珠状吸附剂可以容易地分离和再生，而不会显着降低吸附能力。因此，这种新的复合材料应该是一种有前途的污水处理吸附剂，它具有高性能，低成本，可生物降解性和出色的可重复使用性的优点。

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