环境炭质介导胞外电子传递转化污染物的机制
The mechanism of mediating extracellular electron transfer by environmental carbonaceous matter to contaminant transformation
余晨 1王旺民 2李纯阳 2王晶晶 2储刚 1王振 2司友斌2
作者信息
- 1. 昆明理工大学环境科学与工程学院,昆明,650500;安徽农业大学资源与环境学院,合肥,230036
- 2. 安徽农业大学资源与环境学院,合肥,230036
- 折叠
摘要
环境炭质可作为电子穿梭体,介导微生物胞外电子传递行为,调控着生物地球化学循环过程.直接和间接电子传递是微生物胞外电子传递过程的两种形式.在间接电子传递中,微生物利用电子穿梭体实现电子从胞内到胞外的迁移,除了微生物自身分泌的穿梭体之外,外源性电子穿梭体也被发现可以促进胞内外的电子转移过程,其中天然和人工的电子穿梭体(如腐殖质、生物炭等)在微生物胞外电子传递过程中均发挥着重要的介导作用,改变了胞外电子转移途径.环境炭质的微尺度结构决定了其介导电子转移的功能.于此,本文以两种外源性电子穿梭体的介导表现为研究主体,系统归纳了以腐殖质、生物炭为代表的环境炭质具有的氧化还原活性基团(如醌/酚类基团)和石墨化芳香炭结构(稠环芳香区域)、以及富碳介质的电子穿梭性能和机制;详述了环境炭质介导胞外电子转化典型的污染物(重金属和有机物)的效果;最后,总结了环境炭质(天然有机质和人工有机炭)在土壤、沉积物或水体系统参与介导胞外电子转移过程,并展望了当前研究所面临的挑战,这为新型电子穿梭介质的设计研发和工程应用提供技术支撑.
Abstract
Environmental carbonaceous matter as an electron shuttle,can mediate electron transferthat regulates biogeochemical cycling processes.Microbial extracellular electron processes are of two types;direct and indirect electron transfers.In indirect electron transfer,microorganisms use electron shuttles to migrate electrons from intracellular to extracellular.In addition to microorganisms'own secreted shuttles,exogenous electron shuttles have also been found facilitating the intra-and extracellular electron transfer processes.Both natural and artificial electron shuttles(e.g.,humic substance,biochar,etc.)play an important mediating role in extracellular electron transfer process by changing the pathway of electron transfer.The microscale structure of environmental carbonaceous matter determines its function in mediating electron transfer.Herein,the main subject of this review is to highlight the mediating behavior of two exogenous electron shuttles along with systematical summarization of the redox-active groups(e.g.,quinone/phenol groups)and graphitized aromatic carbon(e.g.,polycyclic aromatic regions),as well as the electron transfer properties and mechanisms of environmental carbonaceous matter.The effect of mediating extracellular electron transfer on the transformation of representative contaminants(e.g.,heavy metals and organic pollutants)by environmental carbonaceous matter was described in detail.Conclusively,we included the mediated extracellular electron transfer by natural and engineered carbons in soil,sediment,or water systems and came up with the emerging future research challenges.The aim of this review is at providing a technical support for the design development and engineered application of novel electron shuttle materials.
关键词
天然有机质/人工有机炭/介导电子传递/重金属转化/有机物降解Key words
natural organic matter/engineered carbon/mediated electron transfer/heavy metal transformation/organic pollutant degradation引用本文复制引用
基金项目
国家自然科学基金(42107406)
国家自然科学基金(42077123)
出版年
2024
NETL
NSTL
万方数据