title: Phosphate adsorption ability of biochar/Mg-Al assembled nanocomposites prepared by aluminum-electrode based electro-assisted modification method with MgCl₂ as electrolyte.
abstract: In this work, the textural properties and phosphate adsorption capability of modified-biochar containing Mg-Al assembled nanocomposites prepared by an effective electro-assisted modification method with MgCl2 as an electrolyte have been determined. Structure and chemical analyses of the modified-biochar showed that nano-sized stonelike or flowerlike Mg-Al assembled composites, MgO, spinel MgAl2O4, AlOOH, and Al2O3, were densely grown and uniformly dispersed on the biochar surface. The adsorption isotherm and kinetics data suggested that the biochar/Mg-Al assembled nanocomposites have an energetically heterogeneous surface and that phosphate adsorption could be controlled by multiple processes. The maximum phosphate adsorption capacity was as high as 887 mg g(-1), as fitted by the Langmuir-Freundlich model, and is the highest value ever reported. It was concluded that this novel electro-assisted modification is a very attractive method and the biochar/Mg-Al assembled nanocomposites provide an excellent adsorbent that can effectively remove phosphate from aqueous solutions.
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: Tae-Un
authors.initials: TU
authors.lastname: Jeong
authors.affiliation: Future Environmental Research Center, Korea Institute of Toxicology, 17 Jeigok-gil, Munsan, Jinju, Gyeongsangnam-do 660-844, South Korea.
authors.forename: Min-Jin
authors.initials: MJ
authors.lastname: Hwang
authors.affiliation: Environmental Business Team, R&D Division, KG Chemical, Sihwa Industrial Complex 1Da 106, 5, Somanggongwon-ro, Siheung-si, Gyeonggi-do 429-848, South Korea.
authors.forename: Kipal
authors.initials: K
authors.lastname: Kim
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; D000535:Aluminum / Q000737:chemistry; D000537:Aluminum Oxide / Q000737:chemistry; D002606:Charcoal / Q000737:chemistry*; D055664:Electrochemical Techniques / Q000295:instrumentation / Q000379:methods*; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D015636:Magnesium Chloride / Q000737:chemistry; D008277:Magnesium Oxide / Q000737:chemistry; D053761:Nanocomposites / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D010710:Phosphates; C540010:biochar; C111130:spinell; D015636:Magnesium Chloride; D002606:Charcoal; D008277:Magnesium Oxide; D000535:Aluminum; D000537:Aluminum Oxide
keywords: Kinetic analysis; MgO; Mg–Al assembled nanocomposites; Modified-biochar; Spinel MgAl(2)O(4)