KMS of Research Center for Eco-Environmental Sciences， CAS
| Trace Iron as single-electron shuttle for interdependent activation of peroxydisulfate and HSO3-/O(2 )enables accelerated generation of radicals | |
Zeng, Huabin; Cheng, Yue; Xing, Xueci; Zhang, Tao ; Zhao, Xu
| |
| 2022-09-01 | |
| Source Publication | WATER RESEARCH
 |
| ISSN | 0043-1354 |
| Volume | 223Issue:0Pages:118935 |
| Abstract | The generation of reactive oxygen species generally requires initiators in various environmental remediation processes, which necessitates high dosage of activators and downstream treatment for eliminating the accumulation of deactivated catalysts. Herein, a coupled process was constructed using trace iron for simultaneously activating HSO3- /O-2 system and peroxydisulfate (PDS) oxidation system, where the iron ions (2 mg/L) trans-ferred single-electron from the former system to the latter due to the moderate redox potential (Fe3+/Fe2+ , +0.77 V) between the potentials of SO3.- /HSO3- (+0.63V) and PDS/SO4.-(+2.01 V). Hence, the phenol degradation quickly occurred at a first-order kinetic constant of k(1)=0.223 min(-1) due to the accelerated generation of sulfate radical (SO4.-) and hydroxyl radical ((OH)-O-.) in the process. The k(1) value was almost 6-fold of that in the deoxy-genated condition (0.040 min(-1)). Density function theory reveals that the single electron shuttle spatially separates the electron-donating activation of HSO3- and electron-accepting activation of PDS, while avoiding the mutual-annihilation of HSO(3)(- )and S(2)O(8)(2-)via direct two-electron transfer. Finally, utilizing the in-situ generated electron-shuttle (dissolved iron from cast iron pipe), the HSO3-/PDS reagent could efficiently inactivate the chlorine-resistant pathogens and inhibits biofilm regrowth inside the distribution systems at regular intervals or infectious disease outbreak in a neighborhood. |
| Department | 中国科学院饮用水科学与技术重点实验室 ; 中国科学院饮用水科学与技术重点实验室 |
| Keyword | VISIBLE-LIGHT Z-SCHEME INORGANIC RADICALS HYDROXYL RADICALS SULFUR-DIOXIDE RATE CONSTANTS OXIDATION WATER PERSULFATE SULFITE |
| Document Type | 期刊论文 |
| Identifier | https://ir.rcees.ac.cn/handle/311016/47912 |
| Collection | 中国科学院饮用水科学与技术重点实验室 |
| Corresponding Author | Xing, Xueci |
| Affiliation | 1.Xiamen Univ, Coll Environm & Ecol, Xiamen 361102, Peoples R China 2.Lappeenranta Lahti Univ Technol LUT, Sch Engn Sci, Dept Separat Sci, FI-50130 Lappeenranta, Finland 3.Guangzhou Univ, Inst Environm Res Greater Bay, Key Lab Water Qual & Conservat Pearl River Delta, Minist Educ, Guangzhou 510006, Peoples R China 4.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China |
| Recommended Citation GB/T 7714 | Zeng, Huabin,Cheng, Yue,Xing, Xueci,et al. Trace Iron as single-electron shuttle for interdependent activation of peroxydisulfate and HSO3-/O(2 )enables accelerated generation of radicals[J]. WATER RESEARCH,2022,223(0):118935. |
| APA | Zeng, Huabin,Cheng, Yue,Xing, Xueci,Zhang, Tao,&Zhao, Xu.(2022).Trace Iron as single-electron shuttle for interdependent activation of peroxydisulfate and HSO3-/O(2 )enables accelerated generation of radicals.WATER RESEARCH,223(0),118935. |
| MLA | Zeng, Huabin,et al."Trace Iron as single-electron shuttle for interdependent activation of peroxydisulfate and HSO3-/O(2 )enables accelerated generation of radicals".WATER RESEARCH 223.0(2022):118935. |
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| Trace Iron as single（3787KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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