title: Preparation of alumina nanoshell coated porous silica spheres for inorganic anions separation.
abstract: It had been reported that alumina nanoshell coating could be obtained on the external surface of various substrates in one-nanometer precision in aqueous solution. In this work, alumina nanoshell coated mesoporous silica microbeads (nanoAl2O3/mesoSiO2) were prepared with the similar method, and were successfully applied to inorganic anions separation. As the mass transfer speed is largely constrained in the mesopore compared with that on the open surface, it was found that a complete alumina nanoshell coating could be obtained within the mesopore until the five-time coating was carried out. After characterization by BET, SEM and FTIR, it was found that the obtained nanoAl2O3/mesoSiO2 particles are smooth and well dispersed, and the mesopores are well reserved. In addition, the full coverage of nanoAl2O3 shell in mesopores was also confirmed by the binding capacity experiments with berberine. Finally, the nanoAl2O3/mesoSiO2 particles were packed in silica capillary for the separation of inorganic anions I(-), SCN(-), Br(-), NO2(-) and NO3(-) with ion chromatography (IC), and a column efficiency of 3.8 × 10(4) plates per meter was obtained for I(-).
authors.affiliation: Key Laboratory of Separation Science for Analytical Chemistry of CAS, Dept. of Instrumentation & Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
authors.forename: Zhihua
authors.initials: Z
authors.lastname: Song
authors.affiliation: Key Laboratory of Separation Science for Analytical Chemistry of CAS, Dept. of Instrumentation & Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, PR China. Electronic address: dpwu@dicp.ac.cn.
authors.forename: Dapeng
authors.initials: D
authors.lastname: Wu
authors.affiliation: Key Laboratory of Separation Science for Analytical Chemistry of CAS, Dept. of Instrumentation & Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, PR China.
authors.forename: Kun
authors.initials: K
authors.lastname: Ding
authors.affiliation: Key Laboratory of Separation Science for Analytical Chemistry of CAS, Dept. of Instrumentation & Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, PR China. Electronic address: guanyafeng@dicp.ac.cn.
authors.forename: Yafeng
authors.initials: Y
authors.lastname: Guan
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D000838:Anions; D001965:Bromides / Q000032:analysis; D002853:Chromatography, Liquid / Q000295:instrumentation* / Q000379:methods; D007454:Iodides / Q000032:analysis; D008863:Microspheres; D057145:Nanoshells; D009566:Nitrates / Q000032:analysis; D009573:Nitrites / Q000032:analysis; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*
chemical_list: D000838:Anions; D001965:Bromides; D007454:Iodides; D009566:Nitrates; D009573:Nitrites; D012822:Silicon Dioxide; D000537:Aluminum Oxide
keywords: Alumina nanoshell coated mesoporous silica microbeads (nanoAl(2)O(3)/mesoSiO(2)); Inorganic anions; Ion chromatography (IC)