Destruction of methyl bromide sorbed to activated carbon by thiosulfate or electrolysis

Environmental Science & Technology
Yu YangWilliam A Mitch

Abstract

Methyl bromide (CH3Br) is widely used as a fumigant for postharvest and quarantine applications for agricultural products at port facilities due to the short treatment period required, but it is vented from fumigation chambers to the atmosphere after its use. Due to the potential contributions of CH3Br to stratospheric ozone depletion, technologies for the capture and degradation of the CH3Br are needed to enable its continued use. Although granular activated carbon (GAC) has been used for CH3Br capture and thiosulfate has been used for destruction of CH3Br in aqueous solution, this research explored techniques for direct destruction of CH3Br sorbed to GAC. Submerging the GAC in an aqueous thiosulfate solution achieved debromination of CH3Br while sorbed to the GAC, but it required molar concentrations of thiosulfate because of the high CH3Br loading and produced substantial concentrations of methyl thiosulfate. Submergence of the GAC in water and use of the GAC as the cathode of an electrolysis unit also debrominated sorbed CH3Br. The reaction appeared to involve a one-electron transfer, producing methyl radicals that incorporated into the GAC. Destruction rates increased with decreasing applied voltage down to ∼-1.2 V vs the ...Continue Reading

References

Jul 20, 2006·Journal of Agricultural and Food Chemistry·S BondarenkoJ Gan
Apr 16, 2008·Environmental Science & Technology·Jerome M KemperWilliam A Mitch
Aug 14, 2010·Environmental Science & Technology·Wenqing XuWilliam A Mitch
Mar 1, 1994·Environmental Science & Technology·R S OremlandF E Strohmaier
Jan 24, 2012·Water Research·Jelena RadjenovićJurg Keller
Feb 12, 2015·Environmental Science & Technology·Wenqing XuWilliam A Mitch
Sep 1, 1997·Plant Disease·Jean Beagle Ristaino, William Thomas

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