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J Hazard Mater. 2016 Jun 5;310:226-34. doi: 10.1016/j.jhazmat.2016.02.049. Epub 2016 Feb 24.

Microwave-induced carbon nanotubes catalytic degradation of organic pollutants in aqueous solution.

Author information

1
School of Environment Science, Liaoning University, Shenyang 110036, China.
2
School of Environment Science, Liaoning University, Shenyang 110036, China. Electronic address: lnuhjhx@163.com.
3
Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, OH 45221-0012, USA. Electronic address: dionysios.d.dionysiou@uc.edu.

Abstract

In this study, a new catalytic degradation technology using microwave induced carbon nanotubes (MW/CNTs) was proposed and applied in the treatment of organic pollutants in aqueous solution. The catalytic activity of three CNTs of 10-20nm, 20-40nm, and 40-60nm diameters were compared. The results showed that organic pollutants such as methyl orange (MO), methyl parathion (MP), sodium dodecyl benzene sulfonate (SDBS), bisphenol A (BPA), and methylene blue (MB) in aqueous solution could be degraded effectively and rapidly in MW/CNTs system. CNTs with diameter of 10-20nm exhibited the highest catalytic activity of the three CNTs under MW irradiation. Further, complete degradation was obtained using 10-20nm CNTs within 7.0min irradiation when 25mL MO solution (25mg/L), 1.2g/L catalyst dose, 450W, 2450MHz, and pH=6.0 were applied. The rate constants (k) for the degradation of SDBS, MB, MP, MO and BPA using 10-20nm CNTs/MW system were 0.726, 0.679, 0.463, 0.334 and 0.168min(-1), respectively. Therefore, this technology may have potential application for the treatment of targeted organic pollutants in wastewaters.

KEYWORDS:

Advanced oxidation; Carbon nanotube; Degradation; Microwave; Organic pollutant

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