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Water-enhanced Removal of Ciprofloxacin from Water by Porous Graphene Hydrogel.

Ma J, Yang M, Yu F, Zheng J - Sci Rep (2015)

Bottom Line: An environmentally benign and efficient hydrothermal reduction method was applied for the preparation of three-dimensional (3D) porous graphene hydrogel (GH) adsorbents.The GO hydrogels exhibited an excellent adaptability to environmental factors.These findings demonstrate that GH granules are promising adsorbents for the removal of antibiotic pollutants from aqueous solutions.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, P. R. of China.

ABSTRACT
An environmentally benign and efficient hydrothermal reduction method was applied for the preparation of three-dimensional (3D) porous graphene hydrogel (GH) adsorbents. The physicochemical properties of GH granules were systematically characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectra and Brunauer-Emmett-Teller (BET) method. GH granules showed an excellent adsorption capacity (235.6 mg/g) for ciprofloxacin via combined adsorption interaction mechanisms (e.g. π-π EDA interaction, hydrogen bonding, and hydrophobic interaction). Moreover, reducing the size of the hydrogels can significantly accelerate the adsorption process and enhance the removal efficiency of pollutants from aqueous solution. Water (more than 99 wt%) within hydrogels played a key role in enhancing adsorption performance. The GO hydrogels exhibited an excellent adaptability to environmental factors. These findings demonstrate that GH granules are promising adsorbents for the removal of antibiotic pollutants from aqueous solutions.

No MeSH data available.


Adsorption capacity comparison (a) of GH granules in different solvents, and adsorption removal mechanism (b) of ciprofloxacin by GH granules.
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f6: Adsorption capacity comparison (a) of GH granules in different solvents, and adsorption removal mechanism (b) of ciprofloxacin by GH granules.

Mentions: In order to investigate the ciprofloxacin adsorption mechanism of GH granules, comparative trials were designed by using methanol and ethanol as solvents, respectively and the GH granules synthesized above were soaked in either methanol or ethanol to replace water. Comparative trial results were shown in Fig. 6a. Hydrogels in water showed much higher adsorption capacity than other conditions, while hydrogels in methanol adsorbed more contaminants than in ethanol. The large adsorption difference can be attributed to the significant role of water in the adsorption process. Firstly, alcohol solvents can not provide strong hydrophobic interactions between the carbon surface and ciprofloxacin. Besides, water contains more hydrogen bonds to associate with ciprofloxacin than other solvents.


Water-enhanced Removal of Ciprofloxacin from Water by Porous Graphene Hydrogel.

Ma J, Yang M, Yu F, Zheng J - Sci Rep (2015)

Adsorption capacity comparison (a) of GH granules in different solvents, and adsorption removal mechanism (b) of ciprofloxacin by GH granules.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4559748&req=5

f6: Adsorption capacity comparison (a) of GH granules in different solvents, and adsorption removal mechanism (b) of ciprofloxacin by GH granules.
Mentions: In order to investigate the ciprofloxacin adsorption mechanism of GH granules, comparative trials were designed by using methanol and ethanol as solvents, respectively and the GH granules synthesized above were soaked in either methanol or ethanol to replace water. Comparative trial results were shown in Fig. 6a. Hydrogels in water showed much higher adsorption capacity than other conditions, while hydrogels in methanol adsorbed more contaminants than in ethanol. The large adsorption difference can be attributed to the significant role of water in the adsorption process. Firstly, alcohol solvents can not provide strong hydrophobic interactions between the carbon surface and ciprofloxacin. Besides, water contains more hydrogen bonds to associate with ciprofloxacin than other solvents.

Bottom Line: An environmentally benign and efficient hydrothermal reduction method was applied for the preparation of three-dimensional (3D) porous graphene hydrogel (GH) adsorbents.The GO hydrogels exhibited an excellent adaptability to environmental factors.These findings demonstrate that GH granules are promising adsorbents for the removal of antibiotic pollutants from aqueous solutions.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, P. R. of China.

ABSTRACT
An environmentally benign and efficient hydrothermal reduction method was applied for the preparation of three-dimensional (3D) porous graphene hydrogel (GH) adsorbents. The physicochemical properties of GH granules were systematically characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectra and Brunauer-Emmett-Teller (BET) method. GH granules showed an excellent adsorption capacity (235.6 mg/g) for ciprofloxacin via combined adsorption interaction mechanisms (e.g. π-π EDA interaction, hydrogen bonding, and hydrophobic interaction). Moreover, reducing the size of the hydrogels can significantly accelerate the adsorption process and enhance the removal efficiency of pollutants from aqueous solution. Water (more than 99 wt%) within hydrogels played a key role in enhancing adsorption performance. The GO hydrogels exhibited an excellent adaptability to environmental factors. These findings demonstrate that GH granules are promising adsorbents for the removal of antibiotic pollutants from aqueous solutions.

No MeSH data available.