title: Preparation of a Two-Dimensional Ion-Imprinted Polymer Based on a Graphene Oxide/SiO₂ Composite for the Selective Adsorption of Nickel Ions.
abstract: In the present work, a novel two-dimensional (2D) nickel ion-imprinted polymer (RAFT-IIP) has been successfully synthesized based on the graphene oxide/SiO2 composite by reversible addition-fragmentation chain-transfer (RAFT) polymerization. The imprinted materials obtained are characterized by Fourier transmission infrared spectrometry (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). The results show that the thermal stability of the graphene oxide/SiO2 composite is obviously higher than that of graphene oxide. RAFT-IIP possesses an excellent 2D homogeneous imprinted polymer layer, which is a well-preserved unique structure of graphene oxide/SiO2. Owing to the intrinsic advantages of RAFT polymerization and 2D imprinted material, RAFT-IIP demonstrate a superior specific adsorption capacity (81.73 mg/g) and faster adsorption kinetics (30 min) for Ni(II) in comparison to the ion-imprinted polymer prepared by traditional radical polymerization and based on the common carbon material. Furthermore, the adsorption isotherm and selectivity toward Ni(II) onto RAFT-IIP and nonimprinted polymer (NIP) are investigated, indicating that RAFT-IIP has splendid recognizing ability and a nearly 3 times larger adsorption capacity than that of NIP (30.94 mg/g). Moreover, a three-level Box-Behnken experimental design with three factors combining the response surface method is utilized to optimize the desorption process. The optimal conditions for the desorption of Ni(II) from RAFT-IIP are as follows: an HCl-type eluent, an eluent concentration of 2.0 mol/L, and an eluent volume of 10 mL.
authors.affiliation: †School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Liu
authors.forename: Xiangguo
authors.initials: X
authors.lastname: Meng
authors.forename: Zhanchao
authors.initials: Z
authors.lastname: Liu
authors.affiliation: †School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China.
authors.forename: Minjia
authors.initials: M
authors.lastname: Meng
authors.affiliation: ∥Zhenjiang Center for Disease Prevention and Control, Zhenjiang 212013, China.
authors.forename: Fangping
authors.initials: F
authors.lastname: Jiang
authors.forename: Min
authors.initials: M
authors.lastname: Luo
authors.affiliation: †School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China.
authors.forename: Liang
authors.initials: L
authors.lastname: Ni
authors.affiliation: †School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Qiu
authors.affiliation: †School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China.
authors.forename: Fangfang
authors.initials: F
authors.lastname: Liu
authors.affiliation: †School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China.
authors.forename: Guoxing
authors.initials: G
authors.lastname: Zhong
mesh_terms: D000327:Adsorption; D006108:Graphite / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D054802:Molecular Imprinting; D009532:Nickel / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D010316:Particle Size; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D007477:Ions; D010087:Oxides; D011108:Polymers; D012822:Silicon Dioxide; D006108:Graphite; D009532:Nickel