Sorption and Desorption Analysis of Nitrobenzene on Differently Functionalized Multiwalled Carbon Nanotubes and Implications on the Stability
1
Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
2
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Academic Editor: José Alberto Herrera-Melián
Water 2021, 13(10), 1426; https://doi.org/10.3390/w13101426
Received: 22 April 2021
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Revised: 15 May 2021
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Accepted: 17 May 2021
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Published: 20 May 2021
(This article belongs to the Section Water Quality and Contamination)
The stability of carbon nanotubes (CNTs) suspension is a key factor in determining their transport, fate, and toxicity in an aquatic environment, which is significantly influenced by CNTs’ nature and water chemistry. Macromolecular dissolved organic matter (DOM) is reported to influence the stability of CNTs aggregation. However, little is known on small polar dissolved organic compound’s effects on CNTs aggregation. Nitrobenzene was selected to investigate its interaction with three different functionalized multiwalled CNTs (MWCNTs). Both the stability of CNTs aggregation and sorption hysteresis were affected by the initial concentration of nitrobenzene and the surface functionalization coverage of MWCNTs. At the initial concentration below 580 mg/L, the thermodynamic index of irreversibility (TII) and turbidity of CNTs suspension had the same tendency, indicating that the underlying mechanism is closely related. A conceptual adsorption–desorption model was proposed to further explain the relationship between the sorption hysteresis and stability of MWCNTs suspension under different initial concentrations of nitrobenzene. This provided data support to further clarify the environmental behaviors and risks of CNTs.
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Keywords:
stability of aggregation; sorption and desorption; sorption hysteresis; nitrobenzene; multiwalled carbon nanotubes (MWCNTs)
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MDPI and ACS Style
Ji, Z.; Li, D. Sorption and Desorption Analysis of Nitrobenzene on Differently Functionalized Multiwalled Carbon Nanotubes and Implications on the Stability. Water 2021, 13, 1426. https://doi.org/10.3390/w13101426
AMA Style
Ji Z, Li D. Sorption and Desorption Analysis of Nitrobenzene on Differently Functionalized Multiwalled Carbon Nanotubes and Implications on the Stability. Water. 2021; 13(10):1426. https://doi.org/10.3390/w13101426
Chicago/Turabian StyleJi, Zhanhua, and Dengyu Li. 2021. "Sorption and Desorption Analysis of Nitrobenzene on Differently Functionalized Multiwalled Carbon Nanotubes and Implications on the Stability" Water 13, no. 10: 1426. https://doi.org/10.3390/w13101426
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