PREPARATION OF BIMETALLIC Ni-Fe NANOPARTICLES SUPPORTED ON MESOPOROUS ALUMINA FOR REDUCTIVE DECHLORINATION TOWARD TRICHLOROETHYLENE

WEI Jianjun; GE Yijie

doi:10.13205/j.hjgc.202306018

Volume 41 Issue 6

Jun. 2023

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WEI Jianjun, GE Yijie. PREPARATION OF BIMETALLIC Ni-Fe NANOPARTICLES SUPPORTED ON MESOPOROUS ALUMINA FOR REDUCTIVE DECHLORINATION TOWARD TRICHLOROETHYLENE[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(6): 132-142,173. doi: 10.13205/j.hjgc.202306018

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WEI Jianjun, GE Yijie. PREPARATION OF BIMETALLIC Ni-Fe NANOPARTICLES SUPPORTED ON MESOPOROUS ALUMINA FOR REDUCTIVE DECHLORINATION TOWARD TRICHLOROETHYLENE[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(6): 132-142,173. doi: 10.13205/j.hjgc.202306018

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PREPARATION OF BIMETALLIC Ni-Fe NANOPARTICLES SUPPORTED ON MESOPOROUS ALUMINA FOR REDUCTIVE DECHLORINATION TOWARD TRICHLOROETHYLENE

doi: 10.13205/j.hjgc.202306018

WEI Jianjun^{1
,
,},
GE Yijie²

1. School of Chemical Engineering, Beijing University of Chemical Technology, Beijing 102202, China;
2. Beijing SDL Technology Co., Ltd., Beijing 102206, China

Received Date: 2021-12-07
Available Online: 2023-09-02

Abstract

Abstract

Bimetallic nickel-iron nanoparticles were supported on mesoporous alumina in order to improve their dispersion performance, suspension ability and mobility in groundwater, as well as aqueous dechlorination reactivity and reactive longevity toward chlorinated organic contaminants in groundwater. Mesoporous alumina with a pore diameter of 7.65 nm, a pore volume of 0.68 cm³/g, and a specific surface area of 350 m²/g was prepared. Then bimetallic Ni-Fe (FeNi₃) nanoparticles were produced on mesoporous alumina by calcining in hydrogen gas (10% by volume) at 400℃. A nickel-iron layered double hydroxides was impregnated onto the carrier. Bare Ni-Fe nanoparticles were 50~100 nm in diameter and agglomerated together. In comparison, the crystallite size of the supported Ni-Fe nanoparticles decreased to 11.5 nm due to the interfacial interaction between the nanoparticles and the mesoporous alumina, and the confinement effect of the mesoporous structure. In addition, the dispersion performance of the supported Ni-Fe nanoparticles was dramatically enhanced. The composite of Ni-Fe nanoparticles and mesoporous alumina, i.e., Ni-Fe-nanoparticles/mesoporous-alumina, remained suspending in water within 12 h, whereas bare Ni-Fe nanoparticles precipitated in merely 2 min. When trichloroethylene was loaded at an initial concentration of 23.7 mg/L, i.e., 1000 times the average concentration in groundwater, the overall yield of two-carbon hydrocarbons was 12.03% in 48 h by the supported Ni-Fe nanoparticles, which was approximately 9 times greater than the bare counterpart. Furthermore, Ni-Fe-nanoparticles/mesoporous-alumina showed excellent adsorption activity, and only 0.41% of trichloroethylene remained in 48 h. The composite showed a remarkable reactive longevity in multi-run use, with the yield of two-carbon hydrocarbons during the 4th run being the same as the 1st run (0.23 μmol). Furthermore, it still exhibited adsorption and dechlorination activity until the 8th run, during which the degradation of trichloroethylene and yield of two-carbon hydrocarbons were 1.05 μmol and 0.043 μmol, respectively. The results indicate that the composite is a promising material for remediation of groundwater contaminated by chlorinated organic compounds.
- mesoporous alumina,
- nanoparticles,
- nickel-iron,
- bimetal,
- layered double hydroxides,
- trichloroethylene,
- dechlorination,
- groundwater

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References(36)

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