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<p>The waterlogged ivory relics excavated from the Jinsha site exhibit structural damage and reduced toughness due to burial-induced organic matter decomposition. Therefore, this study employed microbial-induced carbonate precipitation (MICP) to treat waterlogged ivory samples via <i>Sporosarcina pasteurii</i> with a urease enzyme activity of 59.5 U and carbonic anhydrase enzyme activity of 0.34 U. X-ray computed tomography (CT) analysis revealed that calcium carbonate crystals generated through MICP effectively filled pores, reducing total pore volume by 46.7%. Specifically, the microporosity volume and specific surface area of the 1–60 nm pores were reduced by 50.9% and 57.6%, respectively. X-Ray diffraction (XRD) analysis confirmed that the calcium carbonate crystals produced by MICP were calcite and vaterite. In addition, the MICP-treated ivory exhibited a compressive strength of 20.38 MPa, 3.3 times higher than that of untreated samples. These results demonstrated that MICP can effectively strengthen excavated waterlogged ivory.</p>

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Improving structure properties of Jinsha relic ancient ivory by microbial-induced carbonate precipitation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月14日

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  • Yijun Zou,
  • Xiangjun Wei,
  • Shuangfei Xu,
  • Bingqi Jia,
  • Ping Xing,
  • Biao Jiang,
  • Zhijun Zhao

摘要

The waterlogged ivory relics excavated from the Jinsha site exhibit structural damage and reduced toughness due to burial-induced organic matter decomposition. Therefore, this study employed microbial-induced carbonate precipitation (MICP) to treat waterlogged ivory samples via Sporosarcina pasteurii with a urease enzyme activity of 59.5 U and carbonic anhydrase enzyme activity of 0.34 U. X-ray computed tomography (CT) analysis revealed that calcium carbonate crystals generated through MICP effectively filled pores, reducing total pore volume by 46.7%. Specifically, the microporosity volume and specific surface area of the 1–60 nm pores were reduced by 50.9% and 57.6%, respectively. X-Ray diffraction (XRD) analysis confirmed that the calcium carbonate crystals produced by MICP were calcite and vaterite. In addition, the MICP-treated ivory exhibited a compressive strength of 20.38 MPa, 3.3 times higher than that of untreated samples. These results demonstrated that MICP can effectively strengthen excavated waterlogged ivory.