Heavy metal adsorption on iron oxide and iron oxide-coated silica ...

More documents

Recommendations

Info

84that for pure silica, and the goethite coating exhibited a larger capacity than the discretegoethite system. Both characterization and <strong>adsorption</strong> studies reveal that sub-micrometeriron oxide coatings are produced; these coatings significantly increased <strong>adsorption</strong>capacity impacting interactions at the aqueous interface.In the following chapters, mechanisms of heavy <strong>metal</strong> <strong>adsorption</strong> to iron oxide areinvestigated using XAS and are followed by surface complexation modeling and sorptionto coated silica.
CHAPTER 7SURFACE COMPLEXATION OF PB(II) ON AMORPHOUS IRON OXIDE:SPECTROSCOPIC AND TIME STUDIESAs discussed earlier in the hypothesis of this research, HFO is the precursor of goethite,and because they may have similar surface functional groups and surface structures,sorbed Pb(II) surface complexes are expected to be alike. This similarity was recentlydemonstrated in other studies (Manceau et al. 1992; Bargar et al. 1997b; Scheinost et al.2001; Trivedi et al. 2003) where mononuclear bidentate complexes to edges of FeO6 wereobserved. In this chapter, Pb/HFO sorption samples are analyzed with XAS. BecauseHFO is metastable and can transform into more crystalline form, Pb <strong>adsorption</strong> on HFOas a function of time is also studied and analyzed at both Pb L iii-edge and Fe K-edge.7.1 Pb EXAFS of Pb/HFO SamplesPb <strong>adsorption</strong> mechanisms on freshly precipitated HFO samples as a function of pH,ionic strength, Pb loading, and time have been studied (Table 7.1). The EXAFS spectracollected for Pb standards (PbO, PbCO3, and aqueous Pb(NO3)2) are compared toPb/HFO <strong>adsorption</strong> samples (Figure 7.1 and Figure 7.2). The x(k)•k 3 spectra of PbO andPbCO3 are similar to that observed by others (Bargar et al. 1997a; O'Day et al. 1998;Ostergren et al. 1999b) and the fitting results (Table 7.2) are consistent with XRD. Thex(k)•k3 spectra of aqueous Pb(NO3)2 solution is characterized by a backscatteringenvelope dominated by a first-shell of oxygen atoms around the central Pb atom (Figure7.1). The RSF clearly demonstrates this P13-O contribution showing one peak atapproximately 1.9 A (Figure 7.3), which was fitted with 6.97 + 0.43 O atoms at 2.5 ±85
Page 1 and 2:
Copyright Warning & RestrictionsThe
Page 3 and 4:
ABSTRACTHEAVY METAL ADSORPTION ON I
Page 5 and 6:
HEAVY METAL ADSORPTION ON IRON OXID
Page 7 and 8:
APPROVAL PAGEHEAVY METAL ADSORPTION
Page 9 and 10:
Fan, M.; Boonfueng, T.; Xu, Y.; Axe
Page 11 and 12:
ACKNOWLEDGMENTI would like to expre
Page 13 and 14:
TABLE OF CONTENTS(Continued)Chapter
Page 15 and 16:
TABLE OF CONTENTS(Continued)Chapter
Page 17 and 18:
LIST OF TABLES(Continued)TablePageB
Page 19 and 20:
LIST OF FIGURES(Continued)FigurePag
Page 21 and 22:
LIST OF FIGURES(Continued)FigurePag
Page 23 and 24:
CHAPTER 1INTRODUCTIONHeavy<
Page 25 and 26:
3and Sigg, 1992; Gunneriusson et al
Page 27 and 28:
CHAPTER 2OXIDES AND THEIR EFFECT ON
Page 29 and 30:
7et al. 1996; Green-Pedersen et al.
Page 31 and 32:
9identify components, distribution,
Page 33 and 34:
11oxides. Because extraction method
Page 35 and 36:
13Table 2.2 Some Coating Work and C
Page 37 and 38:
15increasing the sorbate concentrat
Page 39 and 40:
17mole Cu g-1 goethite (-1-7% of th
Page 41 and 42:
19Overall, macroscopic adso
Page 43 and 44:
21hematite (up to 9.9 limo' Pb ril-
Page 45 and 46:
23concentration in their system was
Page 47 and 48:
25Surface complexation modeling (SC
Page 49 and 50:
27Overall, surface complexation mod
Page 51 and 52:
29Spectroscopic techniques, especia
Page 53 and 54:
31• Understand the effect of comp
Page 55 and 56: 33existing in almost all soils and
Page 57 and 58: CHAPTER 4EXPERIMENTAL METHODSIn thi
Page 59 and 60: 37included coating temperature (T),
Page 61 and 62: 39generated at 45 kV and 40 mA, sca
Page 63 and 64: 41PZC include electrophoretic mobil
Page 65 and 66: 43Lin-edge, from 8,133 to 8,884 eV
Page 67 and 68: CHAPTER 5CHARACTERIZATION OF IRON O
Page 69 and 70: 47measured by potentiometric titrat
