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| Kinetic and mechanistic effects of NO2- on the degradation of 4-chloro-3,5-dimethylphenol in water by ferrate |
| LU Ying, YAO Bin-bin, YANG Pei-zeng, JI Yue-fei, CHEN Jing, LU Jun-he |
| Department of Environmental Science and Engineering, Nanjing Agricultural University, Nanjing 210095, China |
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Abstract We investigated the impact of NO2- on degradation efficiency, products, and toxicity of 4-chloro-3,5-dimethylphenol (PCMX) during ferrate (Fe(VI)) oxidation. Results demonstrated that Fe(VI) effectively degraded PCMX in water within the pH range of 7~9, achieving a 100% removal in 5minutes with a [Fe(VI)]:[PCMX] ratio of 10:1. The presence of 0.1~10mg/L humic acid (HA) significantly enhanced PCMX degradation. The addition of NO2- inhibited the reaction, and resulted in the formation of various nitrated byproducts. Quenching experiments indicated that high-valent iron species play a key role in this process. Toxicity assessment suggested that these nitrated byproducts and coupling products exhibited prolonged persistence and biotoxicity. For example, OP-6 and OP-7 have half-lives exceeding 180 days, bioaccumulation factors greater than 5000, and chronic toxicity values less than 1mg/L, which may pose certain environmental risks.
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Received: 02 March 2024
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