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| Mechanism of naphthalene adsorption-oxidation within the iron-carbon composites activated hydrogen peroxide systems |
| Received:March 17, 2022 Revised:April 11, 2022 |
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| KeyWord:iron sources;naphthalene;iron-carbon composites;adsorption;oxidation |
| Author Name | Affiliation | E-mail | | DONG Xinzhu | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | QIAN Linbo | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | lbqian@issas.ac.cn | | LONG Ying | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
College of Environment and Resources, Southwest University of Science and Technology, Mianyang 621002, China | | | WEI Zifei | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
College of Environment and Resources, Southwest University of Science and Technology, Mianyang 621002, China | | | ZHANG Wenying | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | LIANG Cong | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | CHEN Mengfang | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | mfchen@issas.ac.cn |
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| Abstract: |
| To evaluate the influence of different iron sources on the structure of iron-carbon composites and adsorption-oxidation of naphthalene in groundwater, ferrous sulfate, ferric chloride, ferric nitrate, nano-zero-valent iron, and nano-magnetite were used as iron sources, and glucose was used as the carbon source to synthesize iron-carbon composites using hydrothermal and carbothermal methods. The specific surface areas and pore structures, surface functional groups, crystal structures, and redox capacities of the composites were determined using the Brunauer-Emmett-Teller test, infrared spectroscopy, X-ray diffraction, and electrochemical workstation, respectively. In addition, the effects of the adsorption and activation of hydrogen peroxide on the removal of naphthalene by different composites were studied via kinetic experiments. The results showed that the adsorption capacities of Fe2SO4@C, FeCl3@C, and Fe(NO3) 3@C composites to naphthalene were weak because of their smaller pore volumes or richer surface oxygen functional groups, which could not activate the oxidation of naphthalene. Large pore volumes and active substances of structural ferrous iron[Fe(Ⅱ)] and carbonized trioxide(Fe3C) were generated in the nFe0@C andnFe3O4@C composites, respectively, which could effectively remove naphthalene via adsorption and oxidation of activated hydrogen peroxide. The best naphthalene removal was achieved usingnFe3O4@C, with a removal efficiency of 63.7%. These results indicate that the iron-carbon composites prepared from solid iron sources possess low polarities, large pore volumes, wellcrystallized iron active substances, and great application potential in the remediation of naphthalene-contaminated water. |
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