Degradation mechanism of ammonia nitrogen synergistic with bromate under UV or UV/TiO 2

• Published in: Environmental science and pollution research international Vol. 30; no. 9; p. 22284
• Main Authors: Zeng, Yiting, Zeng, Jin, Luo, Zhenwei, Pan, Jiahao, Luo, Yuxia, Liu, Jun, Wang, Chunying
• Format: Journal Article
• Language: English
• Published: Germany 01.02.2023
• Subjects: Ammonia; Bromates; Nitrogen; Water Pollutants, Chemical - analysis; Water Purification; Photolysis; Ammonia nitrogen; Bromate; Photocatalysis; TiO2

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 .