Enhancing Cr(VI) bio-reduction by conductive materials and enrichment of functional microbes under anaerobic conditions.
Enhancing Cr(VI) bio-reduction by conductive materials and enrichment of functional microbes under anaerobic conditions.
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在厌氧条件下通过导电材料增强 Cr(VI) 生物还原和功能微生物的富集。
DOI：
10.1016/j.chemosphere.2021.132150
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发表时间：
2022-01
期刊：
影响因子：
8.8
通讯作者：
Gan Min
中科院分区：
文献类型：
--
作者：
Chen Fang;Lei Pan;He Peng;Gu Chunyao;Chen Yaozong;Zhang Ke;Zhu Jianyu;Gan Min
一些研究报道了矿物电导率特性对污染物-矿物-微生物相互作用以及相互作用过程中微生物群落结构变化的影响。为了填补这一空白，将导电矿物（磁铁矿/赤铁矿）和绝缘矿物（石英）引入 Cr(VI) 还原系统中，以研究矿物导电性能对 Cr(VI) 去除的影响。结果表明，与绝缘矿物相比，导电矿物提高了 Cr(VI) 的还原率。当ERB（细胞外呼吸道细菌）和导电矿物质同时存在时，比仅含有矿物质（<10%）或ERB（<55%）时观察到更高的减少百分比（>86%），表明该生物修复系统存在协同效应。此外，表面元素检测表明，当ERB存在时，导电矿物表面覆盖有较高的含Fe基团和Fe(III)-Cr(III)络合物。电化学数据表明，ERB 促进了导电矿物表面的电子转移活性。我们的结果表明，导电矿物确实起到了“电子穿梭”的作用，而绝缘矿物则增加了吸附位点，加速了 Cr(VI) 的还原。 16S rRNA序列结果表明，导电矿物质改变了微生物群落结构，增加了包括假单胞菌在内的功能微生物的多样性。和微小杆菌属。该工作对于更好地理解元素生物地球化学过程和污染物消除具有深远意义。
A few studies reported the impact of mineral conductivity properties on contaminant-mineral-microbe interactions and microbial community structure changes in the interaction process. To fill the gap, conductive minerals (magnetite/hematite) and an insulative mineral (quartz) were introduced into Cr(VI) reduction systems to investigate the effect of mineral conductivity properties on Cr(VI) removal. Results showed that conductive minerals enhanced Cr(VI) reduction rate as compared to insulative minerals. Higher reduction percentage (>86%) was observed when both ERB (extracellular respiratory bacteria) and conductive minerals were presence than those with only minerals (<10%) or ERB (<55%), indicating a synergistic effect existed in this bio-remediation system. Moreover, surface elements detection manifested higher Fe-containing groups and Fe(III)-Cr(III) complexes covered on conductive minerals surface when ERB was present. Electrochemical data suggested that ERB facilitated the activity of electron transference on the surface of conductive minerals. Our results indicated that conductive minerals did act as an “electron shuttle” while insulative minerals increased adsorption sites to accelerate Cr(VI) reduction. 16S rRNA sequences results demonstrated that conductive minerals changed the microbial community structure and increased the diversity of the functional microbes includingPseudomonasspp. andExiguobacteriumspp. This work is of deep significance for better understanding the process of elements biogeochemical and elimination of pollutants.
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