Effects of Different Ionic Liquids on Microbial Growth and Microbial Communities’ Structure of Soil
Bulletin of Environmental Contamination and Toxicology（2025）
Donghua University
Abstract
Ionic liquids (ILs) are widely used “green solvent” as they have a low vapor pressure and can replace volatile solvents in industry. However, ILs are difficult to biodegrade and are potentially harmful to the environment. This study, herein, investigated the toxicity of three imidazole ILs ([C8MIM]Cl, [C8MIM]Br, and [C8DMIM]Br) towards soil microorganisms. The results showed that the ILs inhibited the growth of soil culturable microorganisms and affected the activity of soil enzyme. In addition, microbial communities’ species and abundance in soil were altered. Finally, functional prediction analysis revealed that ILs mainly affected the carbohydrate metabolism and amino acid metabolic processes of the microorganisms. ILs with single methyl substituent had a more pronounced effect than those with double methyl substituents. The study indicates that the use of ILs with double methyl substituents is more environmentally safe, and that the toxicity of ILs should be taken into account in industrial production for the design and production of more environmentally safe types, such as ILs with double methyl substituents.
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Key words
Ionic liquids,Toxicity,Soil microorganisms,High throughput sequencing
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