Hydrophobic‐Force‐Driven Removal of Organic Compounds from Water by Reduced Graphene Oxides Generated in Agarose Hydrogels

Hydrophobic reduced graphene oxides (rGOs) were generated in agarose hydrogel beads (AgarBs) by NaBH4 reduction of graphene oxides (GOs) initially loaded in the AgarBs. The resulting rGO‐loaded AgarBs were able to effectively adsorb organic compounds in water as a result of the attractive hydrophobi...

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Bibliographic Details
Published in:Angewandte Chemie 2018-08, Vol.130 (35), p.11347-11351
Main Authors: Cheng, Chongling, Cai, Yongqing, Guan, Guijian, Yeo, Leslie, Wang, Dayang
Format: Article
Language:English
Subjects:
Abwasserbehandlung
Adsorption
Aspirin
Beads
Chemistry
Graphene
Hydrogele
Hydrogels
Hydrophobe Kräfte
Hydrophobicity
Organic compounds
Oxides
Reduziertes Graphenoxid
Rhodamine
Wastewater treatment
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Summary:Hydrophobic reduced graphene oxides (rGOs) were generated in agarose hydrogel beads (AgarBs) by NaBH4 reduction of graphene oxides (GOs) initially loaded in the AgarBs. The resulting rGO‐loaded AgarBs were able to effectively adsorb organic compounds in water as a result of the attractive hydrophobic force between the rGOs in the AgarBs and the organic compounds dissolved in aqueous media. The adsorption capacity of the rGOs was fairly high even toward reasonably water‐soluble organic compounds such as rhodamine B (321.7 mg g−1) and aspirin (196.4 mg g−1). Yet they exhibited salinity‐enhanced adsorption capacity and preferential adsorption of organic compounds with lower solubility in water. Such peculiar adsorption behavior highlights the exciting possibility for adopting an adsorption strategy, driven by hydrophobic forces, in practical wastewater treatment processes. Reines Wasser: Hydrophobes reduziertes Graphenoxid (rGO) wird in Agarosehydrogel‐Kügelchen eingelagert, um organische Verbindungen durch hydrophobe Anziehung und Adsorption aus Wasser zu entfernen. Die Effizienz dieses Prozesses hängt stark von der Löslichkeit der organischen Verbindungen in Wasser ab, und sie steigt mit zunehmendem Salzgehalt des wässrigen Mediums.
ISSN:0044-8249
1521-3757
DOI:10.1002/ange.201803834