CNTs/ferrihydrite as a highly efficient heterogeneous Fenton catalyst for the degradation of bisphenol A: The important role of CNTs in accelerating Fe (III)/Fe(II) cycling

被引:217
作者
Zhu, Runliang [1 ]
Zhu, Yanping [1 ,2 ,3 ]
Xian, Haiyang [1 ,2 ]
Yan, Lixia [1 ,2 ]
Fu, Haoyang [1 ,2 ]
Zhu, Gangqiang [4 ]
Xi, Yunfei [3 ]
Zhu, Jianxi [1 ]
He, Hongping [1 ]
机构
[1] Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Queensland Univ Technol, Sch Earth Environm & Biol Sci, Brisbane, Qld 4001, Australia
[4] Shaanxi Normal Univ, Sch Phys & Informat Technol, Xian 710062, Peoples R China
基金
中国国家自然科学基金;
关键词
Ferrihydrite; CNTs; Heterogeneous Fenton catalysis; Fe(III)/Fe(II) redox cycling; H2O2; decomposition; WALLED CARBON NANOTUBES; CORE-SHELL NANOWIRES; ADVANCED OXIDATION PROCESSES; PERSISTENT FREE-RADICALS; HYDROGEN-PEROXIDE; ACTIVATED CARBON; GRAPHENE OXIDE; FERRIHYDRITE; ADSORPTION; REMOVAL;
D O I
10.1016/j.apcatb.2020.118891
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
The generation of Fe(II) from Fe(III) is the rate-limiting step in the heterogeneous Fenton reaction, and accelerating this step is critical for enhancing the reaction efficiency and also the subject of extensive studies. In this work, the oxidized multi-walled carbon nanotubes (CNTs) were coupled with ferrihydrite (Fh) to synthesize novel and highly efficient heterogeneous Fenton catalysts (CNTs/Fh). Interestingly, the calculated apparent rate constants by 3%CNTs/Fh could reach similar to 7.1 times as high as that by Fh, well in agreement with the accelerated decomposition rate of H2O2, as well as the enhanced generation rate of Fe(II) and hydroxyl radicals in the CNTs/Fh system. The density functional theory calculations and the cyclic voltammograms curves both well indicated that the Fe(III)/Fe(II) redox cycling on CNTs/Fh could be significantly enhanced during the Fenton reaction, from both dynamic (accelerating the electron transfer from H2O2 to Fh) and thermodynamic (lowering Fe(III)/Fe (II) redox potential) aspects.
引用
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页数:10
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