title: Pine bark as bio-adsorbent for Cd, Cu, Ni, Pb and Zn: batch-type and stirred flow chamber experiments.
abstract: The objective of this work was to determine the retention of five metals on pine bark using stirred flow and batch-type experiments. Resulting from batch-type kinetic experiments, adsorption was rapid, with no significant differences for the various contact times. Adsorption was between 98 and 99% for Pb(2+), 83-84% for Cu(2+), 78-84% for Cd(2+), 77-83% for Zn(2+), and 70-75% for Ni(2+), and it was faster for low concentrations, with Pb suffering the highest retention, followed by Cu, Cd, Ni and Zn. The fitting to the Freundlich and Langmuir models was satisfactory. Desorption increased in parallel to the added concentrations, with Pb always showing the lowest levels. Stirred flow chamber experiments showed strong hysteresis for Pb and Cu, sorption being mostly irreversible. The differences affecting the studied heavy metals are mainly due to different affinity for the adsorption sites. Pine bark can be used to effectively remove Pb and Cu from polluted environments.
authors: Soil Science and Agricultural Chemistry Area, Faculty of Sciences, Campus Univ. Ourense, Campus de Ourense, University of Vigo, 32004 Galicia, Spain.
authors: L
authors: L
authors: Cutillas-Barreiro
authors: Soil Science and Agricultural Chemistry Area, Faculty of Sciences, Campus Univ. Ourense, Campus de Ourense, University of Vigo, 32004 Galicia, Spain.
authors: L
authors: L
authors: Ansias-Manso
authors: Department of Plant and Environmental Sciences, University of Copenhagen, Frederiksberg, Denmark.
authors: D
authors: D
authors: Fernández-Calviño
authors: Soil Science and Agricultural Chemistry Area, Faculty of Sciences, Campus Univ. Ourense, Campus de Ourense, University of Vigo, 32004 Galicia, Spain. Electronic address: mastevez@uvigo.es.
authors: M
authors: M
authors: Arias-Estévez
authors: Soil Science and Agricultural Chemistry Area, Faculty of Sciences, Campus Univ. Ourense, Campus de Ourense, University of Vigo, 32004 Galicia, Spain.
authors: J C
authors: JC
authors: Nóvoa-Muñoz
authors: Department of Soil Science and Agricultural Chemistry, Engineering Polytechnic School, Campus Univ. Lugo, University of Santiago de Compostela, Galicia, Spain.
authors: M J
authors: MJ
authors: Fernández-Sanjurjo
authors: Department of Soil Science and Agricultural Chemistry, Engineering Polytechnic School, Campus Univ. Lugo, University of Santiago de Compostela, Galicia, Spain.
authors: E
authors: E
authors: Álvarez-Rodríguez
authors: Department of Soil Science and Agricultural Chemistry, Engineering Polytechnic School, Campus Univ. Lugo, University of Santiago de Compostela, Galicia, Spain.
authors: A
authors: A
authors: Núñez-Delgado
mesh_terms: D000327:Adsorption; D004787:Environmental Pollution / Q000517:prevention & control*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D007700:Kinetics; D019216:Metals, Heavy / Q000737:chemistry*; D028223:Pinus / Q000737:chemistry; D024301:Plant Bark / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry*
chemical_list: D019216:Metals, Heavy; D012989:Soil Pollutants
keywords: Adsorption; Heavy metals; Pine bark; Stirred flow chamber