Figure 1 | Scientific Reports

Figure 1

From: Retention Mechanisms of Citric Acid in Ternary Kaolinite-Fe(III)-Citrate Acid Systems Using Fe K-edge EXAFS and L3,2-edge XANES Spectroscopy

Figure 1

EXAFS spectroscopic analysis of Fe speciation in selected sorption samples from the kaolinite-Fe(III)-citrate system: k3-weighted Fe K-edge EXAFS spectra.

(a) The Fourier transform magnitude of S9 (b) and S0 (c). S0, S3 to S6 and S9 represent sorption samples without CA addition and with the ratio of Fe/citrate acid as 2, 1, 0.5, 0.25 and 0.05, respectively. Red and blue dotted lines represent the results obtained from shell-fitting and linear combination fitting, respectively. Peak features of interest are labeled by numbers 1 to 4.

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