title: Graphene-polypyrrole nanocomposite as a highly efficient and low cost electrically switched ion exchanger for removing ClO₄⁻ from wastewater.
abstract: Perchlorate (ClO(4)(-)) contamination is a widespread concern affecting water utilities. In the present study, functionalized graphene sheets were employed as the scaffold to synthesize a novel graphene-polypyrrole (Ppy) nanocomposite, which served as an excellent electrically switched ion exchanger for perchlorate removal. Scanning electron microscopy and electrochemical measurements showed that the 3D nanostructured graphene-Ppy nanocomposite exhibited a significantly improved uptake capacity for ClO(4)(-) compared with Ppy film alone. X-ray photoelectron spectroscopy confirmed the uptake and release process of ClO(4)(-) in graphene-Ppy nanocomposite. In addition, the presence of graphene substrate resulted in high stability of graphene-Ppy nanocomposite during potential cycling. The present work provides a promising method for large scale water treatment.
authors.affiliation: Pacific Northwest National Laboratory, Richland, Washington 99352, United States.
authors.forename: Sheng
authors.initials: S
authors.lastname: Zhang
authors.forename: Yuyan
authors.initials: Y
authors.lastname: Shao
authors.forename: Jun
authors.initials: J
authors.lastname: Liu
authors.forename: Ilhan A
authors.initials: IA
authors.lastname: Aksay
authors.forename: Yuehe
authors.initials: Y
authors.lastname: Lin
mesh_terms: D055664:Electrochemical Techniques; D006108:Graphite / Q000737:chemistry*; D007474:Ion Exchange; D053761:Nanocomposites / Q000737:chemistry*; D010472:Perchlorates / Q000737:chemistry / Q000302:isolation & purification*; D056951:Photoelectron Spectroscopy; D011108:Polymers / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D010472:Perchlorates; D011108:Polymers; D011758:Pyrroles; D014874:Water Pollutants, Chemical; C067635:polypyrrole; D006108:Graphite; C494474:perchlorate