title: Removal of phosphate by aluminum oxide hydroxide.
abstract: The development and manufacture of an adsorbent to remove phosphate ion for the prevention of eutrophication in lakes are very important. The characteristics of phosphate adsorption onto aluminum oxide hydroxide were investigated to estimate the adsorption isotherms, the rate of adsorption, and the selectivity of adsorption. Phosphate was easily adsorbed onto aluminum oxide hydroxide, because of the hydroxyl groups. The adsorption of phosphate onto aluminum oxide hydroxide was influenced by pH in solution: the amount adsorbed was greatest at pH 4, ranging with pH from 2 to 9. The optimum pH for phosphate removal by aluminum oxide hydroxide is 4. The selectivity of phosphate adsorption onto aluminum oxide hydroxide was evaluated based on the amount of phosphate ion adsorbed onto aluminum oxide hydroxide from several anion complex solutions. It is phosphate that aluminum oxide hydroxide can selectively adsorb. The selectivity of phosphate onto aluminum oxide hydroxide was about 7000 times that of chloride. This result indicated that the hydroxyl groups on aluminum oxide hydroxide have selective adsorptivity for phosphate and could be used for the removal of phosphate from seawater.
authors.affiliation: School of Pharmaceutical Sciences, Kinki University, 3-4-1, Kowakae, Higashi-Osaka, Osaka 577-8502, Japan. tanada@phar.kindai.ac.jp
authors.forename: Seiki
authors.initials: S
authors.lastname: Tanada
authors.forename: Mineaki
authors.initials: M
authors.lastname: Kabayama
authors.forename: Naohito
authors.initials: N
authors.lastname: Kawasaki
authors.forename: Toru
authors.initials: T
authors.lastname: Sakiyama
authors.forename: Takeo
authors.initials: T
authors.lastname: Nakamura
authors.forename: Mamiko
authors.initials: M
authors.lastname: Araki
authors.forename: Takamichi
authors.initials: T
authors.lastname: Tamura
mesh_terms: D000327:Adsorption; D000536:Aluminum Hydroxide / Q000737:chemistry*; D000537:Aluminum Oxide / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry* / Q000493:pharmacokinetics; D012623:Seawater / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D010710:Phosphates; D000536:Aluminum Hydroxide; C069471:aluminum oxide hydroxide; D000537:Aluminum Oxide