Preparation of dispersed iron-sulfur-based nanoparticle slurry and its application in remediating Cr（Ⅵ） contamination

XING Ningning; ZHANG Hongling; JIANG Hui; XU Hongbin

doi:10.13205/j.hjgc.202606011

Volume 44 Issue 6

Jun. 2026

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XING Ningning, ZHANG Hongling, JIANG Hui, XU Hongbin. Preparation of dispersed iron-sulfur-based nanoparticle slurry and its application in remediating Cr（Ⅵ） contamination[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(6): 101-112. doi: 10.13205/j.hjgc.202606011

Citation:

XING Ningning, ZHANG Hongling, JIANG Hui, XU Hongbin. Preparation of dispersed iron-sulfur-based nanoparticle slurry and its application in remediating Cr（Ⅵ） contamination[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(6): 101-112. doi: 10.13205/j.hjgc.202606011

Citation:

XING Ningning, ZHANG Hongling, JIANG Hui, XU Hongbin. Preparation of dispersed iron-sulfur-based nanoparticle slurry and its application in remediating Cr（Ⅵ） contamination[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(6): 101-112. doi: 10.13205/j.hjgc.202606011

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Preparation of dispersed iron-sulfur-based nanoparticle slurry and its application in remediating Cr（Ⅵ） contamination

doi: 10.13205/j.hjgc.202606011

XING Ningning^1,2,3,4,
ZHANG Hongling^{1,2,3,4
,
,},
JIANG Hui^1,3,4,
XU Hongbin^1,2,3,4

1. CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. National Engineering Research Center of Green Recycling for Strategic Metal Resources, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
4. State Key Laboratory of Petroleum Molecular & Process Engineering, Beijing 100083, China

Received Date: 2025-05-30
Accepted Date: 2025-07-12
Rev Recd Date: 2025-06-20

Available Online: 2026-07-06

Abstract

Abstract

To address the remediation of hexavalent chromium ［Cr（Ⅵ）］ contamination in solid-phase media，such as chromite ore processing residue （COPR） and chromium-contaminated soil from chromium chemical industries， a novel dispersedly stabilized iron-sulfur-based slurry （DSS-ISB） was developed. The slurry was modified with an inorganic dispersant to enhance the suspension stability and interfacial reactivity of iron-sulfur nanoparticles. The particle size of the slurry was approximately 200 nm， enabling efficient reduction and immobilization of Cr（Ⅵ） without pH adjustment. Optimization experiments achieved the optimal process parameters： a liquid-to-solid ratio of 5 mL∶10 g， and a DSS-ISB dosage of 1.8 mg/g. Under these conditions， the system achieved a Cr（Ⅵ） removal efficiency exceeding 97%， reducing the leaching concentration from 15.03 mg/L to 0.03 mg/L， which was below the China national standard limit of 5 mg/L （GB 5085.3—2007）. X-ray photoelectron spectroscopy （XPS） and Brunauer-Emmett-Teller （BET） analysis revealed that the remediation mechanism of DSS-ISB involves a combination of chemical reduction （with Fe²⁺/S^2- as dual electron donors） and surface adsorption， effectively converting toxic Cr（Ⅵ） into stable Cr（Ⅲ）. Under the same remediation standard， compared with traditional reductants ferrous sulfate （FeSO₄） and sodium sulfide （Na₂S）， DSS-ISB increased the Cr（Ⅵ） removal efficiency by 28.24% and 6.23%， respectively， and increased the unit mass removal capacity by 92.43% and 77.08%， respectively. Meanwhile， the reagent cost per ton of COPR treated was reduced to RMB 36.40 yuan， achieving cost reductions of 33.82% and 26.02%，compared with FeSO₄ （RMB 55.00 yuan） and Na₂S （RMB 49.20 yuan）， respectively. In addition， the remediation process was simplified by eliminating the need for pH adjustment and subsequent passivation treatment. The DSS-ISB system is highly applicable to both COPR and in-situ chromium-contaminated soil， providing an economically efficient solution for the green remediation of Cr（Ⅵ） contamination.
- iron-sulfur-based slurry,
- dispersed stabilization,
- chromite ore processing residue,
- chromium-contaminated soil,
- reduction and adsorption

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References(42)

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