Immobilization of mercury by pyrite (FeS2) |
| |
Authors: | Bower Julia Savage Kaye S Weinman Beth Barnett Mark O Hamilton William P Harper Willie F |
| |
Institution: | a Department of Civil Engineering, Auburn University, 238 Harbert Engineering Center, Auburn, AL 36849, USA b Department of Earth and Environmental Sciences, Vanderbilt University, 2301 Vanderbilt Place, Nashville, TN 37235, USA c Department of Civil and Environmental Engineering, Vanderbilt University, 2301 Vanderbilt Place, Nashville, TN 37235, USA |
| |
Abstract: | Elemental mercury (Hg0) is a metal with a number of atypical properties, which has resulted in its use in myriad anthropogenic processes. However, these same properties have also led to severe local subsurface contamination at many places where it has been used. As such, we studied the influence of various parameters on Hg(II) sorption onto pyrite (pH, time, Hg(II) concentration), a potential subsurface reactive barrier. Batch sorption studies revealed that total Hg(II) removal increases with both pH and time. X-ray absorption spectroscopy analysis showed that a transformation in the coordination environment at low pH occurred during aging over 2 weeks, to form an ordered monolayer of monodentate Hg-Cl complexes on pyrite. In column studies packed with pure quartz sand, the transport of Hg(II) was significantly retarded by the presence of a thin pyrite-sand reactive barrier, although dissolved oxygen inhibited Hg(II) sorption onto pyrite in the column. |
| |
Keywords: | Mercury Pyrite Remediation Sulfide |
本文献已被 ScienceDirect PubMed 等数据库收录! |
|