S-[2-(Hydroxyamino)-2-oxoethyl]-O-octyl-dithiocarbonate Ester (EHAOX): Performance and Adsorption Mechanism

Authors

• Yue Zhou, Inner Mongolia University of Science and Technology
• Jiaxiang Li, Inner Mongolia University of Science and Technology
• Hongli Fan, Inner Mongolia University of Science and Technology
• Zhilong Li, Inner Mongolia University of Science and Technology
• Yuesheng Gao, Michigan Technological UniversityFollow
• Tian Lin, Inner Mongolia University of Science and Technology
• Haiyan Tang, Inner Mongolia University of Science and Technology
• Tingting Wang, Baotou Research Institute of Rare Earth
• Wei Sun, Central South University

Document Type

Article

Publication Date

6-1-2026

Department

Department of Chemical Engineering

Abstract

This study explores the interfacial interactions between a novel collector, S-[2-(hydroxyamino)-2-oxoethyl]-O-octyl-dithiocarbonate ester (EHAOX), and bastnaesite mineral surfaces during selective flotation. Compared to conventional octylhydroxamic acid (OHA), EHAOX demonstrated superior recovery, achieving an over 40% absolute increase in recovery compared to octylhydroxamic acid (OHA) at the same collector concentration (1 × 10⁻⁵ mol/L) and pH 8.0, and selectivity for bastnaesite, attributed to its optimized hydrophobicity (supported by CLogP calculations). Mechanistic studies via zeta potential, UV/vis spectroscopy, and FTIR revealed the formation of a complex composite via chemisorption between EHAOX and Ce³⁺ sites on the bastnaesite surface, with coordination occurring through the sulfur (N-C(=S)) and oxygen (-C(=O)N-OH) functional groups. This selective adsorption minimized EHAOX’s affinity for calcite, highlighting its potential for tailoring composite mineral separation processes. The findings advance the design of functionalized collectors for rare-earth mineral enrichment, with implications for composite material processing in resource recovery.

Publisher's Statement

Copyright: © 2026 by the authors. Licensee MDPI, Basel, Switzerland. Publisher’s version of record: https://doi.org/10.3390/min16060582

Publication Title

Minerals

Recommended Citation

Zhou, Y., Li, J., Fan, H., Li, Z., Gao, Y., Lin, T., Tang, H., Wang, T., & Sun, W. (2026). S-[2-(Hydroxyamino)-2-oxoethyl]-O-octyl-dithiocarbonate Ester (EHAOX): Performance and Adsorption Mechanism. Minerals, 16(6). http://doi.org/10.3390/min16060582
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p2/2751

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

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