title: Impact of Al2O3 on the aggregation and deposition of graphene oxide.
abstract: To assess the environmental behavior and impact of graphene oxide (GO) on living organisms more accurately, the aggregation of GO and its deposition on Al2O3 particles were systematically investigated using batch experiments across a wide range of solution chemistries. The results indicated that the aggregation of GO and its deposition on Al2O3 depended on the solution pH and the types and concentrations of electrolytes. MgCl2 and CaCl2 destabilized GO because of their effective charge screening and neutralization, and the presence of NaH2PO4 and poly(acrylic acid) (PAA) improved the stability of GO with the increase in pH values as a result of electrostatic interactions and steric repulsion. Specifically, the dissolution of Al2O3 contributed to GO aggregation at relatively low pH or high pH values. Results from this study provide critical information for predicting the fate of GO in aquatic-terrestrial transition zones, where aluminum (hydro)oxides are present.
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences , P.O. Box 1126, 230031, Hefei, P.R. China.
authors.forename: Xuemei
authors.initials: X
authors.lastname: Ren
authors.forename: Jiaxing
authors.initials: J
authors.lastname: Li
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Tan
authors.forename: Weiqun
authors.initials: W
authors.lastname: Shi
authors.forename: Changlun
authors.initials: C
authors.lastname: Chen
authors.forename: Dadong
authors.initials: D
authors.lastname: Shao
authors.forename: Tao
authors.initials: T
authors.lastname: Wen
authors.forename: Longfei
authors.initials: L
authors.lastname: Wang
authors.forename: Guixia
authors.initials: G
authors.lastname: Zhao
authors.forename: Guoping
authors.initials: G
authors.lastname: Sheng
authors.forename: Xiangke
authors.initials: X
authors.lastname: Wang
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D000537:Aluminum Oxide / Q000737:chemistry*; D000838:Anions; D002412:Cations; D004777:Environment; D006108:Graphite / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D012995:Solubility; D012996:Solutions; D014867:Water / Q000737:chemistry
chemical_list: D000180:Acrylic Resins; D000838:Anions; D002412:Cations; D012996:Solutions; D014867:Water; C006903:carbopol 940; D006108:Graphite; D000537:Aluminum Oxide