Degradation of trace nitrobenzene in water by microwave-enhanced H<sub>2</sub>O<sub>2</sub>-based process

doi:10.1007/s11783-012-0395-x

Front Envir Sci Eng

2012, Vol. 6

Issue (4) : 477-483 https://doi.org/10.1007/s11783-012-0395-x

RESEARCH ARTICLE

Degradation of trace nitrobenzene in water by microwave-enhanced H₂O₂-based process

Honghu ZENG¹(

), Lanjing LU^1,2, Meina LIANG¹, Jie LIU¹, Yanghong LI¹

1. College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China; 2. Guangxi Polytechnic of Construction, Nanning 530003, China

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Abstract

To evaluate possible use of microwave-enhanced H₂O₂-based (MW/H₂O₂) process to degrade trace nitrobenzene (NB) in water, a series of batch experiments were conducted. The results showed that 2450MHz microwave irradiation significantly enhanced oxidative decomposition of nitrobenzene (NB) in a H₂O₂ system. About 90% NB was degraded by the MW/ H₂O₂ process in 30 min. Moreover, the MW/ H₂O₂ process could enhanced the oxidative degradation of NB even at relatively low temperature (50°C). When the initial concentration of NB was 300μg/L, the optimum ratio of H₂O₂ to NB and MW power were 70 and 300 W respectively. The presence of humic acid significantly increased H₂O₂ dosage. The ultraviolet absorbance at 254 nm (UV₂₅₄) indicated degradation of NB was stepwise and some intermediates were produced. The gas chromatography-mass spectrometric (GC-MS) analysis showed that main intermediates were nitrophenolic and carbonyl compounds.

Keywords microwave hydrogen peroxide nitrobenzene humic acid

Corresponding Author(s): ZENG Honghu,Email:zenghonghu@glite.edu.cn

Issue Date: 01 August 2012

Cite this article:

Lanjing LU,Meina LIANG,Jie LIU, et al. Degradation of trace nitrobenzene in water by microwave-enhanced H₂O₂-based process[J]. Front Envir Sci Eng, 2012, 6(4): 477-483.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-012-0395-x
https://academic.hep.com.cn/fese/EN/Y2012/V6/I4/477

Fig.1 Schematic diagram of experiment equipment. 1-microwave oven; 2-three-neck flask; 3-cooler; 4-thermocouple; 5-3 way valve; 6-recycle pump; 7-rotameter

Fig.2 Degradation of NB by different processes

Fig.3 Effect of MW power on the removal of NB with an initial concentration of 300 μg·L NB and 20 mg·L HO

Fig.4 Effect of initial concentration radio of HO to NB on the removal of NB with an initial concentration of NB of 300 μg·L and MW power of 300 W

Fig.5 Dependence of NB removal on reaction time under different dosage of HO at the presence of humic acid (the MW power of 300 W and the initial concentration of NB of 300 μg·L)

Fig.6 Dependence of UV on reaction time under different dosage of HO (the water background TOC of 7.983 mg·L, the MW power of 300 W and the initial concentration of NB of 300 μg·L)

Tab.1 Identified products and main fragments determined by GC-MS

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