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Title: Templating Growth of a Pseudomorphic Lepidocrocite Microshell at the Calcite–Water Interface

Journal Article · · Chemistry of Materials
ORCiD logo [1]; ORCiD logo [1];  [2];  [3]; ORCiD logo [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  3. Univ. of Delaware, Newark, DE (United States)
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The growth of lepidocrocite (Gamma-FeOOH) has been observed through oxidation of Fe(II) on calcite (CaCO3) surfaces. However, the structural relation between lepidocrocite and the underneath substrate is not fully resolved, which is essential to understand its growth mechanism. Here, we observed the formation of iron oxyhydroxide layers having distinct morphologies during the dissolution of calcite in acidic Fe(II)-rich solutions. A pseudomorphic lepidocrocite shell together with multiple iron oxyhydroxide layers encapsulated within the shell was imaged by optical and transmission X-ray microscopy. The presence of several nm thick ordered lepidocrocite films was resolved by X-ray reflectivity, with the lepidocrocite (100) plane oriented parallel to the calcite (104) surface normal direction. Lath-shaped lepidocrocite aggregates formed during the initial precipitation, and these eventually grew into clusters of parallel platy crystals. The formation of nanometer thick well-ordered lepidocrocite films on pristine calcite surfaces appears critical for the subsequent pseudomorphic growth. As a result, this growth mechanism yields the potential of using carbonate minerals as templates for pseudomorphic synthesis of iron oxyhydroxides in complex morphologies.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; SC0012704
OSTI ID:
1427507
Alternate ID(s):
OSTI ID: 1433994; OSTI ID: 1436257
Report Number(s):
BNL-203541-2018-JAAM; BNL-203608-2018-JAAM; 140950; TRN: US1802722
Journal Information:
Chemistry of Materials, Vol. 30, Issue 3; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

Figures / Tables (8)

Figure 1.(p. 2)figure Figure 1.
Figure 2.(p. 3)figure Figure 2.
Figure 3.(p. 4)figure Figure 3.
Figure 4.(p. 5)figure Figure 4.
Figure 5.(p. 6)figure Figure 5.
Figure 6.(p. 7)figure Figure 6.
Figure 7.(p. 8)figure Figure 7.
Figure 8.(p. 9)figure Figure 8.

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
25 ENERGY STORAGE
36 MATERIALS SCIENCE