Heavy metal adsorption on iron oxide and iron oxide-coated silica ...
Heavy metal adsorption on iron oxide and iron oxide-coated silica ...
Heavy metal adsorption on iron oxide and iron oxide-coated silica ...
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LIST OF FIGURES(C<strong>on</strong>tinued)FigurePage7.5 Fourier transform <strong>and</strong> fit of Pb/HFO <str<strong>on</strong>g>adsorpti<strong>on</strong></str<strong>on</strong>g> samples at pH 5 <strong>and</strong> 10-2i<strong>on</strong>ic strength as a functi<strong>on</strong> of time at Pb Lm edge. FT was performed overrange 2.8-9.5 A-1 , fitted over 0.45-3.58 A. 937.6 Fe K-edge 'CANES spectra of ir<strong>on</strong> <strong>oxide</strong>s. 977.7 EXAFS spectra of ir<strong>on</strong> <strong>oxide</strong>s <strong>and</strong> Pb/HFO samples at Fe K-edge. 987.8 Fourier transform <strong>and</strong> fit of Pb/HFO <str<strong>on</strong>g>adsorpti<strong>on</strong></str<strong>on</strong>g> samples at Fe K-edge. FTwas performed over range: hematite 2.83-11.42 Al , goethite 2.63-11.19 A l ,HFO <strong>and</strong> Pb-HFO sorpti<strong>on</strong> samples 2.86-11.77 A -1 997.9 Pb/HFO CBC study <strong>on</strong> 0.3g L -1 HFO at IS=1.4x10-2, pH=5, <strong>and</strong> [Pb] e=1x10-4M. Dashed lines represent the error (+ two st<strong>and</strong>ard deviati<strong>on</strong>) of the model 1038.1 Ni <str<strong>on</strong>g>adsorpti<strong>on</strong></str<strong>on</strong>g> edge <strong>on</strong> 1 g L -1 HFO at initial [Ni]o = 5x10 -9 M, NaNO3 basedelectrolyte, <strong>and</strong> 25 °C. 1088.2 Ni <str<strong>on</strong>g>adsorpti<strong>on</strong></str<strong>on</strong>g> isotherm <strong>on</strong> 1 g L -1 HFO as a functi<strong>on</strong> of pH at i<strong>on</strong>ic strength2.8x10-2 (NaNO3) <strong>and</strong> room temperature 1098.3 x(k)•k3 spectra of Ni st<strong>and</strong>ards <strong>and</strong> Ni-HFO sorpti<strong>on</strong> complexes as a functi<strong>on</strong>of pH, IS, <strong>and</strong> adsorbate loading studied at the Ni K-edge at roomtemperature. 1128.4 Fourier transforms (magnitude <strong>and</strong> imaginary part) of Ni K-edge XASspectra of Ni st<strong>and</strong>ards (Fourier transformed <strong>and</strong> fitted over ranges: NiO,2.5-10.99 A-1 <strong>and</strong> 0.73-3.18 A; NiCO3•nH20, 2.4-9.3 A 1 <strong>and</strong> 0.65-4.3 A;Ni2+ (aq), 2.36-9.27 A -1 <strong>and</strong> 0.27-2.23 A). 1148.5 Fourier transforms (magnitude <strong>and</strong> imaginary part) of Ni K-edge XAS spectraof Ni-HFO sorpti<strong>on</strong> complexes (Fourier transformed <strong>and</strong> fitted over ranges:2.4-9.3 A-1 <strong>and</strong> 0.84-3.80 A). 1168.6 x(k)•k3 spectra of HFO, Ni/HFO 5-day sorpti<strong>on</strong> sample, <strong>and</strong> coprecipitatedNi/HFO sample. 1219.1 Potentiometric titrati<strong>on</strong> of 1 g L -1 goethite in NaNO3-based electrolyte atroom temperature (lines represent TLM results using parameterscorresp<strong>on</strong>ding to ApKa = 1) . 126xvi