Bifunctional sludge-derived redox carbon dots with photoelectron storage and delivery properties for ammonia production by photosensitized Shewanella oneidensis MR-1

IF 9.7 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology Pub Date : 2024-09-26 DOI:10.1016/j.biortech.2024.131539

Qiansheng Li , Hong Lu , Tian Tian , Haikun Zhang , Fanghao Cheng , Xiaoman Li , Haocheng Sun , Xuehai Wang , Jiti Zhou

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Abstract

Combining the light-harvesting capabilities of photosensitizers with microbial catalysis shows great potential in solar-driven biomanufacturing. However, little information is available about the effects of photosensitizers on the photoelectron transport during the dissimilatory nitrate reduction to ammonium (DNRA) process. Herein, redox carbon dots (CDs-500) were prepared from sludge via the pyrolysis-Fenton reaction and then used to construct a photosynthetic system with Shewanella oneidensis MR-1. The MR-1/CDs-500 photosynthetic system showed a 5.9-fold increase in ammonia production (4.9 mmol(NH₃)·g⁻¹(protein)·h⁻¹) with a high selectivity of 94.0 %. The photoelectrons were found to be stored in CDs-500 and transferred into the cells. During the inward electron transport, the intracellular CDs-500 could be used as the direct photoelectron transfer stations between outer membrane cytochrome c and DNRA-related enzymes without the involvement of CymA and MtrA. This work provides a new method for converting waste into functional catalysts and increases solar-driven NH₃ production to a greater extent.

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具有光电子存储和传输特性的双功能污泥衍生氧化还原碳点用于光敏化 Shewanella oneidensis MR-1 的氨生产

将光敏剂的光收集能力与微生物催化作用相结合，在太阳能驱动的生物制造方面显示出巨大的潜力。然而，关于光敏剂在硝酸盐异纤还原成铵（DNRA）过程中对光电子传输的影响的信息却很少。本文通过热解-Fenton 反应从污泥中制备出氧化还原碳点（CDs-500），然后将其用于与 Shewanella oneidensis MR-1 构建光合作用系统。MR-1/CDs-500 光合作用系统的氨生产量增加了 5.9 倍（4.9 mmol(NH3)-g-1(蛋白质)-h-1），选择性高达 94.0%。研究发现，光电子储存在 CDs-500 中，并转移到细胞中。在电子内向传输过程中，细胞内的 CDs-500 可作为外膜细胞色素 c 与 DNRA 相关酶之间的直接光电子传输站，而无需 CymA 和 MtrA 的参与。这项工作提供了一种将废物转化为功能催化剂的新方法，并在更大程度上提高了太阳能驱动的 NH3 产量。

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来源期刊

Bioresource Technology 工程技术-能源与燃料

CiteScore

20.80

自引率

19.30%

发文量

2013

审稿时长

12 days

期刊介绍： Bioresource Technology publishes original articles, review articles, case studies, and short communications covering the fundamentals, applications, and management of bioresource technology. The journal seeks to advance and disseminate knowledge across various areas related to biomass, biological waste treatment, bioenergy, biotransformations, bioresource systems analysis, and associated conversion or production technologies. Topics include: • Biofuels: liquid and gaseous biofuels production, modeling and economics • Bioprocesses and bioproducts: biocatalysis and fermentations • Biomass and feedstocks utilization: bioconversion of agro-industrial residues • Environmental protection: biological waste treatment • Thermochemical conversion of biomass: combustion, pyrolysis, gasification, catalysis.