Surface functionalized multi-wall carbon nanotubes for degradation of organic dyes

Shivakumar Jagadish Shetty, M. P. Shilpa, Saideep Shirish Bhat, K. S. Pavithra, Sudheer Moorkoth, Ashutosh Gupta, Srivathsava Surabhi, R. C. Shivamurthy, S. C. Gurumurthy

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Eliminating the hazardous dyes from the wastewater is essential for the sustainable furtherance of eco-friendly-oriented industrial growth. The untreated effluents containing dyes can damage the ecosystem and cause serious health issues to humans, animals, and aquatic species. In the present work, the multi-wall carbon nanotubes (MWCNTs) were functionalized using the combination of sulphuric acid and nitric acid. These functionalized multi-wall carbon nanotubes (F-MWCNTs) were characterized using Fourier transform infrared spectroscopy (FTIR) and energy dispersive X-ray analysis (EDAX) to confirm the presence of functional groups. The catalytic dye degradation efficiency of pristine multi-wall carbon nanotubes (P-MWCNTs) and F-MWCNTs was tested for methylene blue (MB), and indigo carmine (IC) dyes under dark and ultraviolet (UV) light exposure conditions. F-MWCNTs have exhibited appreciable degradation efficiency (∼90%) under dark and UV light compared to P-MWCNTs. An increment in efficiency was observed for UV-light-aided dye degradation. The impact of pH and temperature on degradation was analyzed in detail. The reaction kinetics was studied to determine the rate constants of the degradation reactions. A substantial quantum efficiency (QE) enhancement was noticed for F-MWCNTs compared to P-MWCNTs for both MB and IC degradation.

Original languageEnglish
Article number128566
JournalMaterials Chemistry and Physics
Publication statusPublished - 01-01-2024

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics


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