Sustainable remediation of Cr(
                    VI
                    )‐contaminated soil using mechanochemically activated phosphogypsum‐slag composites

Tianyu Han; Jun Tai; Yiqie Dong; Haijun Lu; Jun Xu

doi:10.1002/ep.70303

journal article Dec 31, 2025

Sustainable remediation of Cr( VI )‐contaminated soil using mechanochemically activated phosphogypsum‐slag composites

Tianyu Han

Jun Tai

Yiqie Dong Haijun Lu

Jun Xu

Environmental Progress & Sustainable Energy Vol. 45 No. 2 · Wiley

View at Publisher Save 10.1002/ep.70303

Abstract

Abstract
With rapid industrialization, the environmental challenges of industrial solid waste demand urgent solutions. This study develops a novel composite environmental material (PSEM) via mechanochemical activation of phosphogypsum (PG) and slag. The influence of PSEM mix ratios on the solidification of hexavalent chromium [Cr(VI)]‐contaminated soil was investigated through particle size analysis, unconfined compression tests, volume shrinkage, and toxicity leaching assessments, supported by Brunauer–Emmet–Teller (BET), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and x‐ray photoelectron spectroscopy (XPS) characterizations. Mechanochemical activation significantly reduced PSEM particle size and enhanced reactivity. At a slag‐to‐PG ratio of 1:1.2, compressive strength reached 3.927 MPa, volume shrinkage stabilized at 0.388%–2.530%, and Cr(VI) leaching declined to 0.137 mg/L. The solidified matrix exhibited mesoporous structures with increased surface area, while Cr(VI) was immobilized through chemical substitution and physical encapsulation. These findings demonstrate the potential of PSEM for Cr(VI) stabilization and promote the sustainable utilization of PG.

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Details

Published: Dec 31, 2025
Vol/Issue: 45(2)
License: View

Authors

T

Tianyu Han

School of Civil Engineering and Architecture Wuhan Polytechnic University Wuhan China

J

Jun Tai

Central & Southern China Municipal Engineering Design and Research Institute Co., Ltd. Wuhan China

Y

Yiqie Dong

School of Civil Engineering and Architecture Wuhan Polytechnic University Wuhan China; State Key Laboratory of Water Resources Engineering and Management Wuhan University Wuhan China

H

Haijun Lu

School of Civil Engineering and Architecture Wuhan Polytechnic University Wuhan China

J

Jun Xu

Science and Technology Innovation Center Hubei Institute of Urban Geological Engineering Wuhan China

Funding

National Natural Science Foundation of China Award: 52500182

Cite This Article

Tianyu Han, Jun Tai, Yiqie Dong, et al. (2025). Sustainable remediation of Cr( VI )‐contaminated soil using mechanochemically activated phosphogypsum‐slag composites. Environmental Progress & Sustainable Energy, 45(2). https://doi.org/10.1002/ep.70303

Sustainable remediation of Cr( VI )‐contaminated soil using mechanochemically activated phosphogypsum‐slag composites

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