Comparative study of acid functionalization of carbon nanotube via ultrasonic and reflux mechanism

Lau, Yien Jun and Mubarak, N. M. and Lau, Sie Yon and Chua, Han Bing and Khalid, Mohammad * and Abdullah, E. C. (2018) Comparative study of acid functionalization of carbon nanotube via ultrasonic and reflux mechanism. Journal of Environmental Chemical Engineering, 6 (5). pp. 5889-5896. ISSN 2213-3437

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Multi-walled carbon nanotubes (MWCNTs) have a great potential in wide applications due to their extraordinary physical, thermal and mechanical properties. However, the known shortcomings, such as hydrophobic nature, poor solubility and dispersibility in most solvents have impeded the technology to further develop. In the present study, various types of acid functionalized MWNCTs (f-MWCNTs) samples were prepared. The investigated process parameters include type of acids, acid concentrations, treatment methods, operating temperature and treatment duration. The f-MWCNTs were characterized using Fourier Transform Infrared Spectroscopy (FTIR), Energy dispersive X-ray (EDX), Field Emission Scanning Electron Microscopy (FESEM) and Zetasizer. The optimum conditions for acid functionalization of MWCNTs were achieved by dispersing MWCNTs in concentrated nitric and sulfuric acid mixture (1:3 v/v ratio), via ultrasonication treatment method at 40 °C for 2.5 h. EDX analysis also revealed that, 21.36 wt% of oxygenated functional groups, with no strong detection of inorganic and metal impurities. In addition, FESEM results also revealed that there is no any severe structural damage on the surface. Acid functionalization of MWCNTs via ultrasonic bath methods is more desirable than reflux method as it can result in high yields of MWCNTs with high density of oxygenated functional groups and minimum structural destruction on the surface of MWCNTs.

Item Type: Article
Uncontrolled Keywords: MWCNT; acid functionalization; ultrasonic bath; reflux; characterization
Subjects: T Technology > TP Chemical technology
Divisions: Others > Non Sunway Academics
Sunway University > School of Engineering and Technology [formerly School of Science and Technology until 2020] > Research Centre for Nano-Materials and Energy Technology
Depositing User: Dr Janaki Sinnasamy
Related URLs:
Date Deposited: 10 Dec 2018 06:19
Last Modified: 25 Apr 2019 07:44

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