title: A novel approach for preparation of modified-biochar derived from marine macroalgae: Dual purpose electro-modification for improvement of surface area and metal impregnation.
abstract: In the present study, an aluminum electrode-based electrochemical process was newly adopted as a modification method for fabricating physically and chemically modified biochar derived from marine macroalgae. Specifically, a current density of 93.96 mA cm(-2) was applied for 5 min at pH 3.0. Subsequently, the mixture was stirred continuously for 30 min without electric field, and the dried sample was then pyrolyzed at 450 °C under a N2 environment for 2 h. SEM-EDS and XRD analyses clearly indicated that nano-sized aluminum crystals (beohemite, AlOOH) were uniformly present on the EM-biochar surface. Adsorption equilibrium tests showed that the phosphate adsorption onto EM-biochar agreed well with the Langmuir-Freundlich adsorption isotherm model, with a maximum adsorption capacity of 31.28 mg-P g(-1). These findings suggest that this novel and simple electro-modification method is a reasonable and effective option for simultaneously upgrading both the surface area and chemical properties of biochar.
authors.affiliation: Center for Water Resources Cycle Research, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, South Korea.
authors.forename: Kyung-Won
authors.initials: KW
authors.lastname: Jung
authors.affiliation: Center for Water Resources Cycle Research, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, South Korea.
authors.forename: Min-Jin
authors.initials: MJ
authors.lastname: Hwang
authors.affiliation: Center for Water Resources Cycle Research, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, South Korea.
authors.forename: Tae-Un
authors.initials: TU
authors.lastname: Jeong
authors.affiliation: Center for Water Resources Cycle Research, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, South Korea. Electronic address: khahn@kist.re.kr.
authors.forename: Kyu-Hong
authors.initials: KH
authors.lastname: Ahn
mesh_terms: D000327:Adsorption; D002606:Charcoal; D055664:Electrochemical Techniques / Q000379:methods*; D008386:Marine Biology; D008670:Metals / Q000737:chemistry*; D012624:Seaweed / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D008670:Metals; C540010:biochar; D002606:Charcoal
keywords: Adsorption isotherm; Beohemite; Black carbon; Modified-biochar; Phosphate