title: Production of adsorbents by pyrolysis of paper mill sludge and application on the removal of citalopram from water.
abstract: This work describes the production of alternative adsorbents from industrial residues and their application for the removal of a highly consumed antidepressant (citalopram) from water. The adsorbents were produced by pyrolysis of both primary and biological paper mill sludge at different temperatures and residence times. The original sludge and the produced chars were fully characterized by elemental and proximate analyses, total organic carbon, specific surface area (BET), N₂ isotherms, FTIR, (13)C and (1)H solid state NMR and SEM. Batch kinetic and equilibrium experiments were carried out to describe the adsorption of citalopram onto the produced materials. The fastest kinetics and the highest adsorption capacity were obtained using primary sludge pyrolysed at 800 °C during 150 min. The use of pyrolysed paper mill sludge for the remediation of contaminated waters might constitute an interesting application for the valorization of those wastes.
authors.affiliation: Department of Chemistry and CESAM (Centre for Environmental and Marine Studies), University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal. Electronic address: vania.calisto@ua.pt.
authors.forename: Vânia
authors.initials: V
authors.lastname: Calisto
authors.affiliation: Department of Chemistry and CESAM (Centre for Environmental and Marine Studies), University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: Catarina I A
authors.initials: CI
authors.lastname: Ferreira
authors.affiliation: Department of Chemistry and CICECO (Centre for Research in Ceramics and Composite Materials), University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: Sérgio M
authors.initials: SM
authors.lastname: Santos
authors.affiliation: Instituto Nacional del Carbón, INCAR-CSIC, Apartado 73, 33080 Oviedo, Spain.
authors.forename: María Victoria
authors.initials: MV
authors.lastname: Gil
authors.affiliation: Department of Applied Chemistry and Physics, IMARENABIO, University of Léon, Campus de Vegazana, Léon, Spain.
authors.forename: Marta
authors.initials: M
authors.lastname: Otero
authors.affiliation: Department of Chemistry and CESAM (Centre for Environmental and Marine Studies), University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: Valdemar I
authors.initials: VI
authors.lastname: Esteves
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry*; D015283:Citalopram / Q000032:analysis* / Q000737:chemistry; D005052:Eucalyptus; D007700:Kinetics; D010209:Paper; D012722:Sewage / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D012722:Sewage; D015283:Citalopram; D002244:Carbon
keywords: Biochar; Environment; Industrial residues; Pharmaceuticals; Remediation