title: Cr(VI) removal from wastewater using low cost sorbent materials: roots of Typha latifolia and ashes.
abstract: This work presents conditions for hexavalent chromium (Cr(VI)) removal from aqueous solution using different sorbent materials, namely: pyrolytic ashes of an industrial sludge from wastewater treatment and roots of Typha latifolia. The sorbent materials were characterized using scanning electron microscopy (SEM) and surface area using the Brunauer-Emmett-Teller (BET) technique, before and after the contact with the chromium-containing aqueous media. An overall Cr(VI) concentration reduction of 45% was achieved using the roots of Typha latifolia whereas in the case of pyrolytic ashes a 60% removal was observed. The percentage removal was found to depend on the initial Cr(VI) concentration in aqueous solution, pH and temperature. The Cr(VI) uptake process was maximum at pH 2 and a temperature of 40 degrees C for both sorbents. These materials showed a Cr(VI) adsorption capacity that was adequately described by the Langmuir adsorption isotherm. It was demonstrated that the use of waste materials for the treatment of Cr(VI)-containing wastewater is an effective and economical alternative method.
authors.affiliation: Universidad Autónoma del Estado de México. Facultad de Química. Paseo Colón intersección Paseo Tollocan S/N. C.P. 50120, Toluca, Estado de México, México.
authors.forename: C
authors.initials: C
authors.lastname: Barrera-Díaz
authors.forename: A
authors.initials: A
authors.lastname: Colín-Cruz
authors.forename: F
authors.initials: F
authors.lastname: Ureña-Nuñez
authors.forename: M
authors.initials: M
authors.lastname: Romero-Romo
authors.forename: M
authors.initials: M
authors.lastname: Palomar-Pardavé
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D002274:Carcinogens, Environmental / Q000302:isolation & purification*; D002857:Chromium / Q000302:isolation & purification*; D003363:Cost Control; D017745:Incineration; D007220:Industrial Waste; D018517:Plant Roots / Q000737:chemistry; D032401:Typhaceae / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods; D014873:Water Pollutants / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods
chemical_list: D002274:Carcinogens, Environmental; D007220:Industrial Waste; D014873:Water Pollutants; D002857:Chromium; C074702:chromium hexavalent ion