矿物光电子-微生物体系重金属离子价态调控及其环境效应研究进展

Research Advances in the Valence State Regulation of Heavy Metal Ions of Photoelectron-Microorganism System and Its Environmental Effect

本文综述了典型污染区重金属离子赋存状态与环境风险评价、环境微生物多样性等环境质量因子的关系及其对土壤功能的影响;重点介绍了微生物源电子、半导体矿物光电子对重金属离子的价态调节双向控制;总结了电子穿梭体、空穴捕获剂等小分子有机物对光电子还原重金属离子的影响及机制,以及半导体矿物光电子、重金属价电子协同微生物对重金属离子的还原氧化效率与价态调控;分析了微生物及其表面基团对重金属离子的矿化与转化作用,以及微生物界面固定转化在土壤重金属污染修复中的作用。本综述可为进一步研究微生物和半导体矿物光电子协同作用对重金属离子的定向调节、电子转移途径、晶相转化机制提供指导,对深入探讨光-半导体矿物-重金属离子-微生物多相复杂体系的交互作用具有重要的环境学意义。

This study reviewed the speciation of heavy metal ions in typical contaminated area and assessed their relationship with environmental risk assessment and environmental quality such as microbial activity,as well as their influence on soil functions.This work highlighted the role of microbe electron and semiconductor mineral photoelectron on heavy metal ions valence variation,discussed the effect of small organic molecules（i.e.,electron shutter and photohole scavenger） on the reduction of heavy metal ions.We also analyzed the efficiency of redox reaction of heavy metal ions by the synergetic effect of microbes,mineral photoelectron and heavy metal ions electron.In addition,this work introduced the biomineralization process of heavy metal ions by microbes and functional groups on microbial surface and its potential on the remediation of contaminated soils.The aim of this review is try to provide the guideline to study the directional regulation of heavy metal ions valence,electron transfer pathway,and phase transformation in heavy metal ions-microorganisms-photoelectron system,which has an important environmental implication on in-depth exploring the interaction of light-semiconductor minerals-microorganisms complex system.