School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester, UK.
Environ Technol. 2009 Nov;30(12):1313-26. doi: 10.1080/09593330902984751.
The metal-reducing bacteria Geobacter sulfurreducens, Shewanella oneidensis and Veillonella atypica, use different mechanisms to transform toxic, bioavailable sodium selenite to less toxic, non-mobile elemental selenium and then to selenide in anaerobic environments, offering the potential for in situ and ex situ bioremediation of contaminated soils, sediments, industrial effluents, and agricultural drainage waters. The products of these reductive transformations depend on both the organism involved and the reduction conditions employed, in terms of electron donor and exogenous extracellular redox mediator. The intermediary phase involves the precipitation of elemental selenium nanospheres and the potential role of proteins in the formation of these structures is discussed. The bionanomineral phases produced during these transformations, including both elemental selenium nanospheres and metal selenide nanoparticles, have catalytic, semiconducting and light-emitting properties, which may have unique applications in the realm of nanophotonics. This research offers the potential to combine remediation of contaminants with the development of environmentally friendly manufacturing pathways for novel bionanominerals.
金属还原细菌 Geobacter sulfurreducens、Shewanella oneidensis 和 Veillonella atypica 利用不同的机制将有毒的、生物可利用的亚硒酸钠转化为毒性较小的、非移动的元素硒，然后在厌氧环境中将其转化为硒化物，为污染土壤、沉积物、工业废水和农业排水的原位和异位生物修复提供了可能。这些还原转化的产物不仅取决于所涉及的生物体，还取决于还原条件，包括电子供体和外源性细胞外氧化还原介质。中间阶段涉及元素硒纳米球的沉淀，并且讨论了蛋白质在这些结构形成中的潜在作用。在这些转化过程中产生的生物纳米矿物相，包括元素硒纳米球和金属硒化物纳米颗粒，具有催化、半导体和发光特性，这可能在纳米光子学领域具有独特的应用。这项研究有可能将污染物的修复与新型生物纳米矿物的环保制造途径的开发结合起来。
