Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 284, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2021.120305
Keywords
Layered hydroxides; Coagulation; Graphene oxide; Secondary applications; Emerging contaminants
Categories
Funding
- National Natural Science Foundation of China [21671072]
- National Key R&D Program of China [2018YFC1802302]
- Fundamental Research Funds for the Central Universities [2019kfyRCPY058]
- Chutian Scholar Foundation from Hubei province
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This study developed Fe-based hydroxides with different interlayers anions for efficient removal of graphene oxide (GO). The designed material showed high removal capacity and tolerance to high concentration environments. This work provides guidance for environmental remediation and potential development of new materials.
The extensive use and inevitable release of graphene oxide (GO) to the environment have increased the threat of its exposure to living organisms. This study reports the design of Fe-based hydroxides with different interlayers anions, i.e., Cl-, SO42-, CO32-, and NO3- to capture GO from an aqueous medium. Various characterization techniques, including X-ray diffraction (XRD), Fourier transform infrared (FTIR), and scanning electron microscopy (SEM), confirmed the successful synthesis of these different materials. The Fe-hydroxides as Fe-HO/(NO3) with NO3- interlayers anions effectively removed up to 190 mg/g GO and was tolerant to a high concentration of background electrolyte, different anions, and increasing ionic strength. These remarkable features of Fe-HO/(NO3) originated from the weak bonding abilities of interlayers NO3- anions that facilitated simple self exfoliation of hydroxide nanosheets, and thus promoted the electrostatic interactions between the positively charged layers of hydroxides and negatively charged GO particles. The coagulated end product (Fe-HO/(NO3) @GO can be further used in advanced oxidation processes (AOPs) as catalyst or adsorbent for the treatment of different pollutants. We believe that this work not only explains the positive aspect of regulating anions in the hydroxides layers but also provides a direction to develop new materials for environmental remediation.
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