Fig. 4: Redox-active geopolymers accelerate Fe-bound organic carbon (OC–Fe) decomposition in anoxic conditions by acting as electron shuttles. | Nature Communications

Fig. 4: Redox-active geopolymers accelerate Fe-bound organic carbon (OC–Fe) decomposition in anoxic conditions by acting as electron shuttles.

From: Geopolymerization threatens the persistence of organic carbon associated with iron in anoxic environments

Fig. 4

a The impact of sediment HAs on the weighted average residence time (WMRT) of OC–Fe, the mean residence time (MRT) of OC–FeIM and OC–FeIM, and the relative abundance of dissimilatory iron reduction bacteria (DIRB). CK: anaerobic incubation of sediment, +HAs: anaerobic incubation of sediment with HAs supplementation. Box plots indicate median (middle line), mean (square symbol), 25th, 75th percentile (box), and 1.5 interquartile range (IQR, whiskers) as well as outliers (single points), n = 42 independent samples. The lines are connections between data points. b The mean 13CO2 production by decomposing CH313COOH -Fh in the incubation of Shewanella putrefaciens BMZ134712 with geopolymers or natural HAs addition. Error bars represent the standard deviation, n = 3 independent replicates. *p < 0.05; **p < 0.01; *** p < 0.001; ns, not significant (ANOVA). The schematic diagram illustrates the role of electron shuttles in accelerating electron transfer between the DIR strain and insoluble iron minerals.

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