A perspective of microemulsions in critical metal separation and recovery: Implications for potential application of CO2-responsive microemulsions

Haoxuan Wang; Wei Wang; Guangli Zhu; Yijun Cao; Ling Zhang

doi:10.1016/j.chemosphere.2023.139494

A perspective of microemulsions in critical metal separation and recovery: Implications for potential application of CO₂-responsive microemulsions

Chemosphere. 2023 Oct:338:139494. doi: 10.1016/j.chemosphere.2023.139494. Epub 2023 Jul 12.

Authors

Haoxuan Wang¹, Wei Wang², Guangli Zhu³, Yijun Cao⁴, Ling Zhang⁵

Affiliations

¹ School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, China.
² Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou, 450001, Henan, China; School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, China.
³ Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou, 450001, Henan, China.
⁴ Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou, 450001, Henan, China; School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, China. Electronic address: yijuncao@126.com.
⁵ Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou, 450001, Henan, China; School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, China. Electronic address: zhang_ling@zzu.edu.cn.

PMID: 37451640
DOI: 10.1016/j.chemosphere.2023.139494

Abstract

Since the discovery of microemulsions, they have attracted great attention due to its unique properties, such as ultra-low interfacial tension and nanoscale droplets. During the past several decades, microemulsions have shown unparalleled advantages in critical metal separation and recovery, e.g., high separation rate, high recovery efficiency, and good selectivity. Therefore, fundamental understandings of such metal recovery behavior are of great significance for the continuous development of microemulsion-based separation technology in this field. Herein, we first systematically reviewed the application of regular microemulsion in the separation and recovery process of critical metals focusing on their separation mechanisms. Then, we summarized the recent progress of CO₂-responsive microemulsions and highlighted their potential application in critical metal separation and recovery, aiming to provide some insights into alleviating the difficulties in demulsification during the stripping stage using regular microemulsions. In this section, the latest development of CO₂-responsive microemulsions is introduced, and the relationship between their composition, microstructure and macroscopic properties is discussed. Discussion and future perspectives are provided highlighting the design of new microemulsions and potential application of CO₂-responsive microemulsions for metal separation and recovery in the future.

Keywords: CO(2)-Responsive; Critical metals; Demulsification; Microemulsion; Separation and recovery.

Publication types

Review

MeSH terms

Carbon Dioxide* / chemistry
Emulsions / chemistry

Substances

Carbon Dioxide
Emulsions