Sorption/desorption of phenanthrene and ofloxacin by microbial-derived organic matter-mineral composites

文献类型： 外文期刊

第一作者： Li, Fangfang

作者： Li, Fangfang;Yan, Qiuling;Li, Zhongwen;Tan, Zhicheng;Li, Yuxuan;Wang, Siyao;Peng, Hongbo;Wang, Lin;Guo, Jiawen;Peng, Hongbo;Wang, Lin

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关键词： microbial-derived organic matter; mineral; phenanthrene; ofloxacin; sorption; desorption

期刊名称：FRONTIERS IN ENVIRONMENTAL SCIENCE （ 影响因子：3.7； 五年影响因子：4.1 ）

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年卷期： 2024 年 12 卷

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收录情况： SCI

摘要： Introduction Soil organic matter plays an important role in the long-term "locking" of organic contaminants in soil environment. Recently, microbial-derived organic matter have been recognized as essential components of stabilized soil carbon pools. However, the contribution of microbial-derived organic matter to sorption of organic contaminants remains unclear.Methods Here, we obtained microbial-derived organic matter-mineral composites by inoculating model soil (a mixture of hematite and quartz sand (FQ) or montmorillonite and quartz sand (MQ)) with natural soil microorganisms and different substrate-carbon (glycine (G), glucose (P), or 2, 6-Dimethoxyphenol (B)), which were named GF, PF, BF, GM, BM, and PM, respectively. Batch sorption/desorption experiments were conducted for phenanthrene (PHE) and ofloxacin (OFL) on the composites.Results and Discussion The composites cultured with 2,6-dimethoxyphenol had the highest carbon content (0.98% on FQ and 2.11% on MQ) of the three carbon substrates. The carbon content of the composites incubated with MQ (0.64%-2.11%) was higher than that with FQ (0.24%-0.98%), indicating that montmorillonite facilitated the accumulation of microbial-derived organic matter owing to its large specific surface area. The sorption of PHE by microbial-derived organic matter was mainly dominated by hydrophobic partitioning and pi-pi conjugation, whereas the sorption of OFL was mainly dominated by hydrophobic hydrogen bonding and pi-pi conjugation. The sorption of OFL onto the composites was more stable than that of PHE. Microbial-derived organic matter -mineral composites can reduce the risk of organic contaminant migration in soil, particularly ionic organic contaminants.

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