title: Differences in the removal mechanisms of Undaria pinnatifida and Phragmites australis as biomaterials for lead removal.
abstract: This study offers the opportunity to utilize Undaria pinnatifida and Phragmites australis to remove lead from water in permeable reactive barrier (PRB) technology. Its efficacy was tested using batch experiments and PRB column systems. From the batch experiment results, a higher adsorption capacity was observed for Undaria pinnatifida. Nevertheless, Phragmites australis in the column system efficiently removed lead and the breakthrough occurred at the same time for both biomaterials. To dissipate this difference, a sequential extraction for metal speciation analysis was used for both columns. The results have shown that each biomaterial has a dominant mechanism. Phragmites australis removed lead by physical adsorption, whereas Undaria pinnatifida showed a higher tendency to bind lead due to organic matter, primary and secondary minerals.
authors.affiliation: Ecological Engineering Laboratory, Graduate School of Engineering, Tohoku University, Tohoku 980-8579, Japan E-mail: cecisoto@eco.civil.tohoku.ac.jp.
authors.forename: Paula Cecilia
authors.initials: PC
authors.lastname: Soto-Rios
authors.affiliation: Ecological Engineering Laboratory, Faculty of Engineering, Nihon University, Nihon 963-8642, Japan.
authors.forename: Kazunori
authors.initials: K
authors.lastname: Nakano
authors.affiliation: Ecological Engineering Laboratory, Graduate School of Engineering, Tohoku University, Tohoku 980-8579, Japan E-mail: cecisoto@eco.civil.tohoku.ac.jp.
authors.forename: Marco
authors.initials: M
authors.lastname: Leon-Romero
authors.affiliation: Ecological Engineering Laboratory, Graduate School of Engineering, Tohoku University, Tohoku 980-8579, Japan E-mail: cecisoto@eco.civil.tohoku.ac.jp.
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Aikawa
authors.affiliation: Environmental Technology Research Center, Mitsubishi Materials Corporation, 37-02 Uguizuwa-nangoaramachi, Kurihara, Miyagi 989-5402, Japan.
authors.forename: Shigeyuki
authors.initials: S
authors.lastname: Arai
authors.affiliation: Ecological Engineering Laboratory, Graduate School of Engineering, Tohoku University, Tohoku 980-8579, Japan E-mail: cecisoto@eco.civil.tohoku.ac.jp.
authors.forename: Osamu
authors.initials: O
authors.lastname: Nishimura
mesh_terms: D000327:Adsorption; D018533:Biomass; D007854:Lead / Q000302:isolation & purification*; D008962:Models, Theoretical; D006109:Poaceae / Q000737:chemistry* / Q000254:growth & development; D013499:Surface Properties; D044648:Undaria / Q000737:chemistry* / Q000254:growth & development; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D014874:Water Pollutants, Chemical; D007854:Lead