文献类型：期刊文献

英文题名：Efficient Removal of Heavy Metals from Aqueous Solution Using Licorice Residue-Based Hydrogel Adsorbent

作者：Yin, Xiaochun[1,2];Ke, Ting[2];Zhu, Hai[2];Xu, Pei[1];Wang, Huiyao[1]

第一作者：Yin, Xiaochun;殷晓春

通信作者：Yin, XC[1];Wang, HY[1];Yin, XC[2]

机构：[1]New Mexico State Univ, Dept Civil Engn, Las Cruces, NM 88003 USA;[2]Gansu Univ Chinese Med, Sch Publ Hlth, Lanzhou 730000, Peoples R China

第一机构：New Mexico State Univ, Dept Civil Engn, Las Cruces, NM 88003 USA

通信机构：[1]corresponding author), New Mexico State Univ, Dept Civil Engn, Las Cruces, NM 88003 USA;[2]corresponding author), Gansu Univ Chinese Med, Sch Publ Hlth, Lanzhou 730000, Peoples R China.|[10735e9d5e7087247e71b]甘肃中医药大学公共卫生学院;[10735]甘肃中医药大学;

年份：2023

卷号：9

期号：7

外文期刊名：GELS

收录：;Scopus(收录号：2-s2.0-85166283544);WOS:【SCI-EXPANDED(收录号:WOS:001035990800001)】；

语种：英文

外文关键词：hydrogel; Chinese herb; adsorbent; heavy metals; cellulose; remove

摘要：The removal of heavy metals through adsorption represents a highly promising method. This study focuses on the utilization of an abundant cellulose-rich solid waste, licorice residue (LR), as a natural material for hydrogel synthesis. To this end, LR-EPI hydrogels, namely, LR-EPI-5, LR-EPI-6 and LR-EPI-8, were developed by crosslinking LR with epichlorohydrin (EPI), specifically targeting the removal of Pb, Cu, and Cr from aqueous solutions. Thorough characterizations employing Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy confirmed the successful crosslinking of LR-EPIs by EPI, resulting in the formation of porous and loosely structured hydrogels. Batch studies demonstrated the high efficacy of LR-EPI hydrogels in removing the three heavy metal ions from aqueous solutions. Notably, LR-EPI-8 exhibited the highest adsorption capacity, with maximum capacities of 591.8 mg/g, 458.3 mg/g, and 121.4 mg/g for Pb2+, Cr3+, and Cu2+, respectively. The adsorption processes for Pb2+ and Cu2+ were well described by pseudo-second-order kinetics and the Langmuir model. The adsorption mechanism of LR-EPI-8 onto heavy metal ions was found to involve a combination of ion-exchange and electrostatic interactions, as inferred from the results obtained through X-ray photoelectron spectroscopy and FTIR. This research establishes LR-EPI-8 as a promising adsorbent for the effective removal of heavy metal ions from aqueous solutions, offering an eco-friendly approach for heavy metal removal and providing an environmentally sustainable method for the reutilization of Chinese herb residues. It contributes to the goal of "from waste, treats waste" while also addressing the broader need for heavy metal remediation.