A novel redox synergistic mechanism of peroxymonosulfate activation using Pd-Fe3O4 for ultra-fast chlorinated hydrocarbon degradation

被引：1
作者：
Deng, Jia [1 ,2 ]
Li, Fangzhou [1 ,2 ]
Qi, Zhen [1 ,2 ]
Huang, Wan [1 ,2 ]
Wan, Ziren [1 ,2 ]
Zhang, Lina [1 ,2 ]
Zheng, Di [1 ,2 ]
Li, Guanghe [1 ,2 ]
Zhang, Fang [1 ,2 ,3 ]
机构：
[1] Tsinghua Univ, Sch Environm, Beijing 100084, Peoples R China
[2] State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084, Peoples R China
[3] Natl Engn Lab Site Remediat Technol NEL SRT, Beijing 100015, Peoples R China
来源：
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY | 2024年 / 359卷
基金：
中国国家自然科学基金;
关键词：
Pd-Fe3O4; Peroxymonosulfate; Active species; Chlorinated hydrocarbons degradation; Redox synergistic mechanism; CHEMICAL OXIDATION; CARBON-TETRACHLORIDE; METAL NANOPARTICLES; TRICHLOROETHYLENE; WATER; EFFICIENCY; MN; CONTAMINANTS; 1,4-DIOXANE; REMEDIATION;
D O I：
10.1016/j.apcatb.2024.124499
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Peroxymonosulfate (PMS)-based heterogeneous advanced oxidation processes for chlorinated hydrocarbons (CHCs) removal in groundwater face the challenge of limited degradation ability. In this work, recyclable catalysts composed of Pd and Fe3O4 nanoparticles were synthesized to activate PMS and generate oxidative HO center dot and SO4 center dot- and reductive H center dot, simultaneously. The synergistic attack of different active species led to the ultra-fast degradation and mineralization of multiple CHCs. For trichloroethylene (TCE) degradation, the catalysts mass normalized reaction rate constant of Pd-Fe3O4/PMS system (30.85 L g(-1) min(-1)) was one order of magnitude higher than reported PMS activation systems. The d-band center of Pd in Pd-Fe3O4 was close to the Fermi level, indicating that Pd(0) sites of Pd-Fe3O4 was more conducive to the activation of PMS. In addition, PMS attached Fe3O4 sites caused internal electron transfer to Pd(0) for H center dot generation. Higher than 97 % of CHCs removal efficiency in continuous flow experiment demonstrated the application potential of Pd-Fe3O4/PMS system.
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页数：12
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