title: Removal of toxic Cr(VI) by the adsorption of activated carbons prepared from Simarouba shells.
abstract: Removal of toxic Cr(VI) in aqueous medium was investigated using activated carbon adsorbents prepared from Simarouba glauca seed shells. The pH effect, Cr(VI) concentration, adsorbent dosage and contact time period were studied in batch experiment. The removal of Cr(VI) was in general most effective at pH range 2.0-4.0 and high Cr(VI) concentrations. Activated carbons are prepared at 80050 degrees C temperature. One is non-impregnated and the remaining three are impregnated with zinc chloride in 1:1,1:2,1:3 ratio. Important characteristics of activated carbons are also investigated. The data for all the adsorbents fit well to the Freundlich adsorption isotherm. The removal of Cr(VI) is around 97% was observed with 1:2 impregnated activated carbon at pH 3.0 where as other adsorbents showed much lower activities.
authors.affiliation: Department of Chemistry, J.N.T.University, Anantapur-515 001, A.P., India.
authors.forename: A
authors.initials: A
authors.lastname: Neelavathi
authors.forename: K B Chandra
authors.initials: KB
authors.lastname: Sekhar
authors.forename: C Ramesh
authors.initials: CR
authors.lastname: Babu
authors.forename: K N
authors.initials: KN
authors.lastname: Jayaveera
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry; D002274:Carcinogens, Environmental / Q000737:chemistry* / Q000302:isolation & purification*; D002857:Chromium / Q000737:chemistry* / Q000302:isolation & purification*; D004787:Environmental Pollution / Q000517:prevention & control; D012639:Seeds; D032272:Simarouba
chemical_list: D002274:Carcinogens, Environmental; D002857:Chromium; C074702:chromium hexavalent ion; D002244:Carbon