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RESEARCH PRODUCT
Low-Molecular-Weight Organic Acid Complexation Affects Antimony(III) Adsorption by Granular Ferric Hydroxide.
Tatiana Y. ReichChuanyong JingXiaochen LiXiaochen LiMichael Kerstensubject
chemistry.chemical_classificationAntimonyExtended X-ray absorption fine structureInorganic chemistrychemistry.chemical_elementGeneral Chemistry010501 environmental sciencesHydrogen-Ion Concentration01 natural sciencesFerric Compoundschemistry.chemical_compoundAdsorptionOctahedronchemistryAntimonyTartaric acidEnvironmental ChemistryTitrationAdsorptionAbsorption (chemistry)0105 earth and related environmental sciencesOrganic aciddescription
Antimony(III) mobility in natural aquatic environments is generally enhanced by dissolved organic matter. Tartaric acid is often used to form complexes with and stabilize dissolved Sb(III) in adsorption studies. However, competition between such low-molecular-weight organic acid complexation and adsorption of Sb(III) has received little attention, which prompted us to measure Sb(III) adsorption by iron oxyhydroxide adsorbents commonly used in water treatment plants. Sb K-edge X-ray absorption fine structure (EXAFS) spectra gave Sb–O and Sb–Fe distances and coordinations compatible with a bidentate binuclear inner-sphere complex with trigonal Sb(O,OH)3 polyhedra sharing corners with Fe(O,OH)6 octahedra and a bidentate mononuclear inner-sphere complex but with Sb(O,OH)4 tetrahedra at alkaline pH. Experimental batch titration data were fitted using the charge-distribution multisite surface complexation (CD-MUSIC) model, constrained by the EXAFS molecular level information and taking competitive effects by th...
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-04-10 | Environmental sciencetechnology |