Hypothesis: Graphene nanosheet materials represent a potentially new high surface area sorbent for the
treatment of endocrine disrupting compounds (EDCs) in water. However, sorption behavior has been
reported only for laboratory graphene prepared by a laborious and hazardous graphite exfoliation process.
A careful examination of commercially available, clean, high-volume produced graphene materials
should reveal whether they are appropriate for sorbent technologies and which physicochemical properties
most influence sorption performance.
Experiments: In this study, three commercially available graphene oxide powders of various particle
sizes, specific surface areas, and surface chemistries were evaluated for their sorption performance using
carbamazepine and nine other EDCs and were compared to that of conventional granular activated
carbon (GAC) and multi-walled carbon nanotubes (MWCNTs).
Findings: Sorption kinetics of carbamazepine on graphene oxide powders was rapid and reversible with
alcohol washing, consistent with p–p interactions. The various sorption extents as described by Freundlich
isotherms were best explained by available surface area, and only the highest surface area graphene
oxide (771 m2
/g) out-performed GAC and MWCNTs. Increasing pH caused more negative surface charge,
a twofold decrease in sorption of anionic ibuprofen, a onefold increase in sorption of cationic atenolol,
and no change for neutral carbamazepine, highlighting the role of electrostatic interactions.
Hypothesis: Graphene nanosheet materials represent a potentially new high surface area sorbent for thetreatment of endocrine disrupting compounds (EDCs) in water. However, sorption behavior has beenreported only for laboratory graphene prepared by a laborious and hazardous graphite exfoliation process.A careful examination of commercially available, clean, high-volume produced graphene materialsshould reveal whether they are appropriate for sorbent technologies and which physicochemical propertiesmost influence sorption performance.Experiments: In this study, three commercially available graphene oxide powders of various particlesizes, specific surface areas, and surface chemistries were evaluated for their sorption performance usingcarbamazepine and nine other EDCs and were compared to that of conventional granular activatedcarbon (GAC) and multi-walled carbon nanotubes (MWCNTs).Findings: Sorption kinetics of carbamazepine on graphene oxide powders was rapid and reversible withalcohol washing, consistent with p–p interactions. The various sorption extents as described by Freundlichisotherms were best explained by available surface area, and only the highest surface area grapheneoxide (771 m2/g) out-performed GAC and MWCNTs. Increasing pH caused more negative surface charge,a twofold decrease in sorption of anionic ibuprofen, a onefold increase in sorption of cationic atenolol,และไม่เปลี่ยนแปลงสำหรับกลาง carbamazepine เน้นบทบาทของการโต้ตอบที่ไฟฟ้าสถิต
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