title: Surface modification of porous suspended ceramsite used for water treatment by activated carbon/Fe3O4 magnetic composites.
abstract: In this study, porous suspended ceramsite with a specific density close to that of water was prepared by high-temperature calcination using fly ash, feldspar, calcite, fired talc and kaolin as the raw materials. The ceramsite was modified by activated carbon/Fe3O4 magnetic composites. The optimum modification conditions determined by methylene blue adsorption experiment were: KOH/glucose ratio of 1.5:1, carbonization temperature of 400 degrees C, activation temperature of 850 degrees C, activation time of 1 h, and Fe3O4/KOH+glucose ratio of 1:10. The results demonstrated that the adsorption capacity of the modified ceramsite for methylene blue was significantly higher than that of the unmodified ones. The presence of the composites did not lead to significant decrease in the mechanical properties of the modified ceramsite. Moreover, the modified ceramsite showed good resistance towards acid and alkali. The modified ceramsite can be used as biocarrier and adsorbent for a wide range of contaminants in water and can subsequently be removed from the medium by a simple magnetic procedure.
authors.affiliation: School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi Province, China. bjmanglu@163.com
authors.forename: Mang
authors.initials: M
authors.lastname: Lu
authors.affiliation: School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi Province, China.
authors.forename: Guang-Hua
authors.initials: GH
authors.lastname: Xia
authors.affiliation: School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi Province, China.
authors.forename: Xiao-Dong
authors.initials: XD
authors.lastname: Zhao
mesh_terms: D002119:Calcium Carbonate / Q000737:chemistry; D002244:Carbon / Q000737:chemistry*; D060729:Coal Ash; D006358:Hot Temperature; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D008420:Manufactured Materials; D016062:Porosity; D017640:Silicates / Q000737:chemistry*; D013499:Surface Properties; D018508:Water Purification / Q000295:instrumentation* / Q000379:methods
chemical_list: D060729:Coal Ash; D058185:Magnetite Nanoparticles; D017640:Silicates; D002244:Carbon; D002119:Calcium Carbonate