Ecology

Data on Hydroxides Discussed by Researchers at Tohoku University

  2012 JUL 13 (VerticalNews) -- By a News Reporter-Staff News Editor at Ecology, Environment & Conservation -- Investigators publish new report on Hydroxides. According to news reporting originating in Miyagi, Japan, by VerticalNews journalists, researchers stated "Copper-aluminum layered double hydroxide intercalated with NO3- (NO3 center dot Cu-Al LDH) removed Sb(OH)(6)(-) [Sb(V)] in solution. The removal of antimony (Sb) increased with increasing NO3 center dot Cu-Al LDH, regardless of reaction time."

  The news reporters obtained a quote from the research by the authors from Tohoku University, "The pH increased from 4 to about 6, and then remained constant due to the buffering action of Cu2+. The removal of Sb by NO3 center dot Cu-Al LDH occurred due to anion exchange between Sb(V) (i.e., Sb(OH)(6)(-) in aqueous solution) and NO3- in the interlayer of Cu-Al LDH. Some Sb(OH)(6)(-) was likely adsorbed on the surface of NO3 center dot Cu-Al LDH. Conditions were difficult for intercalated OH- to contribute to anion exchange with Sb(OH)(6)(-). The removal efficiency of Sb decreased as follows: NO3 center dot Cu-Al LDH > Cl center dot Cu-Al LDH > CO3 center dot Cu-Al LDH > SO4 center dot Cu-Al LDH, regardless of reaction time. CO3 center dot Cu-Al LDH acted as an adsorbent for Sb(V) in aqueous solution. This reaction occurred around pH 6 when CO32- in the interlayer of Cu-Al LDH reacted with H+ to produce HCO3-. Therefore, HCO3- in the interlayer of Cu-Al LDH was exchanged with Sb(V) in aqueous solution."

  According to the news reporters, the researchers concluded: "Among four types of Cu-Al LDHs, NO3 center dot Cu-Al LDH was superior for the treatment of Sb(V)."

  For more information on this research see: Removal Of Antimonate Ions From Aqueous Solution Using Copper-aluminum Layered Double Hydroxide. Fresenius Environmental Bulletin, 2012;21(5A):1323-1328. Fresenius Environmental Bulletin can be contacted at: Parlar Scientific Publications (P S P), Angerstr. 12, 85354 Freising, Germany. (Parlar Scientific Publications - www.psp-parlar.de/; Fresenius Environmental Bulletin - www.psp-parlar.de/)

  Our news correspondents report that additional information may be obtained by contacting T. Kameda, Tohoku University, Grad Sch Environm Studies, Aoba Ku, Sendai, Miyagi 9808579, Japan.

  Keywords for this news article include: Asia, Japan, Miyagi, Anions, Alkalies, Aluminum, Hydroxides, Light Metals, Inorganic Chemicals

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