Improved sorption of perfluorooctanoic acid on carbon nanotubes hybridized by metal oxide nanoparticles

Research Article
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Abstract

Multi-walled carbon nanotubes (MWCNTs) are often used as adsorbent because of their strong adsorption capacity. However, due to the nature of MWCNTs, their ability to adsorb perfluorooctanoic acid (PFOA), a highly hydrophobic pollutant, is low. In this study, MWCNTs were modified by three nano metal oxides (nano iron oxide, copper oxide, and zinc oxide). The pristine (as the control) and modified MWCNTs were characterized by BET-N2, TEM, FTIR, XPS, and XRD, which showed that nano metal oxides were well hybridized on the surface of MWCNTs. Radioactive-labeled PFOA (14C-PFOA) was used to quantify it at trace level. Adsorption kinetics showed that intra-particle diffusion was the control step of PFOA adsorbing on metal oxides hybridized MWCNTs (MOHCNTs). Adsorption capacity of PFOA on the MOHCNTs was higher than that on the control due to electrostatic and hydrophobic interactions. In addition, PFOA formed inner-sphere complexes with metal oxide nanoparticles via ligand exchange. The alteration of PFOA adsorption capacity by increasing ionic strength was attributed to the aggregation degree of MWCNTs, electrostatic shielding, and/or salting out effect. The presence of Ca2+ increased the adsorption, owing to not only its higher electrostatic shielding ability than Na+ but also its formation of bridge between PFOA and MOHCNTs. PFOA adsorption on MOHCNTs strongly depended on medium pH value. These results provide an innovative approach for removing trace PFOA from liquid medium.

Keywords

Metal oxide nanoparticles Hybridized Carbon nanotubes Sorption PFOA 

Notes

Acknowledgments

This work was financially supported by the National Nature Science Foundation of China (Project No. 21377074) and Collaborative Fund between National Nature Science Foundation of China and Swiss National Science Foundation (Project No. 21661132004). We also thanked Dr. Bin Gao, Florida University to improve English in the manuscript.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

11356_2018_1728_MOESM1_ESM.docx (3.1 mb)
ESM 1 (3206 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and EnvironmentShandong Agricultural UniversityTai’anChina
  2. 2.State Key Laboratory of Pollution Control and Resource Reuse, School of the EnvironmentNanjing UniversityNanjingChina

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