title: Fabrication of porosity-enhanced MgO/biochar for removal of phosphate from aqueous solution: Application of a novel combined electrochemical modification method.
abstract: A novel combined electrochemical modification (CEM) method, using a graphite electrode-based electric field and MgCl2 as electrolyte, was newly developed to prepare porosity-enhanced biochar containing periclase (MgO) nanocomposites (PE-MgO/biochar). During the CEM method, the dried marine macroalgae was immersed in the MgCl2 solution, and a voltage of 20V was then applied for 10min prior to pyrolysis. Morphological and chemical analyses results showed that nano-sized MgO particles with a highly crystalline structure were dispersed and enriched on the surface of the PE-MgO/biochar, which enabled higher phosphate adsorption capability. In an adsorption equilibrium test, among various biochars, PE-MgO/biochar exhibited the highest phosphate adsorption capacity from aqueous solution with a Langmuir-Freundlich maximum adsorption capacity as high as 620mg-Pg(-1). It can be concluded that the newly introduced CEM method is a potent additional technique to effectively prepare modified-biochar in terms of a simple and time-saving modification method.
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. 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; D004566:Electrodes; D015636:Magnesium Chloride / Q000737:chemistry; D008277:Magnesium Oxide / Q000737:chemistry*; D010710:Phosphates / Q000302:isolation & purification*; D016062:Porosity; D012624:Seaweed / Q000737:chemistry*; D012996:Solutions / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification
chemical_list: D010710:Phosphates; D012996:Solutions; D014874:Water Pollutants, Chemical; C540010:biochar; D015636:Magnesium Chloride; D002606:Charcoal; D008277:Magnesium Oxide
keywords: Adsorption isotherm; Biochar; Marine macroalgae; MgO; Phosphate