Efficient photochemical denitrification by UV/sulfite system: Mechanism and applications
文献类型：期刊论文
| 作者 | Tan, Ling; Mao, Ran; Su, Peidong; Gu, Jia; Chen, Huan; Jiang, Fang; Zhao, Xu |
| 刊名 | JOURNAL OF HAZARDOUS MATERIALS
 |
| 出版日期 | 2021-09-15 |
| 卷号 | 418页码:- |
| 关键词 | Denitrification Hydrated electron Nitrate UV/sulfite Wastewater |
| ISSN号 | 0304-3894 |
| 英文摘要 | Denitrification is an effective strategy to control eutrophication caused by excessive nitrate in water. However, the comparatively low efficiency of nitrate removal and N-2 selectivity remains a challenge in the denitrification process. Herein, this study proposed a novel photochemical denitrification process by introducing hydrated electron (e(aq)(-)) to reduce nitrate in UV/sulfite system. The results indicated that the optimized UV/sulfite system could effectively reduce nitrate to N-2 with a nearly 100% denitrification efficiency in 90 min. e(aq)(-) was identified as the mainly reactive species to achieve rapid removal of nitrate and nitrite, and the result was verified by quenching and laser flash photolysis tests. Benefiting from the high dispersion of e(aq)(-), in water and the rapid reaction rate between e(aq)(-) and the target, the generated N2O is susceptible to be reduced, leading to a high selectivity of N-2 that was confirmed by N-15-isotopic. Besides, thermodynamic results based on the density functional theory (DFT) calculations suggested that the photochemical denitrification process was exothermic process and tend to transform to N-2. Significantly, UV/sulfite system applied in the nickel-plating wastewater showed high denitrification efficiency, demonstrating that the novel photochemical denitrification process is promising for practical wastewater treatment. |
| WOS研究方向 | Engineering, Environmental ; Environmental Sciences |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/46200]  |
| 专题 | 生态环境研究中心_中国科学院饮用水科学与技术重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China 2.Nanjing Univ Sci & Technol, Sch Environm & Biol Engn, Key Lab Jiangsu Prov Chem Pollut Control & Resour, Nanjing 210094, Peoples R China 3.Shenzhen Univ, Coll Chem & Environm Engn, Shenzhen 518071, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tan, Ling,Mao, Ran,Su, Peidong,et al. Efficient photochemical denitrification by UV/sulfite system: Mechanism and applications[J]. JOURNAL OF HAZARDOUS MATERIALS,2021,418:-. |
| APA | Tan, Ling.,Mao, Ran.,Su, Peidong.,Gu, Jia.,Chen, Huan.,...&Zhao, Xu.(2021).Efficient photochemical denitrification by UV/sulfite system: Mechanism and applications.JOURNAL OF HAZARDOUS MATERIALS,418,-. |
| MLA | Tan, Ling,et al."Efficient photochemical denitrification by UV/sulfite system: Mechanism and applications".JOURNAL OF HAZARDOUS MATERIALS 418(2021):-. |
入库方式： OAI收割
来源：生态环境研究中心
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