Key factors in the ligand effects on the photo redox cycling of aqueous iron species
文献类型：期刊论文
| 作者 | Wu, Bingdang; Zhang, Guoyang; Zhang, Li; Song, Xiaojie; Zhang, Shujuan; Zhu, Ben-Zhan |
| 刊名 | GEOCHIMICA ET COSMOCHIMICA ACTA
 |
| 出版日期 | 2020-07-15 |
| 卷号 | 281页码:1-11 |
| ISSN号 | 0016-7037 |
| 关键词 | Fe(II) Fe(III) Diketone Dissolved oxygen Photochemistry |
| 英文摘要 | Photochemical transformation of iron plays crucial roles in the geochemical evolution of marine, terrestrial and atmospheric systems. In the present work, the photo-conversion of ferric iron and ferrous iron were studied in the presence of four naturally abundant organic compounds (OCs): two carboxylic acids [oxalic acid, salicylic acid] and two diketones [acetylacetone (Hacac), diacetyl]. The key finding is that the two diketones significantly accelerated both the photo-reduction of Fe(III) and the photo-oxidation of Fe(II) in acidic solutions. The quantum yields (Phi) of [Fe(acac)](2+) and Fe(III)-salicylate at 254 nm were estimated to be 0.23 and 0.02, respectively. The formation of photoactive Fe(III)-OC complexes accounted for the changed photo-steady state of iron but was not the exclusive factor. The enhanced consumption of dissolved oxygen (6 and 16 times in Fe(III) and Fe(II)-initiated systems) was attributed to the effects of the nonchelating diacetyl on the photo redox cycling of iron. Although the photoactivity of Fe(III)-oxalate (Phi(254 nm) = 1.25) was much higher than those of Fe(III)-acac and Fe(III)-salicylate, the effect of oxalate did not last, because oxalate was rapidly depleted in several minutes. The addition of the two diketones kept either the Fe(III)-initiated system or the Fe(II)-initiated system at the Fe(II) state for hours, which is of great environmental significance, because Fe(II) is more active in both engineered and natural environments. (C) 2020 Elsevier Ltd. All rights reserved. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/44719]  |
| 专题 | 生态环境研究中心_环境化学与生态毒理学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Wu, Bingdang,Zhang, Guoyang,Zhang, Li,et al. Key factors in the ligand effects on the photo redox cycling of aqueous iron species[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2020,281:1-11. |
| APA | Wu, Bingdang,Zhang, Guoyang,Zhang, Li,Song, Xiaojie,Zhang, Shujuan,&Zhu, Ben-Zhan.(2020).Key factors in the ligand effects on the photo redox cycling of aqueous iron species.GEOCHIMICA ET COSMOCHIMICA ACTA,281,1-11. |
| MLA | Wu, Bingdang,et al."Key factors in the ligand effects on the photo redox cycling of aqueous iron species".GEOCHIMICA ET COSMOCHIMICA ACTA 281(2020):1-11. |
入库方式： OAI收割
来源：生态环境研究中心
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