Cationized Lignin Loaded Alginate Beads for Efficient Cr(VI) Removal

Q2 Engineering Journal of the Korean wood science and technology Pub Date : 2023-09-01 DOI:10.5658/wood.2023.51.5.321

Jungkyu KIM, YunJin KIM, Seungoh JUNG, Heecheol YUN, Hwanmyeong YEO, In-Gyu CHOI, Hyo Won KWAK

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Abstract

In this study, lignin, a lignocellulosic biomass, was chemically modified to produce polyethyleneimine-grafted lignin (PKL) with maximum hexavalent chromium [Cr(VI)] adsorption capacity. Changes in the physicochemical properties due to the cationization of lignin were confirmed through elemental analysis, Fourier transform infrared spectroscopy, and moisture stability evaluation. Alginate (Alg) beads containing PKL (Alg/PKL) were prepared by incorporating cationic lignin into the Alg matrix to apply the prepared PKL in a batch-type water treatment process. The optimal Alg/lignin mixing ratio was selected to increase the Cr(VI) adsorption capacity and minimize lignin elution from the aqueous system. The selected Alg/PKL beads exhibited an excellent Cr(VI) removal capacity of 478.98 mg/g. Isothermal adsorption and thermodynamic analysis revealed that the Cr(VI) removal behavior of the Alg/PKL beads was similar to that of heterogeneous chemical adsorption. In addition, the bulk adsorbent material in the form of beads exhibited adsorption behavior in three stages: surface adsorption, diffusion, and equilibrium.

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阳离子木质素负载海藻酸盐珠高效去除Cr(VI)

在本研究中，对木质纤维素生物质木质素进行化学改性，制备了具有最大六价铬吸附能力的聚乙烯亚胺接枝木质素(PKL)。通过元素分析、傅里叶变换红外光谱和水分稳定性评价，证实了木质素阳离子化引起的理化性质变化。将阳离子木质素掺入到Alg基质中，制备了含有PKL的藻酸盐(Alg/PKL)微球，并将所制备的PKL应用于间歇式水处理工艺。选择最佳的Alg/木质素混合比例，以提高Cr(VI)的吸附能力，并最大限度地减少木质素从水系统中洗脱。所选择的Alg/PKL珠对Cr(VI)的去除率为478.98 mg/g。等温吸附和热力学分析表明，Alg/PKL微球的Cr(VI)去除行为与非均相化学吸附相似。此外，颗粒状吸附材料表现出三个阶段的吸附行为:表面吸附、扩散和平衡。

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来源期刊

Journal of the Korean wood science and technology Materials Science-Materials Science (miscellaneous)

CiteScore

5.20

自引率

0.00%

发文量

期刊介绍： The Journal of the Korean Wood Science and Technology (JKWST) launched in 1973 as an official publication of the Korean Society of Wood Science and Technology has been served as a core of knowledges on wood science and technology. The Journal acts as a medium for the exchange of research in the area of science and technology related to wood, and publishes results on the biology, chemistry, physics and technology of wood and wood-based products. Research results about applied sciences of wood-based materials are also welcome. The Journal is published bimonthly, and printing six issues per year. Supplemental or special issues are published occasionally. The abbreviated and official title of the journal is ''J. Korean Wood Sci. Technol.''. All submitted manuscripts written in Korean or English are peer-reviewed by more than two reviewers. The title, abstract, acknowledgement, references, and captions of figures and tables should be provided in English for all submitted manuscripts.