Enhanced Ozonation of P-Chloronitrobenzene in Aqueous Solution Using Nanometer CuO Powders

Abstract:

Heterogeneous catalytic ozonation for the degradation of p-chloronitrobenzene (pCNB) in aqueous soloution was investigated in presence of copper oxide (CuO) nanoparticles prepared by the precipitation method. The average diameter of CuO nanoparticles was 26.8nm, with a specific surface area of 10.2580m²/g and average pore diameter of 7.53nm. The presence of CuO nanoparticles in ozonation enhanced the degradation efficiency as compared to ozonation alone. Typical operating parameters like catalyst dosage, initial reaction temperature and initial pH exerted a positive influence on the pCNB degradation. Both tert-butyl alcohol test and spin-trapping/electron spin resonance (EPR) technique confirmed that the degradation of pCNB followed a radical-type mechanism during ozonation. Density functional theory (DFT) calculation indicated that an ozone molecule interacted with the surfaces of CuO nanoparticles where hydroxyl radicals (OH) were generated with a quantitative and qualitative discussion. Based on these observations, it was suggested that CuO nanoparticles accelerated the initiation of OH derived from the catalytic decomposition of ozone, resulting in the enhancement degradation of pCNB.

• Periodical: Advanced Materials Research (Volumes 807-809)
• Pages: 2675-2678
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.807-809.2675
• Online since: September 2013
• Authors: Tao Jiang*, Jun Guo He, Xiao Nan Yang, Jian Zheng Li
• Keywords: Catalytic Ozonation, Nano-CuO, pCNB

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