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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
Ni/S co-modified nanoscale Fe0 enables selective reaction pathways for complete dehalogenation
Feilong Gao1, Yucheng Shen1, Han Wu2
1Institute of Resources and Environmental Engineering, Shanxi University, Taiyuan 030006, China.
Journal of Hazardous Materials
|July 17, 2026
Summary
Surface-engineered nanomaterials enhance the degradation of stubborn organic pollutants. New Fe-NiₓSᵧ materials boost reductive dehalogenation, offering a sustainable solution for contaminated groundwater remediation.
Area of Science:
- Environmental Chemistry
- Materials Science
- Nanotechnology
Background:
- Nano-zero-valent iron (nFe⁰) materials are effective for dehalogenating halogenated organic contaminants (HOCs).
- Understanding the mechanistic roles of direct electron transfer (DET) and hydrogen atom transfer (HAT) is crucial, especially for sterically hindered compounds like tetrabromobisphenol A (TBBPA).
- Current remediation strategies for such contaminants lack robust performance and clear mechanistic insights.
Purpose of the Study:
- To develop surface-engineered nanomaterials that regulate DET and HAT pathways for efficient reductive dehalogenation.
- To investigate the mechanistic contributions of DET and HAT for sterically hindered HOCs.
- To provide a sustainable strategy for remediating HOCs in groundwater.
Main Methods:
- Fabrication of Fe-NiₓSᵧ nanomaterials with dual Ni/S active sites.
- Evaluation of reactivity and electron efficiency compared to pristine nFe⁰.
- Utilizing molecular dynamics simulations and density functional theory (DFT) calculations to elucidate reaction mechanisms.
Main Results:
- The optimal Fe-Ni₃S₇ nanomaterial exhibited over 109.9-fold higher reactivity and 359.7-fold greater electron efficiency than nFe⁰.
- DET pathway is significantly hindered by steric hindrance in TBBPA.
- HAT pathway offers a substantially lower energy barrier for TBBPA dehalogenation.
Conclusions:
- Surface engineering of Fe-NiₓSᵧ nanomaterials effectively regulates DET and HAT pathways.
- HAT is the dominant pathway for sterically hindered HOCs like TBBPA.
- This approach offers a promising and sustainable solution for remediating challenging HOCs in groundwater.
Keywords:
Molecular dynamics simulationsNanoscale zero-valent ironReductive dehalogenationSterically hindered contaminantsSurface engineeringMore Related Videos
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