A multi-scale assessmentf Pb(II) sorptionnolomite
Lee, S; Dyer, JA; Sparks, DL; Scrivner, NC; Elzinga, EJ
HERO ID
165544
Reference Type
Journal Article
Year
2006
Language
English
PMID
| HERO ID | 165544 |
|---|---|
| In Press | No |
| Year | 2006 |
| Title | A multi-scale assessmentf Pb(II) sorptionnolomite |
| Authors | Lee, S; Dyer, JA; Sparks, DL; Scrivner, NC; Elzinga, EJ |
| Journal | Journal of Colloid and Interface Science |
| Volume | 298 |
| Issue | 1 |
| Page Numbers | 20-30 |
| Abstract | Macroscopic sorption studiesndicated that Pb sorption capacity wasndependentf pHver the pH range 5-7, while sorption as a functionf reaction time up to two weeks for systems with no bulk precipitate phases showed continuous Pb uptakenolomite. This could beue toiffusionf Pbnto the microporesfolomite as well as anncreasen surface sites caused by particle size reductionuring suspension mixing. Normalized XANES spectra for systems undersaturated with respect to Pb carbonate precipitates resembled the spectrumf Pb4(OH)4(4+), suggesting that Pbs mainly coordinated toolomite as annner-sphere surface complex. On thether hand, the XANES spectrum for 10(-3) M Pb at 1 atm CO2(g)n a 2 M Mg(NO3)2 background electrolyte solution resembled thatf cerussite, while a sample at 5 x 10(-4) M Pbn equilibrium with air and 2 M Mg(NO3)2 resembled thatf hydrocerussite. EXAFS analysesf sorption samplesn chloride solutions showed that there werenly first-shell contributions under 1 atm CO2(g), while higher shell contributions from Ca/Mg were seen at 10(-3.42) atm CO2(g). On thether hand, EXAFS samples preparedn nitrate solutions showed noticeableifferencesn speciation underifferent reaction conditions-fromuter-sphere surface complexes at low Pb concentrations and pH, tonner-sphere surface complexes at moderate Pb concentrations and neutral pH, to the formationf Pb carbonate precipitates at the highest Pb loadings. |
| Doi | 10.1016/j.jcis.2005.12.022 |
| Pmid | 16413566 |
| Wosid | WOS:000237399600004 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Language Text | English |
| Is Qa | No |