Chemoautotrophs, the crucial contributors to biological carbon fixation, derive energy from reducing specific inorganic substances and utilize CO2 for growth. However, the release of extracellular free organic carbon (EFOC) by chemoautotrophic microorganisms can inhibit their own growth and metabolism. To reduce the feedback inhibition effect, a low-release biochar (BC-LR) was applied to adsorb EFOC. BC-LR not only adsorbed EFOC, but also selectively adsorbed the main inhibitory component, low molecular weight organics, in EFOC. In contrast, ordinary biochar could not effectively adsorb EFOC and its addition inhibited microbial growth and CO2 fixation. In Transwell culture, BC-LR promoted microbial growth by 190% and CO2 fixation by 29%, and exhibited better economic advantage, when compared with granular activated carbon. These findings provide a novel insight into the interaction between biochar and autotrophic microbial metabolism, offering an economically feasible approach to mitigate feedback inhibition of metabolites and promoting biological CO2 fixation.

Xiaodi Zhao

Yundong Liu

Li Xie

Xiaohua Fu

Lei Wang

Min-Tian Gao

Jiajun Hu

Bioresource technology

BIORESOURCE TECHNOLOGY 发表关于生物资源技术的基础、应用和管理的原创文章、评论文章、案例研究和简短交流。该杂志旨在推进和传播生物质、生物废物处理、生物能源、生物转化和生物资源系统分析，以及与转化或生产相关的技术。

The journal "Bioresource Technology" publishes original research articles, reviews, case studies, and short communications on the fundamentals, applications, and management of bioresource technology. It aims to advance and disseminate research in biomass, biowaste treatment, bioenergy, bioconversion, and bioresource systems analysis, along with technologies related to conversion or production.

《Bioresource Technology》期刊发表关于生物资源技术的原创研究文章、评论、案例研究和简短交流。该期刊旨在推动和传播生物质、生物废物处理、生物能源、生物转化及生物资源系统分析等领域的研究，以及与这些转化或生产相关的技术。

Category	Quartile
环境科学与生态学	1
环境科学与生态学, 农业工程	1
环境科学与生态学, 生物工程与应用微生物	1
环境科学与生态学, 能源与燃料	1

Biochar promotes microbial CO2 fixation by regulating feedback inhibition of metabolites.

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Journal Info

Category	Quartile
ENERGY & FUELS	1