Heterogeneous Fenton-like surface properties of oxygenated graphitic carbon nitride

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:587

Article

Oliveira, Wanessa L.¹  Ferreira, Meiriele Antunes²  Mourao, Henrique A. J. L.²  Pires, Manoel J. M.²  Ferreira, Vinicius³  Gorgulho, Honoria F.³  Cipriano, Daniel F.⁴  Freitas, Jair C. C.⁴  Mastelaro, Valmor R.⁵  Nascimento, Otaciro R.⁵  Ferreira, Dalva E. C.¹  Fioravante, Frederico Ramos¹  Pereira, Marcio C.⁶  de Mesquita, Joao P.¹ 

[1] Univ Fed Vales Jequitinhonha & Mucuri, Dept Quim, Rodovia MGT 367 Km 583,5000, BR-39100000 Diamantina, MG, Brazil

[2] Univ Fed Vales Jequitinhonha & Mucuri, Inst Ciencia & Tecnol, Rodovia MGT 367 Km 583,5000, BR-39100000 Diamantina, MG, Brazil

[3] Univ Fed Sao Joao del Rei, Dept Ciencias Nat, Praca Dom Helvecio 74, BR-36301160 Sao Joao Del Rei, MG, Brazil

[4] Univ Fed Espirito Santo, Lab Carbon & Ceram Mat, Dept Phys, Ave Fernando Ferrari,514 Goiabeiras, BR-29075910 Vitoria, ES, Brazil

[5] Univ Sao Paulo, Inst Fis Sao Carlos, Ave Trabalhador Sao Carlense, BR-13566590 Sao Carlos, SP, Brazil

[6] Univ Fed Vales Jequitinhonha & Mucuri, Inst Ciencia Engn & Tecnol, BR-39803371 Teofilo Otoni, MG, Brazil

关键词: Graphitic carbon nitride;    Oxygenated functional groups;    Fenton-like reaction;   

DOI  :  10.1016/j.jcis.2020.12.031

来源: Elsevier

【 摘 要 】

The photo-Fenton activity of graphitic carbon nitride (g-C3N4) has been widely studied, nevertheless, its Fenton-like catalytic behavior in the dark has not yet been demonstrated. In the present work, it is shown that oxygenated g-C3N4 obtained at different temperatures (500-600 degrees C) can degrade indigo carmine with hydrogen peroxide in the dark by a reaction similar to a conventional Fenton's reaction. Based on an extensive characterization of g-C3N4, we conclude that Fenton-like activity is directly related to the oxygenated functional groups on g-C3N4 structure, mainly by -OH functional groups. Oxygenated functional groups (e.g., hydroquinone-like groups) can reduce the H2O2 and generate oxidizing hydroxyl radicals, just like in the Fenton reaction performed by metals. In addition to new information on g-C3N4 surface reactivity revealed by this study, the metal-free oxygenated g-C3N4 catalyst may be an alternative to traditional metal catalysts used in Fenton-like reactions for advanced oxidation. (c) 2020 Elsevier Inc. All rights reserved.

【 授权许可】

Free