Page 71 and 72: Table 5.2 XRD Data of Alfa Aesar (A
Page 73 and 74: 51Table 5.3 XRF Results for Alfa Ae
Page 75 and 76: Figure 5.4 Particle size distributi
Page 77: 55Figure 5.5 ESEM micrograph for Al
Page 80 and 81: 585.2.5 Surface Charge Distribution
Page 82 and 83: Figure 5.10 Potentiometric titratio
Page 84 and 85: CHAPTER 6SYNTHESIS AND CHARACTERIZA
Page 86 and 87: Figure 6.1 Comparison between Fecon
Page 88 and 89: Figure 6.2 XRD patterns for goethit
Page 90 and 91: 68iron oxide coatings at 60 °C, go
Page 92 and 93: 70substrate diameter of 0.2 mm, an
Page 94 and 95: 72goethite and silica results in on
Page 96 and 97: Figure 6.7 ESEM micrograph (9000x)
Page 98 and 99: 76Furthermore, because discrete goe
Page 100 and 101: 78Table 6.2 Surface Area and Porosi
Page 102 and 103: Figure 6.10 Surface charge distribu
Page 104 and 105: Figure 6.11 Ni adsorption</
Page 108 and 109: Table 7.1 Sample Preparation Condit
Page 110 and 111: Figure 7.2 EXAFS spectra of Pb/HFO
Page 112 and 113: Figure 7.3 Fourier transform and fi
Page 114 and 115: Figure 7.4 Fourier transform and fi
Page 116 and 117: Table 7.3 EXAFS Results of Pb/HFO S
Page 118 and 119: 967.2 Fe XAS of Iron Oxides and Pb/
Page 120 and 121: Figure 7.7 EXAFS spectra of iron ox
Page 122 and 123: 100and Venturelli, 1999). Overall t
Page 124 and 125: 102(hematite, goethite, akaganeite,
Page 126 and 127: 104adsorption proc
Page 128 and 129: 106of pH, ionic strength, Pb loadin
Page 130 and 131: Figure 8.1 Ni adsorption</s
Page 132 and 133: 110high metal load
Page 134 and 135: Figure 8.3 x(k)•k3 spectra and Fo
Page 136 and 137: Figure 8.4 (k)•k3 spectra of Ni-H
Page 138 and 139: Figure 8.5 Fourier transforms (magn
Page 140 and 141: 118be fit using either Fe or Ni ato
Page 142 and 143: 1208.3 EXAFS Analysis of FeThe x(k)
Page 144 and 145: Table 8.4 EXAFS Results of HFO and
Page 146 and 147: CHAPTER 9SURFACE COMPLEXATION MODEL
Page 148 and 149: Figure 9.1 Potentiometric titration
Page 150 and 151: 128Table 9.1 Surface Reactions and
Page 152 and 153: Figure 9.2 Ni adsorption</s
Page 154 and 155: 132Table 9.2 Model Parameters for N
Page 156 and 157:
Figure 9.3 Ni adsorption</s
Page 158 and 159:
1369.3 Zn Adsorption on GoethiteReg
Page 160 and 161:
Figure 9.6 Zn adsorption</s
Page 162 and 163:
140data over a broad range of condi
Page 164 and 165:
142Figure 9.8 Ni adsorption
Page 166 and 167:
144oxide-coated silica. Ni and Zn s
Page 168 and 169:
Figure 10.1 Ni adsorption</
Page 170 and 171:
Figure 10.2 Zn adsorption</
Page 172 and 173:
Figure 10.4 Ni adsorption</
Page 174 and 175:
152one for GACS (2.77x10 -6 mole si
Page 176 and 177:
Figure 10.6 Zn adsorption</
Page 178 and 179:
CHAPTER 11CONCLUSIONS AND FUTURE WO
Page 180 and 181:
158surfaces are needed for successf
Page 182 and 183:
Figure A.2 Ni speciation in 1x10 -5
Page 184 and 185:
Figure A.4 Pb speciation in 5x10 -8
Page 186 and 187:
Figure A.6 Zn speciation in 1x10 -5
Page 188 and 189:
166Table B.2 Potentiometric Titrati
Page 190 and 191:
168Table BA Potentiometric Titratio
Page 192 and 193:
170Table C.3 Zn Adsorption Edges on
Page 194 and 195:
APPENDIX DADSORPTION STUDIES ON SIL
Page 196 and 197:
174Table D.5 Zn Adsorption Isotherm
Page 198 and 199:
176Table E.3 Pb CBC Study on 0.3 g
Page 200 and 201:
APPENDIX GINTRAPARTICLE DIFFUSION M
Page 202 and 203:
180DofA = flier ^ 2fA = Exp(-fD * f
Page 204 and 205:
REFERENCES1. Adamson A. W. (1982) P
Page 206 and 207:
18426. Blake R. L., Hessevick R. E.
Page 208 and 209:
18650. Combes J. M., Manceau A. and
Page 210 and 211:
18876. Elzinga E. J. and Sparks D.
Page 212 and 213:
190102. Gupta V. K. (1998) Equilibr
Page 214 and 215:
192126. Joshi A. and Chaudhuri M. (
Page 216 and 217:
194150. Liu C. and Huang P. M. (200
Page 218 and 219:
196175. Muller B. and Sigg L. (1992
Page 220 and 221:
200. Perry R. H. and Green D. W. (1
Page 222 and 223:
200226. Scheinost A. C., Kretzschma
Page 224 and 225:
202252. Swallow C. K., Hume D. N. a
Page 226 and 227:
204278. Villalobos M., Trotz M. A.
Page 228:
304. Zhong Z. Y., Prozorov T., Feln
show all

Heavy metal adsorption on iron oxide and iron oxide-coated silica ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?