严酷的循环环境对自愈微生物诱导的碳酸钙材料防止Pb2+迁移的影响

Zhong-Fei Xue, Wen-Chieh Cheng, Lin Wang, Yi-Xin Xie, Peng Qin
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引用次数: 2

摘要

微生物诱导碳酸盐降水(MICP)在铅污染水体和土壤修复中的应用越来越受到重视。然而,MICP过程产生的与铅有关的沉淀物在恶劣环境下,随着时间的推移可能会浸出酸,对人体健康造成严重威胁。本研究首次提出了自愈性微生物诱导碳酸钙(MICC)材料,并将其应用于防止Pb2+的迁移,其中pb相关沉淀物在孢子萌发、孢子-营养细胞转化、脲酶分泌、尿素水解等过程中被酸浸,从而产生含孢子沉淀物。这个过程重复了五次,以探索恶劣的循环环境对自我修复MICC材料的影响。结果表明,在孢子萌发和孢子-营养细胞转化过程中,如果没有肌苷和微量元素的干预,Pb的固定化将会恶化。孢子和营养细胞为Pb2+和矿物质的附着提供了额外的成核位点。细胞外聚合物质(eps)将Pb2+与官能团和化学键结合,以防止其迁移到周围环境。扫描电镜-能量色散x射线能谱(SEM-EDS)图像也表明,由于Pb2+与CO32-和OH-结合的亲和力更强,铜矿矿物先于方解石矿物析出。五次循环后固定效率基本保持在95%以上,而忽略自愈性的MICC材料,三次循环后固定效率迅速下降到10%以下,凸显了它们的相对优势。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of a harsh circular environment on self-healing microbial-induced calcium carbonate materials for preventing Pb2+ migration
Microbially induced carbonate precipitation (MICP) is increasingly being explored for Pb-contaminated water bodies and soil remediation. However, the Pb-related precipitate resulting from the MICP process can possibly leach acid over time when subjected to harsh environments, causing serious threats to human health. In this study, for the first time, self-healing microbial-induced calcium carbonate (MICC) materials are proposed and applied to prevent Pb2+ migration where the Pb-related precipitate is acid leached after spore germination, spore-vegetative cell transformation, urease secretion, and urea hydrolysis, thereby producing spore-containing precipitation. This process was repeated five times to explore the effect of a harsh circular environment on self-healing MICC materials. Results indicated that Pb immobilization would have deteriorated if the inosine and trace elements had not been intervened during spore germination and spore-vegetative cell transformation, respectively. The spores and vegetative cells provided extra nucleation sites for Pb2+ and minerals to attach. The extracellular polymeric substances (EPSs) combined Pb2+ with functional groups and chemical bonds to prevent their migration to surrounding environments. The scanning electron microscopy–energy-dispersive X-ray spectroscopy (SEM–EDS) images also indicated that the cerussite mineral was precipitated prior to the calcite mineral because Pb2+ had more affinity to combine with CO32- and OH-. An immobilization efficiency of greater than 95% remained nearly the same after five cycles, while it reduced very quickly to less than 10% after three cycles when neglecting the self-healing MICC materials, thus highlighting their relative merits.
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