Self-assembled FeS-Clostridium ljungdahlii biohybrid boost chemicals production in microbial electrosynthesis.
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| Title: | Self-assembled FeS-Clostridium ljungdahlii biohybrid boost chemicals production in microbial electrosynthesis. |
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| Authors: | Qiu, Yijing1,2 (AUTHOR), Cheng, Caiyun1,2 (AUTHOR), Song, Tianshun1,2 (AUTHOR) tshsong@njtech.edu.cn, Li, Xiang Ling1,2 (AUTHOR), Xie, Jingjing1,2,3 (AUTHOR) xiej@njtech.edu.cn |
| Source: | Bioresource Technology. Aug2026, Vol. 453, pN.PAG-N.PAG. 1p. |
| Subjects: | Clostridium, Carbon dioxide reduction, Nanoparticles, Chemical products manufacturing, Bioelectronics, Oxidation-reduction reaction, Electrocatalysis, Carbon fixation |
| Abstract: | [Display omitted] • A biologically self-assembled FeS accelerate electron transfer for C. ljungdahlii. • Acetate, butyrate, and 2,3-butanediol yields increased 10.5-, 2.63-, and 4.23-fold. • 1.01 g L−1 d−1 acetate yield was obtained in MES with C. ljungdahlii -CdS biohybrid. • The biohybrid drastically raises DET contribution to 78% • The genes related to carbon fixation, electron transfer and energy conservation were activated. The low extracellular electron transfer rate of Clostridium ljungdahlii limits its capacity to acquire reducing power from the electrode for CO 2 reduction and chemical synthesis. Herein, we employ a biologically self-assembled FeS construct to accelerate electron transfer for C. ljungdahlii , which enhances CO 2 -to-chemical conversion in microbial electrosynthesis (MES). The synthesized FeS nanoparticles were localized to the cell surface and intracellular space of C. ljungdahlii , thereby establishing a contiguous, bio-derived conductive network across the cellular boundary. The enhanced electron uptake capability drove a dramatic improvement in CO 2 reduction, increasing the yields of acetate, butyrate, and 2,3-butanediol by up to 10.5‑fold, 2.63‑fold, and 4.23‑fold, respectively. The biohybrid system achieved an impressive acetate yield of 1.01 g L−1 d−1 in long-term operation. The enhancement in chemicals synthesis within the Clostridium ljungdahlii -FeS biohybrid is attributed to the increased NADH/NAD+ ratio and electron transfer rate as well as the up-regulation of genes involved in carbon fixation, electron transfer, and energy conversion. This biohybrid structure dramatically elevated the direct electron transfer ratio of C. ljungdahlii from 18% to 78%, thereby reducing reliance on dissolved H 2. This work provides an efficient, light-independent strategy for augmenting CO 2 -to-chemical conversion via enhanced direct electron transfer in MES. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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