Nitrogen-doped carbon nanotubes encapsulating Fe/Zn nanoparticles as a persulfate activator for sulfamethoxazole degradation: role of encapsulated bimetallic nanoparticles and nonradical reaction,Environmental Science: Nano

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Nitrogen-doped carbon nanotubes encapsulating Fe/Zn nanoparticles as a persulfate activator for sulfamethoxazole degradation: role of encapsulated bimetallic nanoparticles and nonradical reaction
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020-03-12 , DOI: 10.1039/d0en00050g
Shang Yanan _{1,

2,

3,

4,

5} , Xu Xing _{1,

2,

3,

4,

5} , Qinyan Yue _{1,

2,

3,

4,

5} , Baoyu Gao _{1,

2,

3,

4,

5} , Yanwei Li _{3,

4,

5,

6}

Affiliation

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.

中文翻译：

氮掺杂的碳纳米管，将Fe / Zn纳米颗粒包裹为磺胺甲恶唑降解的过硫酸盐活化剂：包裹的双金属纳米颗粒的作用和非自由基反应

在这项工作中，通过一锅热解策略合成了包封Zn和Fe双金属纳米颗粒（FeZn @ NC）的碳纳米管（CNT）。通过磺胺甲恶唑（SMX）的降解来确定FeZn @ NC不同比例的FeZn @ NC的过硫酸盐（PS）活化能力。结果表明，铁在形成外部碳纳米管中起关键作用，FeZn @ NC的催化活性主要基于包裹的FeZn纳米颗粒。另外，FeZn @ NC的异质结构大大增强了PS的活化。自由基猝灭实验和电子顺磁共振（EPR）光谱表明，单线态氧是SMX降解的关键活性氧。通过理论计算分析了吡啶-N，吡咯-N和石墨-N在外部CNT上的活性，

更新日期：2020-03-12

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