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Effect of Zn coprecipitation on the structure of layered Mn oxides

Journal Article · · Chemical Geology
 [1];  [2];  [3];  [4];  [5];  [5];  [5];  [3];  [2];  [5]
  1. Georgia Inst. of Technology, Atlanta, GA (United States). School of Earth and Atmospheric Sciences
  2. Univ. of Wyoming, Laramie, WY (United States). Dept. of Ecosystem Science and Management
  3. Univ. of Houston, Houston, TX (United States). Dept. of Physics and Texas Center for Superconductivity
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  5. Georgia Inst. of Technology, Atlanta, GA (United States). School of Earth and Atmospheric Sciences
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Mn oxides (MnOx) are a group of ubiquitous metal oxides in the environment and can significantly affect the biogeochemical cycles of metals, nutrients, and contaminants. Due to their negative surface charge across a wide range of environmental conditions, metal cations have strong affinities for MnOx, and the presence of metal cations during or after the formation of MnOx might significantly affect their structure and reactivity. This study systematically investigates the effects of Zn2+ presence during mineral formation (i.e. coprecipitation) on the structure of acid birnessite and delta-MnO2, two synthetic analogs that are structurally similar to fresh biogenic MnOx but with different crystallinity. For both acid birnessite and delta-MnO2, Zn2+ existed as surface adsorbed species at vacancy sites, interrupted layer stacking along c axis, and caused reductions of the lateral particle size. Zn2+ also reduced Mn(III) contents in delta-MnO2 layers, leaving more vacancy sites (capped by adsorbed Zn2+). The reduction of layer stacking was more obvious for acid birnessite, while the modification of layer structure was more significant for delta-MnO2. These structural changes will likely lead to modified reactivity of MnOx in natural systems.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Aeronautic and Space Administration (NASA); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
Grant/Contract Number:
AC02-06CH11357; AC02-76SF00515
OSTI ID:
1483988
Alternate ID(s):
OSTI ID: 1703121
Journal Information:
Chemical Geology, Journal Name: Chemical Geology Vol. 493; ISSN 0009-2541
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

Figures / Tables (7)

Table 1(p. 28)table Table 1
Table 2(p. 29)table Table 2
Figure 1(p. 30)figure Figure 1
Figure 2(p. 31)figure Figure 2
Figure 3(p. 32)figure Figure 3
Figure 4(p. 33)figure Figure 4
Figure 5(p. 34)figure Figure 5

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Related Subjects

36 MATERIALS SCIENCE
58 GEOSCIENCES
Birnessite
Coprecipitation
Manganese oxide
Structure
Zinc