title: MCM-48 modified magnetic mesoporous nanocomposite as an attractive adsorbent for the removal of sulfamethazine from water.
abstract: A novel magnetic mesoporous nanocomposite FeM48 was synthesized and applied to remove sulfamethazine (SMN) from water. The adsorption kinetics could be expressed by the pseudo-second-order model, where external and interfacial diffusions tended to be the rate-limiting step. The adsorption isotherms at varied temperatures were fitted well with Freundlich model, and thermodynamic analysis revealed that SMN adsorption on FeM48 was a spontaneous exothermic process. Solution pH exhibited a remarkable impact on the adsorption process and the maximum adsorbed concentration was obtained at pH 6.3. The effect of co-existing anions and humic acid demonstrated that SMN could be adsorbed selectively by FeM48. Hydrogen bonding between the nitrogen of the aniline, sulfinol or pyrimidine group of SMN and the surface hydroxyl group of FeM48 was the major driving force for adsorption. In addition, the π-π electron-donor-acceptor interaction between SMN (π-electron-acceptor) and MCM-48 (π-electron-donor) also promoted the adsorption process.
authors.affiliation: State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. qiangz@rcees.ac.cn
authors.forename: Zhimin
authors.initials: Z
authors.lastname: Qiang
authors.forename: Xiaolei
authors.initials: X
authors.lastname: Bao
authors.forename: Weiwei
authors.initials: W
authors.lastname: Ben
mesh_terms: D000327:Adsorption; D000838:Anions; D006812:Humic Substances / Q000032:analysis; D006860:Hydrogen Bonding; D006863:Hydrogen-Ion Concentration; D060328:Magnetic Phenomena; D008956:Models, Chemical; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D016062:Porosity; D011208:Powders; D012996:Solutions; D013418:Sulfamethazine / Q000737:chemistry / Q000302:isolation & purification*; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D014961:X-Ray Diffraction
chemical_list: D000838:Anions; D006812:Humic Substances; D011208:Powders; D012996:Solutions; D014874:Water Pollutants, Chemical; D013418:Sulfamethazine