8-Hydroxyquinoline esterified-demethylation of low-molecular-weight lignin for the removal of Cr(VI) ion from wastewater

文献类型： 外文期刊

第一作者： Chen, Xiaohong

作者： Chen, Xiaohong;Lin, Wenze;Zou, Jiajie;Wang, Yumeng;Guo, Daliang;Zhao, Huifang;Sha, Lizheng;Chen, Xiaohong;Zheng, Qian;Wang, Ao;Wang, Yumeng;Dong, Yanyan

作者机构：

关键词： Lignin; Esterification; Demethylation; Hexavalent chromium adsorption

期刊名称：SEPARATION AND PURIFICATION TECHNOLOGY （ 影响因子：9.0； 五年影响因子：8.5 ）

ISSN： 1383-5866

年卷期： 2025 年 372 卷

页码：

收录情况： SCI

摘要： Lignin-based adsorbent for the removal of Cr(VI) ions from industrial wastewater has attracted intensive attention. However, low-molecular-weight lignin (LL) has shown poor adsorption performance in this field. Here, an 8-hydroxyquinoline esterified-demethylated lignin-based adsorbent (DL-Na) was prepared to resolve this problem. Compared with LL, the weight-average and number-average molecular weights of DL-Na increased from 1259 and 789 Da to 1932 and 1185 Da. The hydroxyl content of DL is 2.4 mmol/g, and the 8-hydroxyquino-line content is 0.57 mmol/g. These structural characteristics endow it with excellent adsorption capacity for Cr (VI) ions, reaching 767.4 mg/g under optimal conditions. The adsorption model analysis showed that the process might involve chemisorption, with the adsorption ability decreasing as the coverage of Cr ions increases. Notably, DL-Na showed great selectivity for the removal of Cr(VI) ions in a bisolute system. Compared with LL, both total Cr and TOC in the solution after adsorption significantly decreased from 16.9 mg/L and 54.8 mg/L to 3.0 mg/L and 7.4 mg/L, respectively, suggesting effective mitigation of secondary pollution. The mechanism study indicates that the adsorption mainly relied on the reduction ability of hydroxyl groups, electrostatic interactions, and coordination. The quantum chemical calculations showed that only aliphatic hydroxyl group (Al-OH) could slightly attract the Cr(VI) ions, while all oxidized active groups could easily absorb Cr(III) ions. This work provides a feasible method for fabricating an effective low-molecular-weight lignin-based adsorbent for Cr (VI) removal, broadening the high-value utilization of lignin.

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