title: Adsorbent for hydroquinone removal based on graphene oxide functionalized with magnetic cyclodextrin-chitosan.
abstract: Magnetic cyclodextrin-chitosan/graphene oxide (CCGO) with high surface area was synthesized via a simple chemical bonding method. The characteristics results of FTIR, SEM, TEM and XRD showed that CCGO was prepared. The large saturation magnetization (22.35 emu/g) of the synthesized nanoparticles allows fast separation of the CCGO from liquid suspension. These composites could efficiently remove hydroquinone from simulated wastewater with a facile subsequent solid-liquid separation because of their large area, abundant hydroxyl and amino groups with handy operation, and hydrophobicity. The hydroquinone removal process was found to obey the Freundlich adsorption model and its kinetics followed pseudo-second-order rate equation. The hydroquinone removal mechanism of CCGO might be attributed to the electrostatic adsorption of hydroquinone in the form of negatively charged hydroquinone by positively charged chitosan, accompanying hydroquinone absorbed by cavities of the cyclodextrin, and forming hydrogen bonds between hydroquinone and the hydroxyl groups on the surface of CCGO. The used CCGO could be recovered with ethanol. This study provides a promising nanostructured adsorbent with easy separation property for heavy metal ions removal.
authors.affiliation: Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong (University of Jinan), School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China. haoyunlileilei@163.com
authors.forename: Leilei
authors.initials: L
authors.lastname: Li
authors.forename: Lulu
authors.initials: L
authors.lastname: Fan
authors.forename: Min
authors.initials: M
authors.lastname: Sun
authors.forename: Huamin
authors.initials: H
authors.lastname: Qiu
authors.forename: Xiangjun
authors.initials: X
authors.lastname: Li
authors.forename: Huimin
authors.initials: H
authors.lastname: Duan
authors.forename: Chuannan
authors.initials: C
authors.lastname: Luo
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000031:analogs & derivatives* / Q000737:chemistry*; D003505:Cyclodextrins / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D006873:Hydroquinones / Q000737:chemistry* / Q000302:isolation & purification; D007700:Kinetics; D060328:Magnetic Phenomena; D008855:Microscopy, Electron, Scanning; D010087:Oxides / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D062065:Wastewater / Q000737:chemistry; D018508:Water Purification; D014961:X-Ray Diffraction
chemical_list: D048271:Chitosan; D003505:Cyclodextrins; D006108:Graphite; D006873:Hydroquinones; D010087:Oxides; D062065:Wastewater; C031927:hydroquinone