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基于碱木质素的聚（四乙烯五胺-邻苯三酚）吸附剂对六价铬的高容量快速去除

High capacity and fast removal of Cr(vi) by alkali lignin-based poly(tetraethylene pentamine-pyrogallol) sorbent.

作者信息

Xing Rufei, Song Yanxin, Gao Tingting, Cai Xiaoxia, Yao Jinshui, Liu Qinze, Zhang Changbin

机构信息

School of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences) #3501 Daxue Road, Western University Science Park Jinan 250353 Shandong Province P. R. China

School of Chemical Engineering & Pharmacy, Jining Technician College #3166 Chongwen Road Jining 272100 Shandong Province P. R. China

出版信息

RSC Adv. 2023 Jan 9;13(3):1627-1639. doi: 10.1039/d2ra07143f. eCollection 2023 Jan 6.

DOI:10.1039/d2ra07143f
PMID:36688065
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9827104/
Abstract

In this work, a novel alkali lignin-based adsorption material, alkali lignin-based poly(tetraethylene pentamine-pyrogallol) (AL-PTAP), was prepared using a Mannich reaction and catechol-amine reaction for removal of Cr(vi). It was characterized by thermogravimetric analysis (TGA), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The effects of tetraethylene pentamine (TEPA) dosage, pyrogallol (PL) dosage, contact time, pH, temperature and other factors on the adsorption behavior of the adsorbent were systematically investigated. These experimental data show that the adsorption behavior conforms to the pseudo-second-order kinetic model and the Langmuir isotherm model. The maximum adsorption capacity is 769.2 mg g at 303 K, which is much higher than that of alkali lignin (AL). AL-PTAP can achieve a removal rate of almost 100% for Cr(vi) solutions with a concentration of less than 90 mg L at 1 min. Furthermore, the toxic Cr(vi) is partly reduced to nontoxic Cr(iii) during the adsorption process. Therefore, AL-PTAP is a fast and efficient alkali lignin-based adsorbent, which is expected to improve the utilization value of alkali lignin in Cr(vi) wastewater treatment.

摘要

在本工作中，通过曼尼希反应和邻苯二酚-胺反应制备了一种新型的碱木质素基吸附材料，即碱木质素基聚（四乙烯五胺-邻苯三酚）（AL-PTAP），用于去除Cr(Ⅵ)。通过热重分析（TGA）、扫描电子显微镜（SEM）、傅里叶变换红外光谱（FT-IR）和X射线光电子能谱（XPS）对其进行了表征。系统研究了四乙烯五胺（TEPA）用量、邻苯三酚（PL）用量、接触时间、pH值、温度等因素对吸附剂吸附行为的影响。这些实验数据表明，吸附行为符合准二级动力学模型和朗缪尔等温线模型。在303K时，最大吸附容量为769.2mg/g，远高于碱木质素（AL）。AL-PTAP对浓度小于90mg/L的Cr(Ⅵ)溶液在1min内的去除率可达近100%。此外，在吸附过程中，有毒的Cr(Ⅵ)部分还原为无毒的Cr(Ⅲ)。因此，AL-PTAP是一种快速高效的碱木质素基吸附剂，有望提高碱木质素在Cr(Ⅵ)废水处理中的利用价值。

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