title: Removal of Cu(2+) by biochars derived from green macroalgae.
abstract: The by-product char of the fast pyrolysis of a green macroalga Enteromorpha compressa was used to remove copper from an aqueous solution. The surface area and the amount of cation exchange capacity (CEC) were increased by steam activation, resulting in enhanced adsorption capacity. Although chemical activation using a KOH solution increased the pore volume and surface area dramatically, it decreased the adsorption capacity because of activating in the KOH solution and washing decreased CEC. Ion exchange between the Cu ions and cations (Na(+), K(+), Ca(2+), and Mg(2+)) as well as adsorption onto the functional groups on the char surface appeared to be important mechanisms for the removal of Cu. A pseudo-second-order kinetic model and Langmuir isotherm model could interpret the kinetics and equilibrium of the Cu adsorption on the E. compressa char. The maximum amount of Cu adsorption on the char was 137 mg g(-1).
authors: School of Environmental Engineering, University of Seoul, Seoul, 130-743, Republic of Korea.
authors: Beom-Sik
authors: BS
authors: Kim
authors: School of Environmental Engineering, University of Seoul, Seoul, 130-743, Republic of Korea.
authors: Hyung Won
authors: HW
authors: Lee
authors: Department of Environmental Engineering, Sunchon National University, Suncheon, 540-950, Republic of Korea.
authors: Sung Hoon
authors: SH
authors: Park
authors: Department of Environmental Engineering, Chonbuk National University, Jeonju, 561-756, Republic of Korea.
authors: Kitae
authors: K
authors: Baek
authors: Department of Chemical Engineering, Kongju National University, Cheonan, 330-717, Republic of Korea.
authors: Jong-Ki
authors: JK
authors: Jeon
authors: School of Environmental Engineering, University of Seoul, Seoul, 130-743, Republic of Korea.
authors: Hye Jung
authors: HJ
authors: Cho
authors: Department of Environmental Engineering, Sunchon National University, Suncheon, 540-950, Republic of Korea.
authors: Sang-Chul
authors: SC
authors: Jung
authors: Department of Environmental Education, Mokpo National University, Muan, 534-729, Republic of Korea.
authors: Sang Chai
authors: SC
authors: Kim
authors: School of Environmental Engineering, University of Seoul, Seoul, 130-743, Republic of Korea. catalica@uos.ac.kr.
authors: Young-Kwon
authors: YK
authors: Park
mesh_terms: D000327:Adsorption; D002606:Charcoal; D003300:Copper / Q000302:isolation & purification*; D007474:Ion Exchange; D012624:Seaweed / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D014874:Water Pollutants, Chemical; C540010:biochar; D002606:Charcoal; D003300:Copper
keywords: Adsorption; Biochar; Cu; Enteromorpha compressa; Green macroalgae; Ion exchange