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Enhanced arsenic removal by hydrothermally treated nanocrystalline Mg/Al layered double hydroxide with nitrate intercalation.

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Enhanced arsenic removal by hydrothermally treated nanocrystalline Mg/Al layered double hydroxide with nitrate intercalation.

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dc.contributor.author Goh, Kok Hui.
dc.contributor.author Lim, Teik-Thye.
dc.contributor.author Dong, Zhili.
dc.date.accessioned 2011-12-20T03:48:17Z
dc.date.available 2011-12-20T03:48:17Z
dc.date.copyright 2009
dc.date.issued 2011-12-20
dc.identifier.citation Goh, K. H., Lim, T. T., & Dong, Z. (2009). Enhanced Arsenic Removal by Hydrothermally Treated Nanocrystalline Mg/Al Layered Double Hydroxide with Nitrate Intercalation. Environmental Science and Technology, 43 (7), 2537–2543.
dc.identifier.uri http://hdl.handle.net/10220/7423
dc.description.abstract A nanocrystalline Mg/Al layered double hydroxide (FCHT-LDH) adsorbent was developed and investigated through stoichiometric calculations, nitrate displacement investigation, comprehensive sorption/desorption experiments, and analyses with XPS, XRD, FTIR, CHNS/O, and EDX for better understanding of the predominant nature of arsenate (As(V)) interaction with FCHT-LDH. FCHT-LDH demonstrated a higher sorption capacity and a faster sorption rate compared to the layered double hydroxides (LDHs) prepared by conventional methods, due to its higher surface area, better porosity characteristics, and nanocrystalline property. These results also indicated the important role of hydrothermal treatment during the synthesis process for enhanced As(V) removal. The observed nitrate−arsenate molar displacement ratio, increased interlayer spacing, and decreased nitrogen content in the interlayer region revealed the predominance of anion exchange mechanism in As(V) sorption by FCHT-LDH. However, a slight pH increase during As(V) sorption equalization and the presence of ca. 25% irreversibly sorbed As(V) signified the occurrence of ligand exchange process as the secondary sorption mechanism. This specific sorption process that possibly involved formation of inner-sphere As(V) complexes with a monodentate mononuclear configuration at the aluminum center, rendered the FCHT-LDH a high affinity for As(V) over nitrate but induced hysteretic sorption/desorption characteristic that limited its regenerated sorption capacity.
dc.language.iso en
dc.relation.ispartofseries Environmental science and technology
dc.rights © 2009 American Chemical Society
dc.subject DRNTU::Engineering::Materials::Ecomaterials.
dc.subject DRNTU::Engineering::Environmental engineering::Water treatment.
dc.title Enhanced arsenic removal by hydrothermally treated nanocrystalline Mg/Al layered double hydroxide with nitrate intercalation.
dc.type Journal Article
dc.contributor.school School of Materials Science and Engineering
dc.identifier.doi http://dx.doi.org/10.1021/es802811n

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