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Reaction Condition Effects on Nickel Sorption Mechanisms in Illite–Water Suspensions

^a Dep. of Plant and Soil Sciences, Univ. of Delaware, Newark, DE 19717-1303
^b Dep. of Geosciences, State Univ. of New York, Stony Brook, NY 11794-2100

View larger version (34K): [in a new window]   Fig. 1. The k3-weighted spectra of the samples analyzed extended x-ray absorption fine structure spectroscopy (EXAFS) in this study. The gray circle in Sample 2 locates the cut-off beat characteristic of Ni-Al LDH. is the Ni sorption density (in µmol m-2) calculated based on the ethylene glycol mono-ethyl ether (EGME) surface area; # indicates samples with drifting pH over time

View larger version (16K): [in a new window]   Fig. 2. Macroscopic data on the effect of pH control on Ni sorption to illite. The samples were reacted for 24 h at an ionic strength of 0.1 M. Filled datapoints were analyzed by extended x-ray absorption fine structure spectroscopy (EXAFS); the sample numbers correspond with those in Fig. 1 and 3

View larger version (26K): [in a new window]   Fig. 3. Radial structure funtions of the filled datapoints in Fig. 2. The solid lines represent the Fourier transforms of the measured spectra, and the dotted lines those of the theoretical spectra derived with parameters obtained from the fitting procedure. The radial structure functions are uncorrected for phase shift, and were obtained by Fourier transformation over . Sample numbers (in parentheses) correspond with those in Fig. 1 and 2

View larger version (16K): [in a new window]   Fig. 4. pH edges after 24 h and 8 d of reaction in a system with drifting pH over time. The arrows track the pH drift and Ni sorption of select samples with time

View larger version (15K): [in a new window]   Fig. 5. Macroscopic data on the effect of reaction time on Ni sorption. The samples were reacted at constant pH and an ionic strength of 0.1 M. Filled datapoints were analyzed by extended x-ray absorption fine structure spectroscopy (EXAFS); the sample numbers correspond with those in Fig. 1 and 6

View larger version (26K): [in a new window]   Fig. 6. Radial structure funtions RSFs (uncorrected for phase shift) of the filled datapoints in Fig. 5. Fourier transformation was performed over for all samples. The solid lines are the Fourier transforms of the measured spectra, and the dotted lines those of the theoretical spectra. The sample numbers in brackets correspond with those in Fig. 1 and 5

View larger version (16K): [in a new window]   Fig. 7. Macroscopic data on the effect of ionic strength on Ni sorption. The samples were reacted for 24 h at constant pH. Filled datapoints were analyzed by extended x-ray absorption fine structure spectroscopy (EXAFS); the sample numbers correspond with those in Fig. 1 and 8

View larger version (31K): [in a new window]   Fig. 8. Radial structure funtions (uncorrected for phase shift) of the filled datapoints in Fig. 7. Fourier transformation was performed over to 13.6 Å-1. The solid lines are the Fourier transforms of the measured spectra, and the dotted lines those of the theoretical spectra. The sample numbers in brackets correspond with those in Fig. 1 and 7