Nitrogen-doped carbon nanotubes encapsulating Fe/Zn nanoparticles as a persulfate activator for sulfamethoxazole degradation: role of encapsulated bimetallic nanoparticles and nonradical reaction. Issue 5 (31st March 2020)

• Record Type: Journal Article
• Authors: Yanan, Shang; Xing, Xu; Yue, Qinyan; Gao, Baoyu; Li, Yanwei
• Is Part Of: Environmental science. Volume 7:Issue 5(2020)
• Page Start: 1444
• Page End: 1453
• Publication Date: 2020-03-31
• Subjects: Environmental sciences -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d0en00050g
• Languages: English
• ISSNs: 2051-8153

Abstract

Abstract : In this work, the carbon nanotubes (CNTs) encapsulating Zn and Fe bimetallic nanoparticles (FeZn@NC) were synthesized through a one-pot pyrolytic strategy. Abstract : In this work, the carbon nanotubes (CNTs) encapsulating Zn and Fe bimetallic nanoparticles (FeZn@NC) were synthesized through a one-pot pyrolytic strategy. The persulfate (PS) activation ability of FeZn@NC with various ratios of Fe and Zn was determined by sulfamethoxazole (SMX) degradation. The results indicated that the iron played a key role in forming external CNTs and the catalytic activity of FeZn@NC was mainly based on the encapsulated FeZn nanoparticles. In addition, PS activation was greatly strengthened by the heterostructure of FeZn@NC. Free radical quenching experiments and electron paramagnetic resonance (EPR) spectra suggested that the singlet oxygen was the key reactive oxygen species for SMX degradation. The activity of pyridinic-N, pyrrolic-N and graphitic-N on external CNTs was analyzed by theoretical calculations, which showed the pyridinic-N possessed strong adsorptive ability to activate PS to degenerate sulfate radicals.