Zeng Yiting, Zeng Jin, Luo Zhenwei, Pan Jiahao, Luo Yuxia, Liu Jun, Wang Chunying
Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Jiangxi University of Science and Technology, Ganzhou, 341000, China.
Environ Sci Pollut Res Int. 2023 Feb;30(9):22284-22295. doi: 10.1007/s11356-022-23658-6. Epub 2022 Oct 26.
Bromate (BrO) and ammonia nitrogen (NH) are both typical environmental pollutants: BrO has been categorized as one of the Group 2B carcinogen by IARC; an excess of NH might result in the eutrophication of water. The existence of NH could inhibit the transformation of bromide (Br) to bromate (BrO). However, the interaction of NH and BrO during the removal process is not clear. This study intends to disclose the mutual relationships of ammonia nitrogen and bromate ions under UV irradiation or UV/TiO conditions. Without UV irradiation, BrO and NH were both stable even under the presentation of each other. Under UV irradiation or UV/TiO conditions, BrO and NH promoted the degradation of each other, showing the synergistic degradation mechanism. In the neutral environment, both of BrO and NH could be transformed effectively. Furthermore, NH accelerated the transformation of BrO to Br at the reaction beginning and the existence of BrO is beneficial for the transformation of NH to N.
溴酸盐（BrO₃⁻）和氨氮（NH₃-N）都是典型的环境污染物：溴酸盐已被国际癌症研究机构（IARC）列为2B类致癌物之一；氨氮过量可能导致水体富营养化。氨氮的存在会抑制溴化物（Br⁻）向溴酸盐的转化。然而，在去除过程中氨氮与溴酸盐之间的相互作用尚不清楚。本研究旨在揭示紫外线照射或UV/TiO₂条件下氨氮与溴酸根离子之间的相互关系。在无紫外线照射时，即使溴酸盐和氨氮同时存在也都很稳定。在紫外线照射或UV/TiO₂条件下，溴酸盐和氨氮相互促进降解作用，呈现出协同降解机制。在中性环境中，溴酸盐和氨氮均可有效转化降解。此外，在反应开始时氨氮加速了溴酸盐向溴离子的转化，而溴酸盐的存在有利于氨氮向氮气的转化。
