title: Biochar as an electron shuttle for reductive dechlorination of pentachlorophenol by Geobacter sulfurreducens.
abstract: The reductive dechlorination of pentachlorophenol (PCP) by Geobacter sulfurreducens in the presence of different biochars was investigated to understand how biochars affect the bioreduction of environmental contaminants. The results indicated that biochars significantly accelerate electron transfer from cells to PCP, thus enhancing reductive dechlorination. The promotion effects of biochar (as high as 24-fold) in this process depend on its electron exchange capacity (EEC) and electrical conductivity (EC). A kinetic model revealed that the surface redox-active moieties (RAMs) and EC of biochar (900 °C) contributed to 56% and 41% of the biodegradation rate, respectively. This work demonstrates that biochars are efficient electron mediators for the dechlorination of PCP and that both the EC and RAMs of biochars play important roles in the electron transfer process.
authors.affiliation: Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.|Graduate University of Chinese Academy of Sciences, Beijing 100039, China.|Guangdong Institute of Eco-environmental and Soil Sciences, Guangzhou, 510640, China.
authors.forename: Linpeng
authors.initials: L
authors.lastname: Yu
authors.affiliation: Guangdong Institute of Eco-environmental and Soil Sciences, Guangzhou, 510640, China.|Guangdong Key Laboratory of Agricultural Environment Management, Guangzhou, 510640, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Yuan
authors.affiliation: Guangdong Institute of Eco-environmental and Soil Sciences, Guangzhou, 510640, China.|Guangdong Key Laboratory of Agricultural Environment Management, Guangzhou, 510640, China.
authors.forename: Jia
authors.initials: J
authors.lastname: Tang
authors.affiliation: Guangdong Institute of Eco-environmental and Soil Sciences, Guangzhou, 510640, China.|Guangdong Key Laboratory of Agricultural Environment Management, Guangzhou, 510640, China.
authors.forename: Yueqiang
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Guangdong Institute of Eco-environmental and Soil Sciences, Guangzhou, 510640, China.|Guangdong Key Laboratory of Agricultural Environment Management, Guangzhou, 510640, China.
authors.forename: Shungui
authors.initials: S
authors.lastname: Zhou
mesh_terms: D001673:Biodegradation, Environmental; D002606:Charcoal / Q000737:chemistry*; D002713:Chlorine / Q000737:chemistry; D004553:Electric Conductivity; D004579:Electron Transport; D004583:Electrons; D004785:Environmental Pollutants / Q000737:chemistry*; D045302:Geobacter / Q000737:chemistry* / Q000502:physiology; D006801:Humans; D007700:Kinetics; D008956:Models, Chemical; D010084:Oxidation-Reduction; D010416:Pentachlorophenol / Q000737:chemistry*
chemical_list: D004785:Environmental Pollutants; C540010:biochar; D002606:Charcoal; D002713:Chlorine; D010416:Pentachlorophenol