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Scalable Syntheses of Graphene Oxide and Reduced Graphene Oxide using Cascade Design Oxidation and Highly Basic Reduction Reactions
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Norfloxacin and Bisphenol-A Removal Using Temperature-Switchable Graphene Oxide
Na Yao1, Xuntong Zhang1, Zhen Yang1,2
1School of Chemistry and Materials Science, Jiangsu Provincial Key Laboratory of Material Cycling and Pollution Control , Nanjing Normal University , Nanjing 210023 , China.
ACS Applied Materials & Interfaces
|August 8, 2018
Summary
Modified graphene oxide (P-GO) exhibits temperature-responsive adsorption of emerging organic contaminants (EOCs). This innovation facilitates efficient water purification and adsorbent regeneration using only temperature changes and water.
Area of Science:
- Environmental Science
- Materials Science
- Chemistry
Background:
- Graphene oxide (GO) is effective for removing emerging organic contaminants (EOCs) from water.
- GO's tendency to aggregate and difficulty in regeneration limit its practical application.
- Developing advanced GO-based adsorbents is crucial for efficient water treatment.
Purpose of the Study:
- To synthesize a modified graphene oxide (P-GO) with temperature-switchable properties.
- To investigate the adsorption behavior of P-GO for different EOCs at varying temperatures.
- To demonstrate the regeneration capability of P-GO for sustainable water purification.
Main Methods:
- Grafting temperature-responsive poly(N-n-propylacrylamide) onto graphene oxide to create P-GO.
- Adsorption experiments using model contaminants norfloxacin (NOR) and bisphenol A (BPA) at different temperatures.
- Analysis of interfacial binding interactions (π-π, H-bonding, hydrophobic association).
Main Results:
- P-GO displayed temperature-dependent hydrophilicity/hydrophobicity, optimizing adsorption for both hydrophilic (NOR) and hydrophobic (BPA) contaminants.
- P-GO showed comparable NOR adsorption via site replacement and enhanced BPA adsorption through hydrophobic interactions.
- Effective adsorbent regeneration was achieved using temperature control and water elution, avoiding additional chemicals.
Conclusions:
- P-GO offers a promising solution for EOC removal with tunable adsorption properties.
- Temperature-responsive regeneration minimizes secondary pollution and enables contaminant recovery.
- This study advances the development of sustainable and efficient water treatment technologies.
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