DocumentCode :
2505618
Title :
Effect of pH on Reduction of Nitrobenzene in Groundwater by Zero-Valent Iron
Author :
Liu, Lei ; Yin, Jun ; Zhang, Liguo ; Lu, Guoxiao
Author_Institution :
Coll. of Environ. Sci. & Eng., South China Univ. of Technol., Guangzhou, China
fYear :
2009
fDate :
11-13 June 2009
Firstpage :
1
Lastpage :
4
Abstract :
The effects of different pH values on the reduction of nitrobenzene (NB or ArNO2) by zero-valent iron (ZVI) were studied in groundwater through batch experiments. The concentrations of NB and its reduction product aniline were determined during the process of reaction. The changes in the reduction rates for nitrobenzene, the quantities of aniline formed, and the reaction kinetics during the reduction by ZVI were examined and analyzed at different pH values. Experimental results showed that nitrobenzene in groundwater could be reductively degraded effectively by ZVI. The optimum pH for the reduction was found to be 3.0 within the tested pH range of 3.0 to 12.0. The pH value tended to increase gradually with the progress of reduction reaction. At various pH values, the reduction of nitrobenzene by ZVI followed pseudo-first-order kinetics, and the observed kinetic constant kobs increased with decreasing pH. Both the reduction rate of nitrobenzene and the formation of aniline decreased with increasing pH. According to UV spectral and GC-MS analyses, aniline was the final reaction product of NB when reduced by zero-valent iron.
Keywords :
batch processing (industrial); chromatography; environmental degradation; groundwater; mass spectroscopic chemical analysis; organic compounds; pH; reaction kinetics; reduction (chemical); spectral analysis; ultraviolet spectra; water treatment; GC-MS analysis; UV spectral analysis; aniline formation; groundwater; kinetic constant; nitrobenzene reduction; pH effect; pseudofirst-order kinetics; reaction kinetics; reduction reaction; zero-valent iron; Chemical industry; Chemical products; Chemical technology; Degradation; Electrons; Iron; Kinetic theory; Niobium; Pollution measurement; Powders;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Bioinformatics and Biomedical Engineering , 2009. ICBBE 2009. 3rd International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2901-1
Electronic_ISBN :
978-1-4244-2902-8
Type :
conf
DOI :
10.1109/ICBBE.2009.5162709
Filename :
5162709
Link To Document :
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