articleEnvironmental Science & TechnologyOct 28, 2014Closed access

Properties of Fe-Organic Matter Associations via Coprecipitation versus Adsorption

CCChunmei ChenJJJames J. DynesJWJian WangDLDonald L. Sparks

University of Delaware · Canadian Light Source (Canada) · +1 more institution

PubMed
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Abstract

The association of organic matter (OM) with minerals is recognized as the most important stabilization mechanism for soil organic matter. This study compared the properties of Fe-OM complexes formed from adsorption (reaction of OM to postsynthesis ferrihydrite) versus coprecipitation (formation of Fe solids in the presence of OM). Coprecipitates and adsorption complexes were synthesized using dissolved organic matter (DOM) extracts from a forest little layer at varying molar C/Fe ratios of 0.3-25.0. Sample properties were studied by N2 gas adsorption, XRD, FTIR, Fe EXAFS, and STXM-NEXAFS techniques. Coprecipitation resulted in much higher maximum C contents (∼130 mg g(-1) C difference) in the solid products…

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4

Topics & keywords

Topics
Keywords
  • Coprecipitation
  • Ferrihydrite
  • Adsorption
  • Chemistry
  • Extended X-ray absorption fine structure
  • XANES
  • Organic matter
  • Desorption
UN Sustainable Development Goals
  • Life in Land
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