Kinetics and Mechanism of Carbon Tetrachloride Rapid Reduction by Nanoscale Ni-Fe Using Scanning Electron Microscope
The nanoscale iron particles have high specific surface area and high reactivity, can be used to rapidly reduce chlorinated alkene to the non-toxic chloride ions, chlorine-free end products ethene and ethane. But nanoscale iron particle degrades chlorinated alkanes with much toxic intermediate or en...
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| Format: | Article |
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Science Press, PR China
2015-05-01
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| Series: | Yankuang ceshi |
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| Online Access: | http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.2015.03.015 |
| _version_ | 1811168514604531712 |
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| author | HUANG Yuan-ying WANG Qian HAN Zi-jin LIU Fei |
| author_facet | HUANG Yuan-ying WANG Qian HAN Zi-jin LIU Fei |
| author_sort | HUANG Yuan-ying |
| collection | DOAJ |
| description | The nanoscale iron particles have high specific surface area and high reactivity, can be used to rapidly reduce chlorinated alkene to the non-toxic chloride ions, chlorine-free end products ethene and ethane. But nanoscale iron particle degrades chlorinated alkanes with much toxic intermediate or end products. A small amount of a second metal deposited on the iron surface has proved to enhance the reactivity of metal particles. In this paper, laboratory-synthesized nanoscale Ni-Fe (2% by weight) particles have diameters on the order of 20-60 nm using Scanning Electron Microscope. In batch experiments, the kinetics, products, stability of performance, and mechanism of carbon tetrachloride (CT) by Ni-Fe nanoparticles were investigated. CH4 (~42%) and CH2Cl2 (~17%) in nanoscale Ni-Fe system were the major end products. Compared to nanoscale iron and the cast iron scarp, a major benefit of the nanoscale Ni-Fe particles for treatment of CT is the low yield of chlorinated by-product. Due to the presence of catalyst (Ni) on the surface, dechlorination rate was significantly increased and production of chlorinated byproducts was notably reduced. Catalytic metal Ni from the nanoscale Ni-Fe particles would not dissolve into water so that it would not form a secondary contamination of water body. The laboratory-synthesized nanoscale particles are quite stable under ambient conditions. For nano-scale Ni-Fe particles system, the end-product CH4 were reduced by 13% compared with nanoscale Pd-Fe particles. Although tnano-scale Pd-Fe particles are effective in dechlorination of chlorinated organic compounds, nano-scale Ni-Fe particles are more economically viable which made it possible for the large scale remediation of water and soil contaminated by chlorinated organic compounds. |
| first_indexed | 2024-04-10T16:27:28Z |
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| language | English |
| last_indexed | 2024-04-10T16:27:28Z |
| publishDate | 2015-05-01 |
| publisher | Science Press, PR China |
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| series | Yankuang ceshi |
| spelling | doaj.art-f62c7afc5d7e49b99a59f82ae2de87942023-02-09T01:42:38ZengScience Press, PR ChinaYankuang ceshi0254-53572015-05-0134334635210.15898/j.cnki.11-2131/td.2015.03.015ykcs-34-3-346Kinetics and Mechanism of Carbon Tetrachloride Rapid Reduction by Nanoscale Ni-Fe Using Scanning Electron MicroscopeHUANG Yuan-ying0WANG Qian1HAN Zi-jin2LIU Fei3National Research Center for Geoanalysis, Beijing 100037, ChinaSchool of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, ChinaSchool of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, ChinaSchool of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, ChinaThe nanoscale iron particles have high specific surface area and high reactivity, can be used to rapidly reduce chlorinated alkene to the non-toxic chloride ions, chlorine-free end products ethene and ethane. But nanoscale iron particle degrades chlorinated alkanes with much toxic intermediate or end products. A small amount of a second metal deposited on the iron surface has proved to enhance the reactivity of metal particles. In this paper, laboratory-synthesized nanoscale Ni-Fe (2% by weight) particles have diameters on the order of 20-60 nm using Scanning Electron Microscope. In batch experiments, the kinetics, products, stability of performance, and mechanism of carbon tetrachloride (CT) by Ni-Fe nanoparticles were investigated. CH4 (~42%) and CH2Cl2 (~17%) in nanoscale Ni-Fe system were the major end products. Compared to nanoscale iron and the cast iron scarp, a major benefit of the nanoscale Ni-Fe particles for treatment of CT is the low yield of chlorinated by-product. Due to the presence of catalyst (Ni) on the surface, dechlorination rate was significantly increased and production of chlorinated byproducts was notably reduced. Catalytic metal Ni from the nanoscale Ni-Fe particles would not dissolve into water so that it would not form a secondary contamination of water body. The laboratory-synthesized nanoscale particles are quite stable under ambient conditions. For nano-scale Ni-Fe particles system, the end-product CH4 were reduced by 13% compared with nanoscale Pd-Fe particles. Although tnano-scale Pd-Fe particles are effective in dechlorination of chlorinated organic compounds, nano-scale Ni-Fe particles are more economically viable which made it possible for the large scale remediation of water and soil contaminated by chlorinated organic compounds.http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.2015.03.015scanning electron microscopenanoscale ni-fecarbon tetrachloridedechlorination mechanism |
| spellingShingle | HUANG Yuan-ying WANG Qian HAN Zi-jin LIU Fei Kinetics and Mechanism of Carbon Tetrachloride Rapid Reduction by Nanoscale Ni-Fe Using Scanning Electron Microscope Yankuang ceshi scanning electron microscope nanoscale ni-fe carbon tetrachloride dechlorination mechanism |
| title | Kinetics and Mechanism of Carbon Tetrachloride Rapid Reduction by Nanoscale Ni-Fe Using Scanning Electron Microscope |
| title_full | Kinetics and Mechanism of Carbon Tetrachloride Rapid Reduction by Nanoscale Ni-Fe Using Scanning Electron Microscope |
| title_fullStr | Kinetics and Mechanism of Carbon Tetrachloride Rapid Reduction by Nanoscale Ni-Fe Using Scanning Electron Microscope |
| title_full_unstemmed | Kinetics and Mechanism of Carbon Tetrachloride Rapid Reduction by Nanoscale Ni-Fe Using Scanning Electron Microscope |
| title_short | Kinetics and Mechanism of Carbon Tetrachloride Rapid Reduction by Nanoscale Ni-Fe Using Scanning Electron Microscope |
| title_sort | kinetics and mechanism of carbon tetrachloride rapid reduction by nanoscale ni fe using scanning electron microscope |
| topic | scanning electron microscope nanoscale ni-fe carbon tetrachloride dechlorination mechanism |
| url | http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.2015.03.015 |
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