title: Competitive adsorption of heavy metals onto sesame straw biochar in aqueous solutions.
abstract: Objective of this research was to evaluate adsorption of heavy metals in mono and multimetal forms onto sesame straw biochar (SSB). Competitive sorption of metals by SSB has never been reported previously. The maximum adsorption capacities (mgg(-1)) of metals by SSB were in the order of Pb (102)≫Cd (86)≫Cr (65)>Cu (55)≫Zn (34) in the monometal adsorption isotherm and Pb (88)≫Cu (40)≫Cr (21)>Zn (7)⩾Cd (5) in the multimetal adsorption isotherm. Based on data obtained from the distribution coefficients, Freundlich and Langmuir adsorption models, and three-dimensional simulation, multimetal adsorption behaviors differed from monometal adsorption due to competition. Especially, during multimetal adsorption, Cd was easily exchanged and substituted by other metals. Further competitive adsorption studies are necessary in order to accurately estimate the heavy metal adsorption capacity of biochar in natural environments.
authors.affiliation: Divison of Applied Life Science (BK21 Program) & Institute of Agriculture and Life Science, Gyeongsang National University, Jinju 660-701, South Korea.
authors.forename: Jong-Hwan
authors.initials: JH
authors.lastname: Park
authors.affiliation: Korea Biochar Research Center & Department of Biological Environment, Kangwon National University, Chuncheon 200-701, Republic of Korea.
authors.forename: Yong Sik
authors.initials: YS
authors.lastname: Ok
authors.affiliation: Divison of Applied Life Science (BK21 Program) & Institute of Agriculture and Life Science, Gyeongsang National University, Jinju 660-701, South Korea.
authors.forename: Seong-Heon
authors.initials: SH
authors.lastname: Kim
authors.affiliation: Department of Bio-Environmental Sciences, Sunchon National University, Suncheon 540-950, South Korea. Electronic address: chojs@sunchon.ac.kr.
authors.forename: Ju-Sik
authors.initials: JS
authors.lastname: Cho
authors.affiliation: Divison of Applied Life Science (BK21 Program) & Institute of Agriculture and Life Science, Gyeongsang National University, Jinju 660-701, South Korea.
authors.forename: Jong-Soo
authors.initials: JS
authors.lastname: Heo
authors.affiliation: Department of Oceanography and Costal Sciences, School of the Coast and Environment, Louisiana State University, Baton Rouge, LA 70803, USA.
authors.forename: Ronald D
authors.initials: RD
authors.lastname: Delaune
authors.affiliation: Department of Bio-Environmental Sciences, Sunchon National University, Suncheon 540-950, South Korea. Electronic address: drseodc@gmail.com.
authors.forename: Dong-Cheol
authors.initials: DC
authors.lastname: Seo
mesh_terms: D000327:Adsorption; D002606:Charcoal / Q000737:chemistry*; D019216:Metals, Heavy / Q000737:chemistry*; D031685:Sesamum / Q000737:chemistry*; D012996:Solutions; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D019216:Metals, Heavy; D012996:Solutions; D014874:Water Pollutants, Chemical; C540010:biochar; D014867:Water; D002606:Charcoal
keywords: Biochar; Competitive adsorption; Freundlich isotherm; Langmuir isotherm; Sesame straw; Three-dimension simulation