Investigation of γ-Polyglutamic Acid for Heavy Metal Decontamination from Coal Gangue-Based Soil: Quantum Chemical Analysis and Experimental Investigation.

Jing Shi, Xiang Li, Shuo-Jiang Song, Li Feng

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In one paragraph

Article in Molecules (Basel, Switzerland), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

Authors and funding

4 authors.

Jing ShiSchool of Chemical Engineering, China University of Mining and Technology, Xuzhou 221008, China.

Xiang LiCollege of Forestry and Prataculture, Ningxia University, Yinchuan 750021, China.

Shuo-Jiang SongSchool of Chemistry and Materials, Liupanshui Normal University, Liupanshui 553004, China.

Li FengSchool of Chemical Engineering, China University of Mining and Technology, Xuzhou 221008, China.

Funding

College-level Project of Liupanshui Vocational and Technical College Lyk2405National Natural Science Foundation of China U24B2046Skilled Guizhou" Action Plan for Vocational Education in Guizhou Province 202517State Key Laboratory of Coking Coal Resources Green Exploitation, School of Chemical Engi-neering Project NoTechnology Innovation Center for Characteristic Agricultural Products in Mountainous and Plat-eau Areas 520202023018

6 · The paper itself

Abstract

Heavy metal pollution from coal gangue severely degrades mine soil structure and threatens landscape ecological stability. Particularly, γ-polyglutamic acid (γ-PGA), a green biopolymer, offers potential applications for pollution remediation while supporting ecological restoration. To evaluate γ-PGA's efficacy in immobilizing Pb, Cd, and Zn in gangue-based soil and clarify its regulatory mechanism for landscape-friendly remediation, soil samples from a 3-year-weathered gangue hill in the Liupanshui mining area were subjected to indoor leaching experiments with different γ-PGA doses, combined with material characterization and Density Functional Theory (DFT) simulations. The results showed that the optimal γ-PGA dose was 6 g/kg, achieving 93.25% Pb immobilization and reducing Cd/Zn migration risk by over 30%; γ-PGA acted via carboxyl-amide dual-site chelation and hydrogen-bonded agglomeration, forming stable aggregates that inhibited metal migration. DFT calculations confirmed strong chelation for Cu

Indexed as

chelationheavy metal pollutionmolecular modelingsoil remediationγ-polyglutamic

Identifiers

PMID42280086

DOI10.3390/molecules31111779

PMCPMC13257531

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