title: Preparation of Three-Dimensional Chitosan-Graphene Oxide Aerogel for Residue Oil Removal.
abstract: Graphene oxide has been used as an adsorbent in wastewater treatment. However, the hydrophily and dispersibility in aqueous solution limit its practical application in environmental protection. In this paper, a novel, environmentally friendly adsorbent, chitosan and chitosan-graphene oxide aerogels with a diverse shape, large specific surface area, and unique porous structure were prepared by a freeze-drying method. The structure of the adsorbents was investigated using scanning electron microscopy, Fourier transform-infrared spectroscopy, and X-ray diffraction (XRD); the specific surface area and swelling capability were also characterized. In addition, removal of diesel oil from seawater by chitosan aerogel (CSAG) and chitosan-graphene oxide aerogel (AGGO-1 and AGGO-2) was studied and batch adsorption experiments were carried out as a function of different adsorbent dosages (0-6 g), contact time (0-120 minutes), pH (3-9), and initial concentrations of oil residue (3-30 g/L) to determine the optimum condition for the adsorption of residue oil from seawater. The results showed that the chitosan-graphene oxide aerogels were more effective to remove diesel oil from seawater compared with pure chitosan aerogel. A removal efficiency ≥ 95% of the chitosan-graphene oxide aerogels could be achieved easily at the initial concentrations of 20 g/L, which indicated that the chitosan-graphene oxide aerogels can be used to treat the industrial oil leakage or effluent in the natural water.
authors.affiliation: College of Textiles & Clothing, Qingdao University, Qingdao, Shandong, 266071, China.
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Guo
authors.forename: Lijun
authors.initials: L
authors.lastname: Qu
authors.forename: Shifeng
authors.initials: S
authors.lastname: Zhu
authors.forename: Mingwei
authors.initials: M
authors.lastname: Tian
authors.forename: Xiansheng
authors.initials: X
authors.lastname: Zhang
authors.forename: Kaikai
authors.initials: K
authors.lastname: Sun
authors.forename: Xiaoning
authors.initials: X
authors.lastname: Tang
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000737:chemistry*; D005612:Freeze Drying; D005742:Gasoline; D006108:Graphite / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D012623:Seawater / Q000032:analysis*; D017550:Spectroscopy, Fourier Transform Infrared; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D005742:Gasoline; D014874:Water Pollutants, Chemical; D006108:Graphite; D048271:Chitosan