title: Removal of chromium from aqueous solution using polyaniline--poly ethylene glycol composite.
abstract: The adsorption of chromium compounds from solutions by a composite of polyaniline/poly ethylene glycol (PANi/PEG) was investigated in this study. Experiments were conducted in batch mode under various operational conditions including agitation time, solution pH, PANi/PEG dose and initial concentration of chromium salts. Results showed that concentration of PEG at synthesizing stage has a significant effect on the capacity of produced composite for removal of chromium. Morphologically, PANi/PEG composite is closely dependent on the concentration of PEG. Maximum removal of hexavalent chromium was experienced when 2g/L of PEG was used in synthesis of PANi/PEG. Removal of hexavalent chromium by PANi/PEG composite included surface adsorption and reduction reaction. The optimum pH was 5 and the equilibrium time for hexavalent chromium removal was about 30 min. Investigation of the isothermal characteristics showed that chromium adsorption by PANi/PEG composite was in high accordance with Langmuir's isotherm.
authors.affiliation: Department of Environment and Energy, Science and Research Branch, Islamic Azad University, Tehran, Iran. Electronic address: Majidriahisamani@gmail.com.
authors.forename: Majid Riahi
authors.initials: MR
authors.lastname: Samani
authors.affiliation: Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran.
authors.forename: Seyed Mehdi
authors.initials: SM
authors.lastname: Borghei
authors.affiliation: Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran.
authors.forename: Ali
authors.initials: A
authors.lastname: Olad
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Mazandaran, Babolsar, Iran.
authors.forename: Mohammad Javad
authors.initials: MJ
authors.lastname: Chaichi
mesh_terms: D000327:Adsorption; D000814:Aniline Compounds / Q000737:chemistry*; D002857:Chromium / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D008855:Microscopy, Electron, Scanning; D011092:Polyethylene Glycols / Q000737:chemistry*; D012996:Solutions; D013816:Thermodynamics; D014867:Water; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D000814:Aniline Compounds; D012996:Solutions; D014874:Water Pollutants, Chemical; C416807:polyaniline; D014867:Water; D002857:Chromium; D011092:Polyethylene Glycols