title: Conversion of agricultural residues into activated carbons for water purification: Application to arsenate removal.
abstract: The conversion of two agricultural wastes, sugar beet pulp and peanut hulls, into sustainable activated carbons is presented and their potential application for the treatment of arsenate solution is investigated. A direct and physical activation is selected as well as a simple chemical treatment of the adsorbents. The material properties, such as BET surface areas, porous volumes, elemental analysis, ash contents and pH(PZC), of these alternative carbonaceous porous materials are determined and compared with a commercial granular activated carbon. An adsorption study based on experimental kinetic and equilibrium data is conducted in a batch reactor and completed by the use of different models (intraparticle diffusion, pseudo-second-order, Langmuir and Freundlich) and by isotherms carried out in natural waters. It is thus demonstrated that sugar beet pulp and peanut hulls are good precursors to obtain activated carbons for arsenate removal.
authors.affiliation: Centro Interamericano de Recursos del Agua, Facultad de Ingeniería, Universidad Autónoma del Estado de México, Cerro de Coatepec, Ciudad Universitaria, Toluca, Estado de México, México.
authors.forename: Jonatan
authors.initials: J
authors.lastname: Torres-Perez
authors.forename: Claire
authors.initials: C
authors.lastname: Gerente
authors.forename: Yves
authors.initials: Y
authors.lastname: Andres
mesh_terms: D000327:Adsorption; D000383:Agriculture; D001149:Arsenates / Q000302:isolation & purification*; D001151:Arsenic / Q000302:isolation & purification; D002244:Carbon / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D013052:Spectrometry, X-Ray Emission; D013816:Thermodynamics; D018508:Water Purification / Q000379:methods*
chemical_list: D001149:Arsenates; D002244:Carbon; D001151:Arsenic; C025657:arsenic acid