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

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APPENDIX GINTRAPARTICLE DIFFUSION MODELINGVBA code in Excel for estimating experimental surface diffusivity is listed below.Option ExplicitOption Base 1Function IntraDiff(mg1 As Range, rng2 As Range) As IntegerConst fPi As Double = 3.14159265358979Const fDay2Hour As Double = 24#Const fMum2Cm As Double = 0.0001Const fTol As Double = 0.0001IntraDiff = 0If mgl.Columns.Count 2 Or rngl.Rows.Count < 2 ThenMsgBox "Wrong Pore size distribution data!"IntraDiff = 1Exit FunctionEnd IfIf rng2.Columns.Count 2 Or rng2.Rows.Count < 2 ThenMsgBox "Wrong CBC data!"IntraDiff = 2Exit FunctionEnd IfDim i As Integer, j As Integer, iCs As IntegerDim nPSD As Integer, nCBC As IntegerDim fRad() As Double, fVol() As Double, fMass() As DoubleDim fTime() As Double, fSorbExp() As DoubleDim fSorbPred() As DoublenPSD = rngl.Rows.CountnCBC = mg2.Rows.CountReDim fRad(nPSD), fVol(nPSD), fMass(nPSD)ReDim fTime(nCBC), fSorbExp(nCBC)ReDim fSorbPred(nCBC)For i = 1 To nPSDfRad(i) = mgl.Cells(i, 1) * 0.5 * fMum2CmfVol(i) = mg1 .Cells(i, 2) / 100#178
179Next iFor i = 1 To nCBCfTime(i) = rng2.Cells(i, 1) * fDay2HourfSorbExp(i) = rng2.Cells(i, 2)Next iDim fE As DoubleDim fS As DoubleDim fKd As DoubleDim fDen As DoubleDim fDsO As DoublefE = Range("C5")fDen = Range("C6")IS = Range("C7")fKd = Range("C8")fDsO = Range("C9") * 3600#Dim fKi. As Double, ID As Double, fA As Double, fCs As Double, fDs As DoubleDim fSuml As Double, fSum2 As Double, flnfSeries As DoubleDim fDiffl As Double, fDiff2 As Double, Wet As Double, fPerSum As DoubleDim fVar As Double, fAveEr As DoubleDim fMinVar As DoubleDim flter As DoublefMinVar = 1#fKi = fE * fKd / (1# - fE)fCs = IS * fKdFor iCs = 0 To 89fDs = fDsO * (1 + iCs / 10#)fD = fDs / (1# + fE / (fDen * 1000# * fKi))fSuml = 0#fSum2 = 0#fPerSum = 0#For i = 1 To nCBCfSorbPred(i) = 0#For j = 1 To nPSDfInfSeries = 0#flter = 1#
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Copyright Warning & RestrictionsThe
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ABSTRACTHEAVY METAL ADSORPTION ON I
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HEAVY METAL ADSORPTION ON IRON OXID
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APPROVAL PAGEHEAVY METAL ADSORPTION
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Fan, M.; Boonfueng, T.; Xu, Y.; Axe
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ACKNOWLEDGMENTI would like to expre
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TABLE OF CONTENTS(Continued)Chapter
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TABLE OF CONTENTS(Continued)Chapter
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LIST OF TABLES(Continued)TablePageB
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LIST OF FIGURES(Continued)FigurePag
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LIST OF FIGURES(Continued)FigurePag
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CHAPTER 1INTRODUCTIONHeavy<
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3and Sigg, 1992; Gunneriusson et al
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CHAPTER 2OXIDES AND THEIR EFFECT ON
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7et al. 1996; Green-Pedersen et al.
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9identify components, distribution,
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11oxides. Because extraction method
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13Table 2.2 Some Coating Work and C
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15increasing the sorbate concentrat
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17mole Cu g-1 goethite (-1-7% of th
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19Overall, macroscopic adso
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21hematite (up to 9.9 limo' Pb ril-
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23concentration in their system was
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25Surface complexation modeling (SC
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27Overall, surface complexation mod
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29Spectroscopic techniques, especia
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31• Understand the effect of comp
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33existing in almost all soils and
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CHAPTER 4EXPERIMENTAL METHODSIn thi
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37included coating temperature (T),
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39generated at 45 kV and 40 mA, sca
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41PZC include electrophoretic mobil
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43Lin-edge, from 8,133 to 8,884 eV
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CHAPTER 5CHARACTERIZATION OF IRON O
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47measured by potentiometric titrat
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Table 5.2 XRD Data of Alfa Aesar (A
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51Table 5.3 XRF Results for Alfa Ae
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Figure 5.4 Particle size distributi
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55Figure 5.5 ESEM micrograph for Al
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585.2.5 Surface Charge Distribution
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Figure 5.10 Potentiometric titratio
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CHAPTER 6SYNTHESIS AND CHARACTERIZA
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Figure 6.1 Comparison between Fecon
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Figure 6.2 XRD patterns for goethit
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68iron oxide coatings at 60 °C, go
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70substrate diameter of 0.2 mm, an
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72goethite and silica results in on
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Figure 6.7 ESEM micrograph (9000x)
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76Furthermore, because discrete goe
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78Table 6.2 Surface Area and Porosi
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Figure 6.10 Surface charge distribu
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Figure 6.11 Ni adsorption</
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84that for pure silica, and the goe
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Table 7.1 Sample Preparation Condit
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Figure 7.2 EXAFS spectra of Pb/HFO
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Figure 7.3 Fourier transform and fi
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Figure 7.4 Fourier transform and fi
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Table 7.3 EXAFS Results of Pb/HFO S
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967.2 Fe XAS of Iron Oxides and Pb/
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Figure 7.7 EXAFS spectra of iron ox
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100and Venturelli, 1999). Overall t
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102(hematite, goethite, akaganeite,
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104adsorption proc
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106of pH, ionic strength, Pb loadin
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Figure 8.1 Ni adsorption</s
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110high metal load
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Figure 8.3 x(k)•k3 spectra and Fo
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Figure 8.4 (k)•k3 spectra of Ni-H
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Figure 8.5 Fourier transforms (magn
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118be fit using either Fe or Ni ato
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1208.3 EXAFS Analysis of FeThe x(k)
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Table 8.4 EXAFS Results of HFO and
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CHAPTER 9SURFACE COMPLEXATION MODEL
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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 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
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