title: Effects of physicochemical factors on Cr(VI) removal from leachate by zero-valent iron and alpha-Fe(2)O(3) nanoparticles.
abstract: The effects of nanoparticle dosage, initial hexavalent chromium concentration, pH value, reaction temperature, and initial concentration of humic acid (HA) on chromate (CrO(4)(2-)) removal from landfill leachate by nanoscale zero-valent iron (NZVI) and hematite (alpha-Fe(2)O(3)) nanoparticles were examined in the present investigations. The Cr(VI) removal rate decreased as the initial Cr(VI) concentration and the reaction temperature increased, whereas corresponding removal rate by NZVI was higher than that of alpha-Fe(2)O(3). The optimum pH for the removal of Cr(VI) by NZVI was found to be 5.0 and more than 99.0% of Cr(VI) was removed within 5 h. However, the removal rate by alpha-Fe(2)O(3) decreased as pH increased. Presence of HA resulted in substantial reduction in the rate and extent of Cr(VI) removal by NZVI, whereas Cr(VI) removal rate by alpha-Fe(2)O(3) did not significantly decrease as HA concentration increased from 0.5 g/L to 3.0 g/L. Increasing the dosage of nanoparticles enhanced the rate constant and the removal of Cr(VI) by NZVI and alpha-Fe(2)O(3) followed pseudo-first-order reaction kinetics. The information should be very useful for the successful application of NZVI and alpha-Fe(2)O(3) for the treatment of groundwater or raw wastewater.
authors.affiliation: School of Environmental Science and Technology, Tianjin University, Weijin Road 92, Nankai District, Tianjin 300072, China. liuty819@yahoo.com.cn
authors.forename: T Y
authors.initials: TY
authors.lastname: Liu
authors.forename: L
authors.initials: L
authors.lastname: Zhao
authors.forename: X
authors.initials: X
authors.lastname: Tan
authors.forename: S J
authors.initials: SJ
authors.lastname: Liu
authors.forename: J J
authors.initials: JJ
authors.lastname: Li
authors.forename: Y
authors.initials: Y
authors.lastname: Qi
authors.forename: G Z
authors.initials: GZ
authors.lastname: Mao
mesh_terms: D002857:Chromium / Q000737:chemistry* / Q000302:isolation & purification; D005290:Ferric Compounds / Q000737:chemistry*; D006812:Humic Substances; D007501:Iron / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification
chemical_list: D005290:Ferric Compounds; D006812:Humic Substances; D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion; C000499:ferric oxide; D007501:Iron