舍瓦内拉
化学
电子转移
电子传输链
纳米技术
胞外聚合物
希瓦氏菌属
化学工程
材料科学
光化学
生物膜
细菌
生物化学
遗传学
生物
工程类
作者
Jian Li,Rui Wang,Jing Zhang,Honghui Wang,Chongyuan Zhao,Lielin Shu,Peng Huang,Yejing Xu,Zhiying Yan,Randy A. Dahlgren,Zheng Chen
出处
期刊:Chemosphere
[Elsevier]
日期:2022-11-01
卷期号:307: 135980-135980
被引量:5
标识
DOI:10.1016/j.chemosphere.2022.135980
摘要
A novel photosensitized living biohybrid was fabricated by inward-to-outward assembly of amine-functionalized carbon dots (NCDs) and polydopamine (PDA) to Shewanella oneidensis MR-1 and applied for high-efficiency, microbial-photoreduction of Cr(VI). Within a 72 h test period, biohybrids achieved a pronounced catalytic reduction capacity (100%) for 100 mg/L Cr(VI) under visible illumination, greatly surpassing the poor capacity (only 2.5%) displayed by the wild strain under dark conditions. Modular configurations of NCDs and PDA afforded biohybrids with a large electron flux by harvesting extracellular photoelectrons generated from illuminated NCDs and increasing reducing equivalents released from an enlarged intracellular NADH/NAD+ pool. Further, increased production of intracellular c-type cytochromes and extracellular flavins resulting from the modular configuration enhanced the biohybrid electron transport ability. The enhancement of electron transport was also attributed to more conductive conduits at NCDs-PDA junction interfaces. Moreover, because NCDs are highly reductive, the enhanced Cr(VI) reduction was also attributed to direct reduction by the NCDs and the direct Cr(VI) reduction by sterile NCDs-assembled biohybrid was up to 20% in the dark. Overall, a highly efficient strategy for removal/transformation of Cr(VI) by using NCD-assembled photosensitized biohybrids was proposed in this work, which greatly exceeded the performance of Cr(VI)-remediation strategies based on conventional microbial technologies.
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