Chlorophyll as natural redox mediators for the denitrification process

Chlorophyll as natural redox mediators for the denitrification process
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叶绿素作为反硝化过程的天然氧化还原介质

DOI:
10.1016/j.ibiod.2020.104895
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发表时间:
2020-03
影响因子:
4.8
通讯作者:
Hou Yanan
Hou Yanan
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Lu Caicai;Xie Zhen;Guo Jianbo;Song Yuanyuan;Xing Yajuan;Han Yi;Li Haibo;Hou Yanan

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过量的氮素通常会导致富营养化和有害的藻类水华,导致大量的叶绿素产生。本研究探讨了利用叶绿素作为氧化还原介质进行反硝化作用。结果表明,0.02 mm的叶绿素(Chla)可使硝酸盐还原速率提高7.26倍,亚硝酸盐还原速率提高7.31倍。与对照系统相比,添加ChLA的反硝化系统的电子传递速率有所提高,循环伏安分析中的峰间距较小。在添加Chla的反硝化实验中,较低的稳定pH和较高的稳定ORP可能表明Chla影响了反硝化过程中的电子传递途径。序列批次实验表明,CHLA具有良好的重复使用性和生物催化效果。此外,叶片和提取的叶绿素也能促进反硝化作用。这项研究为叶绿素的应用提供了新的见解,并为现场富营养化的管理提供了一种潜在的策略。
Excessive nitrogen commonly leads to eutrophication and harmful algal blooms, causing a large amount of chlorophyll production. In this study the use of chlorophyll as redox mediator for denitrification was investigated. Results showed that the nitrate and nitrite reduction rates were enhanced 7.26-fold and 7.31-fold with 0.02 mM chlorophylla(Chla), respectively. Compared to the control system, the electron transfer rate of the Chla-supplemented denitrification system was improved, as demonstrated by a smaller peak separation in cyclic voltammetry analysis. The lower stable pH and higher stable ORP in the Chla-supplemented denitrification assay might suggest that Chlaaffected the electron transfer path in denitrification. A sequencing batch experiment showed good reusability and biocatalytic effects of Chla. Furthermore, the leaves and extracted chlorophyll can also enhance denitrification. This study provides new insight for the application of chlorophyll and a potential strategy for the management of eutrophicationin situ.
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