title: New Insight into GO, Cadmium(II), Phosphate Interaction and Its Role in GO Colloidal Behavior.
abstract: This study establishes the relationship between the graphene oxide (GO) colloidal behavior and the co-adsorption of Cd(II) and phosphate (P(V)) on GO. Results reveal that the interactions among GO, Cd(II), and P(V) exhibit a significant dependence on solution chemistry and addition sequences and that these interactions subsequently affect the GO colloidal behavior. The GO aggregation is pH-dependent at pH < 4.0 and depends apparently on the binding ability of Cd(II) to GO at pH > 4.0. When the components were added simultaneously, the presence of P(V) enhances the GO binding capacity toward Cd(II), confirmed by theoretical calculation, resulting in the greater destabilizing influence of Cd(II) + P(V) on GO than Cd(II) at pH 3.0-9.5, while the formation of Cd3(PO4)2 precipitate leads to a lower destabilizing influence of Cd(II) + P(V) on GO than Cd(II) at pH > 9.5. Both pH and addition sequence affect the destabilizing ability of Cd(II) + P(V). These new insights are expected to provide valuable information not only for the application of GO as a potential adsorbent in multicomponent systems for heavy metal ion and oxyanion co-removal but also for the fate and risk assessment of GO after serving as heavy metal ion and oxyanion carrier.
authors.affiliation: School of Environment and Chemical Engineering, North China Electric Power University , Beijing 102206, People's Republic of China.|Institute of Plasma Physics, Chinese Academy of Sciences , P. O. Box 1126, 230031, Hefei, People's Republic of China.
authors.forename: Xuemei
authors.initials: X
authors.lastname: Ren
authors.affiliation: Laboratory of Nuclear Energy Chemistry and Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100049, People's Republic of China.
authors.forename: Qunyan
authors.initials: Q
authors.lastname: Wu
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences , P. O. Box 1126, 230031, Hefei, People's Republic of China.
authors.forename: Huan
authors.initials: H
authors.lastname: Xu
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences , P. O. Box 1126, 230031, Hefei, People's Republic of China.
authors.forename: Dadong
authors.initials: D
authors.lastname: Shao
authors.affiliation: School of Environment and Chemical Engineering, North China Electric Power University , Beijing 102206, People's Republic of China.|Institute of Plasma Physics, Chinese Academy of Sciences , P. O. Box 1126, 230031, Hefei, People's Republic of China.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Tan
authors.affiliation: Laboratory of Nuclear Energy Chemistry and Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100049, People's Republic of China.
authors.forename: Weiqun
authors.initials: W
authors.lastname: Shi
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences , P. O. Box 1126, 230031, Hefei, People's Republic of China.
authors.forename: Changlun
authors.initials: C
authors.lastname: Chen
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences , P. O. Box 1126, 230031, Hefei, People's Republic of China.
authors.forename: Jiaxing
authors.initials: J
authors.lastname: Li
authors.affiliation: Collaborative Innovation Center of Radiation Medicine, Jiangsu Higher Education Institutions , Jiangsu, People's Republic of China.|Laboratory of Nuclear Energy Chemistry and Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100049, People's Republic of China.
authors.forename: Zhifang
authors.initials: Z
authors.lastname: Chai
authors.affiliation: NAAM Research Group, Faculty of Science, King Abdulaziz University , Jeddah 21589, Saudi Arabia.|Department of Mathematics, Quaid-I-Azam University , Islamabad 44000, Pakistan.
authors.forename: Tasawar
authors.initials: T
authors.lastname: Hayat
authors.affiliation: School of Environment and Chemical Engineering, North China Electric Power University , Beijing 102206, People's Republic of China.|NAAM Research Group, Faculty of Science, King Abdulaziz University , Jeddah 21589, Saudi Arabia.|Collaborative Innovation Center of Radiation Medicine, Jiangsu Higher Education Institutions , Jiangsu, People's Republic of China.
authors.forename: Xiangke
authors.initials: X
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D002104:Cadmium; D006108:Graphite; D006863:Hydrogen-Ion Concentration; D010087:Oxides; D010710:Phosphates
chemical_list: D010087:Oxides; D010710:Phosphates; D002104:Cadmium; D006108:Graphite