General Information
    • ISSN: 2010-0221
    • Frequency: Bimonthly
    • DOI: 10.18178/IJCEA
    • Editor-in-Chief: Prof. Dr. Shen-Ming Chen
    • Executive Editor: Mr. Ron C. Wu
    • Abstracting/ Indexing: Chemical Abstracts Services (CAS), Ulrich's Periodicals Directory, CABI, Electronic Journals Library, Google Scholar, ProQuest, and Crossref
    • E-mail: ijcea@ejournal.net
  • Aug 27, 2018 News! Vol.9, No.4 has been published with online version. 8 peer reviewed papers are published in this issue.   [Click]
  • May 30, 2018 News! Vol.9, No.3 has been published with online version. 6 peer reviewed papers are published in this issue.   [Click]
Editor-in-chief
Prof. Dr. Shen-Ming Chen
National Taipei University of Technology, Taiwan
 

IJCEA 2018 Vol.9(4): 119-122 ISSN: 2010-0221
doi: 10.18178/ijcea.2018.9.4.710

Destruction of Polychlorinated Biphenyls under Subcritical Water Conditions in the Presence of Hydrogen Peroxide or Sodium Hydroxide

Ninad Doctor and Yu Yang
Abstract—Polychlorinated biphenyls (PCBs) are toxic pollutants that need to be cleaned and removed from our environment. In this work we have investigated the destruction of PCBs using microwave heating, conventional heating PCBs in water-hydrogen peroxide or water-sodium hydroxide systems. After heating, liquid-liquid extraction of the reaction mixtures was conducted prior to GC analysis. Our results revealed that the degradation efficiency obtained by microwave heating ranged from 18% to 53%. Fortunately, PCB-118, PCB-156, and PCB-180 congeners were effectively degraded in subcritical water with hydrogen peroxide or sodium hydroxide. Higher concentration of hydrogen peroxide and longer heating time increased PCB degradation. Over 91% PCB degradation was achieved for all three PCB congeners after 6 hours of heating at 350 °C with 30% hydrogen peroxide in water. The concentration of sodium hydroxide in water had only a mild influence on PCB degradation. However, high temperature significantly enhanced the efficiency of PCB degradation in water-sodium hydroxide system. All three PCB congeners investigated were completely destroyed after heating in 0.2% sodium hydroxide at 350 °C for an hour.

Index Terms—Polychlorinated biphenyls, PCBs, destruction, subcritical water, hydrogen peroxide, sodium hydroxide.

The authors are with the Department of Chemistry, East Carolina University, Greenville, North Carolina, USA (e-mail: YANGY@ecu.edu).

[PDF]

Cite: Ninad Doctor and Yu Yang, "Destruction of Polychlorinated Biphenyls under Subcritical Water Conditions in the Presence of Hydrogen Peroxide or Sodium Hydroxide," International Journal of Chemical Engineering and Applications vol. 9, no. 4, pp. 119-122, 2018.

Copyright © 2008-2015. International Journal of Chemical Engineering and Applications. All rights reserved
E-mail: ijcea@ejournal.net