Synergistic effects of 4-nitrophenol degradation using gamma irradiation combined with a advanced oxidation process |
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Affiliation: | 1. Department of Hydraulic Engineering, Tsinghua University,Beijing 100084, China;2. Collaborative Innovation Center for Advanced Nuclear Energy Technology, INET, Tsinghua University,Beijing 100084, China;Beijing Key Laboratory of Radioactive Waste Treatment,INET, Tsinghua University, Beijing 100084, China |
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Abstract: | The radiation-induced degradation of 4-nitrophenol(4-NP) was performed in combination with a Fenton reagent, H_2O_2, and Ti O_2 nanoparticles to investigate the synergetic effects of radiolytical degradation combined with other advanced oxidation processes. The experimental results indicated that the degradation efficiency of 4-NP was 87.5, 57.4, and 41.0 % at a dose of 20 k Gy when its initial concentration was 100, 200, and 350 mg/L, respectively. Radiation combined with H_2O_2, the Fenton method,and Ti O_2 remarkably increased the degradation efficiency of 4-NP, showing the synergetic effects. Radiation may enhance the biodegradability of 4-NP, suggesting that it has the potential to be used as a pretreatment method in combination with the biological method for the treatment of industrial wastewater containing toxic organic pollutants. Major intermediates during the 4-NP degradation process were identified and a possible degradation pathway was tentatively proposed. |
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Keywords: | Radiation degradation Nitrophenol Advanced oxidation processes Priority pollutant Synergistic effect |
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