Efficient Recovery of Rare Earth Elements from Acidic Wastewater by a Green β‐CDs‐Functionalized Nanosponge

Author:

Xu Junxin1,Wang Dandan1,Yang Jianmei1,He Junnan1,Yang Tong1,Zhao Xue1,Liu Xiaoqing2,Zhang Jin1ORCID,Zhang Lei1,Zhao Yan1ORCID

Affiliation:

1. College of Chemistry and Chemical Engineering Yunnan Normal University Kunming 650500 P. R. China

2. Shenzhen Kewode Technology Co., Ltd Shenzhen 518028 P. R. China

Abstract

AbstractThe recovery of rare earth elements (REEs) from acidic wastewater is crucial to sustainable development, industrial processes, and human health. In this research, β‐cyclodextrin‐based nanosponges (β‐CD/PVA‐SA NSs) have been proposed as potential adsorbents for europium (Eu), dysprosium (Dy), and gadolinium (Gd) recovery. The nanosponges are synthesized by cross‐linking β‐cyclodextrin (β‐CD) functionalized polyvinyl alcohol (PVA) and sodium alginate (SA). Experimental results indicate that β‐CD/PVA‐SA NSs exhibit favorable selectivity for Eu, Dy, and Gd, with the maximum adsorption capacity of 222, 217, and 204 mg/g, respectively, in addition to stability and cyclicity. β‐CD/PVA‐SA NSs maintain selective adsorption effects towards RE ions that are present in acidic mine drainage (AMD), thereby highlighting their potential for practical applications. Furthermore, density functional theory (DFT) simulations have unveiled the fundamental interactions between the functional groups anchored in β‐CD/PVA‐SA NSs and the REEs, providing vital insights into their adsorption mechanism. Hence, the utilization of β‐CD/PVA‐SA NSs has the potential to advance initiatives in remediating acidic water pollution and facilitating the sustainable recycling of RE resources.

Funder

Yunnan Provincial Department of Education Science Research Fund Project

National Natural Science Foundation of China

Publisher

Wiley

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