title: The simultaneous removal of calcium and chloride ions from calcium chloride solution using magnesium-aluminum oxide.
abstract: We investigated the removal of Ca(2+) and Cl(-) from CaCl(2) solution at 20-60 degrees C, using magnesium-aluminum oxide, Mg(0.80)Al(0.20)O(1.10), prepared by the thermal decomposition of a hydrotalcite-like compound, Mg(0.80)Al(0.20)(OH)(2)(CO(3))(0.10).0.78 H(2)O. The degree of Ca(2+) and Cl(-) removal from the solution increased with increasing initial CaCl(2) concentration, temperature, and quantity of Mg(0.80)Al(0.20)O(1.10) added. When Mg(0.80)Al(0.20)O(1.10) was added to 0.25 M CaCl(2) solution in a Mg(0.80)Al(0.20)O(1.10)/CaCl(2) molar ratio of 20, the degree of Ca(2+) and Cl(-) removal from the solution at 60 degrees C after 0.5 h was 93.0% and 98.2%, respectively. These results reveal that Mg(0.80)Al(0.20)O(1.10) has the capacity to remove Ca(2+) and Cl(-) simultaneously from aqueous solution.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Aoba 07, Aoba-ku, Sendai 980-8579, Japan. kameda@tagen.tokohu.ac.jp
authors.forename: Tomohito
authors.initials: T
authors.lastname: Kameda
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Yoshioka
authors.forename: Teruhisa
authors.initials: T
authors.lastname: Mitsuhashi
authors.forename: Miho
authors.initials: M
authors.lastname: Uchida
authors.forename: Akitsugu
authors.initials: A
authors.lastname: Okuwaki
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D002118:Calcium / Q000737:chemistry / Q000302:isolation & purification*; D002122:Calcium Chloride / Q000737:chemistry*; D002712:Chlorides / Q000737:chemistry / Q000302:isolation & purification*; D007477:Ions; D008274:Magnesium / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
chemical_list: D002712:Chlorides; D007477:Ions; D008274:Magnesium; D000537:Aluminum Oxide; D002122:Calcium Chloride; D002118:Calcium