期刊
WATER RESEARCH
卷 218, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2022.118465
关键词
Semi-biological system; Bio-denitrification; Carbon nitride; Nitrate Metabolism
资金
- National Natural Science Foundation of China [51925807, 52192683]
- National Key R&D Program of China [2019YFC0408400, 2019YFC1907600]
This study investigates the effect of surface engineered carbon nitride on the denitrification capability of denitrifying bacteria. The research finds that carbon nitride modified with cobalt atoms and cyano groups can accelerate the bio-denitrification reaction and prevent the accumulation of harmful intermediates. Metabolomics and metatranscriptomic analysis further reveal the moderate metabolic adaptation and increased intracellular iron level as contributing factors.
Bio-denitrification plays a crucial role in the purification of nitrogen contaminated water, yet the low efficiency of the pure biological system often leads to the accumulation of harmful intermediates. Semi-biological catalysis provides an effective approach to improving the reaction efficiency through hybridizing artificial nanomaterials with natural organisms, yet the application of this strategy in bio-denitrification is limited. In this study, the effect of surface engineered carbon nitride on the denitrification capability of denitrifying bacteria was investigated. We found that cyano groups availed the biotic-abiotic interactions, while immobilized cobalt single atoms attenuated the local electrostatic repulsion. This synergistic effect endowed carbon nitride modified with cobalt atoms and cyano groups (Co/C3N4-C) with the unexpected acceleration of bio-denitrification reaction, without the accumulation of harmful intermediates. According to the metabolomics analysis, this improvement was attributed to the moderate metabolic adaptation caused by nanoelicitor, which induced dramatically boosted electron transfer and energy supply for extracellular polymeric substance (EPS) secretion. The elevation of intracellular iron level increased the activities of denitrification reductase, which was evidenced by metatranscriptomic analysis. Our results not only demonstrate the great potential of carbon nitride as an artificial elicitor for biological regulation, but also shed light on comprehending the complicated biotic-abiotic interactions for versatile application.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据