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<p>Soil contaminated with heavy metal and oil pollution pose significant environmental challenges, necessitating effective soil remediation. This study investigates the stabilization of soil contaminated with Cr₂(NO₃)₃·9&#xa0;H₂O, glycerol (GLY), and oleic acid (OA), using Geopolymer Cementitious Agent (GCA) under varying concentrations and curing ages. Compared with the original soil samples without GCA, the soil strength was improved. The experimental results show that GLY and OA can greatly reduce the strength of solidified soil in a certain range, and the reduction of GLY is greater than that of OA. The incorporation of Cr<sub>2</sub>(NO<sub>3</sub>)<sub>3</sub>.9H<sub>2</sub>O also has a certain reduction effect on the strength of solidified soil, and with the increase of GCA content and curing age, the strength of solidified soil will also increase slightly. The strength of Cr leaching is opposite to that of solidified soil, that is, with the increase of solidified soil strength, the leaching of heavy metals decreases. The results of SEM (scanning electron microscope), along with elevated levels of GCA, the structure of the stabilized soil by loose tend to close, the gel type material by fibrous tend to layer, at the same time as the GLY and elevated levels of OA, fibrous structure is becoming more and more rounded, flake of layered structure of less and less, gradually be dissolved pore, The structure becomes loose.</p>

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Stabilization of Cr-contaminated soil with geopolymer binder under oleic acid and glycerol Co-contamination

  • 期刊论文

  • 发表日期：

    2026年5月4日

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  • Chonggen Pan,
  • Yuxin Huang,
  • Yajun Li,
  • Zhigao Wei,
  • Jiawei Zang,
  • Xiao Cheng

摘要

Soil contaminated with heavy metal and oil pollution pose significant environmental challenges, necessitating effective soil remediation. This study investigates the stabilization of soil contaminated with Cr₂(NO₃)₃·9 H₂O, glycerol (GLY), and oleic acid (OA), using Geopolymer Cementitious Agent (GCA) under varying concentrations and curing ages. Compared with the original soil samples without GCA, the soil strength was improved. The experimental results show that GLY and OA can greatly reduce the strength of solidified soil in a certain range, and the reduction of GLY is greater than that of OA. The incorporation of Cr2(NO3)3.9H2O also has a certain reduction effect on the strength of solidified soil, and with the increase of GCA content and curing age, the strength of solidified soil will also increase slightly. The strength of Cr leaching is opposite to that of solidified soil, that is, with the increase of solidified soil strength, the leaching of heavy metals decreases. The results of SEM (scanning electron microscope), along with elevated levels of GCA, the structure of the stabilized soil by loose tend to close, the gel type material by fibrous tend to layer, at the same time as the GLY and elevated levels of OA, fibrous structure is becoming more and more rounded, flake of layered structure of less and less, gradually be dissolved pore, The structure becomes loose.