Advanced oxidation and reduction process chemistry of methyl tert-butyl ether (MTBE) reaction intermediates in aqueous solution: 2-Methoxy-2-methyl-propanal, 2-methoxy-2-methyl-propanol, and 2-methoxy-2-methyl-propanoic acid

作者：Mezyk Stephen P^*; Hardison D Rance; Song Weihua; O'; Shea Kevin E; Bartels David M; Cooper William J

来源：Chemosphere, 2009, 77(10): 1352-1357.

DOI：10.1016/j.chemosphere.2009.09.029

• MTBE
• AOP degradation
• Radical kinetics
• Hydroxyl radical
• Oxidation
• Reduction

Absolute rate constants for the reaction of three important degradation products of methyl-tert-butyl ether (MTBE) with the hydroxyl radical, hydrated electron and hydrogen atom were determined in aqueous solution at room temperature. These three intermediate species; 2-methoxy-2-methyl propanal (MMP), 2-methoxy-2-methyl-propanol (MMP-OH) and 2-methoxy-2-methyl-propionic acid (MMP-acid), are formed in the degradation of MTBE under advanced oxidation and reduction process conditions. The rate constants for their hydroxyl radical oxidation of (3.99 +/- 0.29) x 10(9), (8.02 +/- 0.53) x 10(8), and (7.73 +/- 0.48) x 10(8) M(-1) s(-1), respectively, show that this reaction would be the overall dominant degradation pathway for these three compounds, relative to their corresponding hydrated electron reduction values of (3.11 +/- 0.32) x 10(7), (7.8 +/- 1.8) x 10(6) and (1.40 +/- 0.10) x 10(9) M(-1) s(-1), and hydrogen atom rate constants of (1.65 +/- 0.14) x 10(7), (1.30 +/- 0.13) x 10(8) and < 1.2 x 10(6) M(-1) s(-1).

• 出版日期2009-11