Enhanced Removal of Typical Perfluoroalkyl Substance by Feammox Process in Aquatic Sediment: Effect of Electron Shuttles

2022 ◽  
Author(s):  
Yan Kang ◽  
Mei Li ◽  
Zizhang Guo ◽  
Ying Zhang ◽  
Weichao Li ◽  
...  
Keyword(s):  
Electron Shuttles ◽  
Aquatic Sediment

scholarly journals Laccases: Versatile Biocatalysts for the Synthesis of Heterocyclic Cores

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3719
Author(s):  
Ana Catarina Sousa ◽  
Lígia O. Martins ◽  
M. Paula Robalo
Keyword(s):  
Membered Ring ◽  
Low Molecular Weight ◽  
Redox Potentials ◽  
Redox Mediators ◽  
Multicopper Oxidases ◽  
Phenothiazine Derivatives ◽  
Ph Values ◽  
Electron Shuttles ◽  
Specific Oxidation ◽  
Optimal Ph

Laccases are multicopper oxidases that have shown a great potential in various biotechnological and green chemistry processes mainly due to their high relative non-specific oxidation of phenols, arylamines and some inorganic metals, and their high redox potentials that can span from 500 to 800 mV vs. SHE. Other advantages of laccases include the use of readily available oxygen as a second substrate, the formation of water as a side-product and no requirement for cofactors. Importantly, addition of low-molecular-weight redox mediators that act as electron shuttles, promoting the oxidation of complex bulky substrates and/or of higher redox potential than the enzymes themselves, can further expand their substrate scope, in the so-called laccase-mediated systems (LMS). Laccase bioprocesses can be designed for efficiency at both acidic and basic conditions since it is known that fungal and bacterial laccases exhibit distinct optimal pH values for the similar phenolic and aromatic amines. This review covers studies on the synthesis of five- and six-membered ring heterocyclic cores, such as benzimidazoles, benzofurans, benzothiazoles, quinazoline and quinazolinone, phenazine, phenoxazine, phenoxazinone and phenothiazine derivatives. The enzymes used and the reaction protocols are briefly outlined, and the mechanistic pathways described.

Electron shuttles enhance anaerobic oxidation of methane coupled to iron(III) reduction

2019 ◽  
Vol 688 ◽  
pp. 664-672 ◽  
Author(s):  
Qiuxiang He ◽  
Linpeng Yu ◽  
Jibing Li ◽  
Dan He ◽  
Xixi Cai ◽  
...  
Keyword(s):  
Anaerobic Oxidation Of Methane ◽  
Anaerobic Oxidation ◽  
Electron Shuttles ◽  
Oxidation Of Methane

Respiration and aeration by bioturbating Tubificidae alter biogeochemical processes in aquatic sediment

2018 ◽  
Vol 81 (1) ◽  
Author(s):  
Rémon M. Saaltink ◽  
Eldin Honingh ◽  
Stefan C. Dekker ◽  
Jasper Griffioen ◽  
Mariëlle C. van Riel ◽  
...  
Keyword(s):  
Biogeochemical Processes ◽  
Aquatic Sediment

Dissolved organic matter modified magnetic carbon nanotubes enhance the bioremediation of azo dyes and Cr(vi)

2020 ◽  
Vol 6 (7) ◽  
pp. 1804-1815
Author(s):  
Caiwen He ◽  
Lipeng Gu ◽  
Huan He ◽  
Zhe Zhang ◽  
Xiaoxia Wang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Organic Matter ◽  
Water Treatment ◽  
Dissolved Organic Matter ◽  
Azo Dyes ◽  
Electron Shuttles ◽  
Magnetic Carbon ◽  
Magnetic Carbon Nanotubes

Dissolved organic matter and Fe(iii) species can serve as electron shuttles in the bioreduction of various pollutants in water treatment, but their residuals are also regarded as contaminants.

Optimizing electron transfer from CdSe QDs to hydrogenase for photocatalytic H2 production

2019 ◽  
Vol 55 (39) ◽  
pp. 5579-5582 ◽  
Author(s):  
Monica L. K. Sanchez ◽  
Chang-Hao Wu ◽  
Michael W. W. Adams ◽  
R. Brian Dyer
Keyword(s):  
Quantum Dots ◽  
Electron Transfer ◽  
Reduction Potential ◽  
H2 Production ◽  
Cdse Quantum Dots ◽  
Redox Mediators ◽  
Cdse Qds ◽  
Electron Shuttles ◽  
Hydrogenase Enzyme

A series of viologen related redox mediators of varying reduction potential has been characterized and their utility as electron shuttles between CdSe quantum dots and hydrogenase enzyme has been demonstrated.

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