title: Microporous spongy chitosan monoliths doped with graphene oxide as highly effective adsorbent for methyl orange and copper nitrate (Cu(NO3)2) ions.
abstract: In the current study, microporous spongy chitosan monoliths doped with small amount of graphene oxide (CSGO monoliths) with high porosity (96-98%), extraordinary high water absorption (more than 2000%) and low density (0.0436-0.0607 g cm(-3)) were prepared by the freeze-drying method and used as adsorbents for anionic dyes methyl orange (MO) and Cu(2+) ions. The adsorption behavior of the CSGO monoliths and influencing factors such as pH value, graphene oxide (GO) content, concentration of pollutants as well as adsorption kinetics were studied. Specifically, the saturated adsorption capacity for MO is 567.07 mg g(-1), the highest comparing with other publication results, and it is 53.69 mg g(-1) for Cu(2+) ions. Since they are biodegradable, non-toxic, efficient, low-cost and easy to prepare, we believe that these microporous spongy CSGO monoliths will be the promising candidates for water purification.
authors.affiliation: College of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.affiliation: College of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Xu
authors.initials: X
authors.lastname: Liu
authors.affiliation: College of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Hongfang
authors.initials: H
authors.lastname: Wang
authors.affiliation: College of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Guangmei
authors.initials: G
authors.lastname: Xia
authors.affiliation: Laboratory of Advanced Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Huang
authors.affiliation: College of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: rsong@ucas.ac.cn.
authors.forename: Rui
authors.initials: R
authors.lastname: Song
mesh_terms: D000327:Adsorption; D001391:Azo Compounds / Q000302:isolation & purification*; D048271:Chitosan / Q000737:chemistry*; D003300:Copper / Q000302:isolation & purification*; D005612:Freeze Drying; D005618:Fresh Water / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D009566:Nitrates / Q000302:isolation & purification*; D010087:Oxides; D016062:Porosity; D053838:Scattering, Small Angle; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods; D014961:X-Ray Diffraction
chemical_list: D001391:Azo Compounds; D009566:Nitrates; D010087:Oxides; D014874:Water Pollutants, Chemical; C100258:methyl orange; D006108:Graphite; D003300:Copper; D048271:Chitosan; C516433:copper(II) nitrate
keywords: Adsorption; Chitosan; Graphene oxide; Methyl orange (MO); Water purification