期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 302, 期 -, 页码 137-143出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2015.09.029
关键词
In situ chemical reduction (ISCR); Vitamin C; Soil and groundwater remediation; Chlorinated solvents; Explosive
资金
- Taiwan EPA
Alkaline ascorbic acid (AA) exhibits the potential to reductively degrade nitrobenzene (NB), which is the simplest of the nitroaromatic compounds. The nitro group (NO2-) of NB has a +III oxidation state of the N atom and tends to gain electrons. The effect of alkaline pH ranging from 9 to 13 was initially assessed and the results demonstrated that the solution pH, when approaching or above the pK(a2) of AA (11.79), would increase reductive electron transfer to NB. The rate equation for the reactions between NB and AA at pH 12 can be described as r=((0.89 +/- 0.11) x 10(-4) mM(1-(a+b)) h(-1) x [NB](a=1.35 +/- 0.10) [AA](b=0.89 +/- 0.01). The GC/MS analytical method identified nitrosobenzene,azoxybenzene, and azobenzene as NB reduction intermediates, and aniline (AN) as a final product. These experimental results indicate that the alkaline AA reduction of NB to AN mainly proceeds via the direct route, consisting of a series of two-electron or four-electron transfers, and the condensation reaction plays a minor route. Preliminary evaluation of the remediation of spiked NB contaminated soils revealed that maintenance of alkaline pH and a higher water to soil ratio are essential for a successful alkaline AA application. (C) 2015 Elsevier B.V. All rights reserved.
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