The mechanism of carbon quantum dots to regulate the reduction of 2,2’-dinitrobiphenyl by Shewanella
WANG He-fei1,2, SHEN Ke2, ZHANG Wen-kang2, SONG Yao2, REN Chong-fei2, YANG Chen2, GAO Yan-zheng2
1. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China; 2. College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
摘要Shewanella, which is widely presented in soil, can reductively transform a variety of pollutants through extracellular electron transport pathways. Carbon quantum dots (CQDs) were produced from biochar through oxidation by nitric acid, and the the effectiveness and mechanism of CQDs to regulate the reduction of 2,2’-dinitrobiphenyl by the model microorganism(S. oneidensis MR-1) were studied. The produced CQDs were spherical with a particle size of 1.5~4nm, and the surface was rich in oxygen-containing functional groups, which were active for electron transfer. Mtr pathway was the main electron transport pathway for the reduction of 2,2’-dinitrobiphenyl by S. oneidensis MR-1, and SirCD was also involved in the reduction. CQDs can promote the electron transport in the reduction of 2,2’-dinitrobiphenyl by S. oneidensis MR-1, decrease the toxic effect of the pollutants on bacteria, thus improving the reduction efficiency. Goethite prevented reduction of 2,2’-dinitrobiphenyl by S. oneidensis MR-1, which can be alleviated by CQDs. Humic acid and CQDs promoted the reduction of 2,2’-dinitrobiphenyl by S. oneidensis MR-1.
Abstract：Shewanella, which is widely presented in soil, can reductively transform a variety of pollutants through extracellular electron transport pathways. Carbon quantum dots (CQDs) were produced from biochar through oxidation by nitric acid, and the the effectiveness and mechanism of CQDs to regulate the reduction of 2,2’-dinitrobiphenyl by the model microorganism (S. oneidensis MR-1) were studied. The produced CQDs were spherical with a particle size of 1.5~4nm, and the surface was rich in oxygen-containing functional groups, which were active for electron transfer. Mtr pathway was the main electron transport pathway for the reduction of 2,2’-dinitrobiphenyl by S. oneidensis MR-1, and SirCD was also involved in the reduction. CQDs can promote the electron transport in the reduction of 2,2’-dinitrobiphenyl by S. oneidensis MR-1, decrease the toxic effect of the pollutants on bacteria, thus improving the reduction efficiency. Goethite prevented reduction of 2,2’-dinitrobiphenyl by S. oneidensis MR-1, which can be alleviated by CQDs. Humic acid and CQDs promoted the reduction of 2,2’-dinitrobiphenyl by S. oneidensis MR-1.
王贺飞, 沈可, 张文康, 宋瑶, 任冲飞, 杨晨, 高彦征. 碳量子点调控希瓦氏菌还原二硝基联苯的机制[J]. 中国环境科学, 2024, 44(11): 6418-6425.
WANG He-fei, SHEN Ke, ZHANG Wen-kang, SONG Yao, REN Chong-fei, YANG Chen, GAO Yan-zheng. The mechanism of carbon quantum dots to regulate the reduction of 2,2’-dinitrobiphenyl by Shewanella. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(11): 6418-6425.
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