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Catalytic performance of heteroatom-modified carbon nanotubes in advanced oxidation processes

Restivo, João ; Rocha, Raquel P. ; Silva, Adrián M.T. ; Órfão, José J.M. ; Pereira, Manuel F.R. ; Figueiredo, José L.

Chinese journal of catalysis, 2014-06, Vol.35 (6), p.896-905 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    Catalytic performance of heteroatom-modified carbon nanotubes in advanced oxidation processes
  • Autor: Restivo, João ; Rocha, Raquel P. ; Silva, Adrián M.T. ; Órfão, José J.M. ; Pereira, Manuel F.R. ; Figueiredo, José L.
  • Assuntos: Advanced oxidation processes ; Carbon nanotubes ; Catalytic ozonation ; Catalytic wet air oxidation ; Nitrogen groups ; Oxygen groups ; Sulfur groups ; Surface chemistry ; 修饰 ; 催化性能 ; 催化湿式氧化 ; 含氮基团 ; 多壁碳纳米管 ; 杂原子 ; 模型化合物 ; 高级氧化技术
  • É parte de: Chinese journal of catalysis, 2014-06, Vol.35 (6), p.896-905
  • Notas: Advanced oxidation processes ;Catalytic ozonation ;Catalytic wet air oxidation ;Sulfur groups ;Nitrogen groups;Oxygen groups; Carbon nanotubes ;Surface chemistry
    Multi-walled carbon nanotubes （CNTs） were submitted to chemical and thermal treatments in order to incorporate different heteroatoms on the surface.O-, S- and N-containing groups were successfully introduced onto the CNTs without significant changes of the textural properties. The catalytic activity of these heteroatom-modified CNTs was studied in two liquid phase oxidation processes： catalytic ozonation and catalytic wet air oxidation （CWAO）, using oxalic acid and phenol as model compounds. In both cases, the presence of strongly acidic O-containing groups was found to decrease the catalytic activity of the CNTs. On the other hand, the introduction of S species （mainly sulfonic acids） enhanced the removal rate of the model compounds, particularly in the CWAO of phenol. Additional experiments were performed with a radical scavenger and sodium persulfate, in order to clarify the reaction mechanism. Nitrogen functionalities improve the catalytic performance of the original CNTs, regardless of the process or of the pollutant.
    21-1195/O6
  • Descrição: Multi-walled carbon nanotubes （CNTs） were submitted to chemical and thermal treatments in order to incorporate different heteroatoms on the surface.O-, S- and N-containing groups were successfully introduced onto the CNTs without significant changes of the textural properties. The catalytic activity of these heteroatom-modified CNTs was studied in two liquid phase oxidation processes： catalytic ozonation and catalytic wet air oxidation （CWAO）, using oxalic acid and phenol as model compounds. In both cases, the presence of strongly acidic O-containing groups was found to decrease the catalytic activity of the CNTs. On the other hand, the introduction of S species （mainly sulfonic acids） enhanced the removal rate of the model compounds, particularly in the CWAO of phenol. Additional experiments were performed with a radical scavenger and sodium persulfate, in order to clarify the reaction mechanism. Nitrogen functionalities improve the catalytic performance of the original CNTs, regardless of the process or of the pollutant.
  • Editor: Elsevier B.V
  • Idioma: Chinês;Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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