UV-Based Advanced Oxidation Processes of Remazol Brilliant Blue R Dye Catalyzed by Carbon Dots

• Tipo: Artigo em Revista Científica Internacional
• Data: 2022-06-20

Autores

Luís Pinto da Silva (Autor) FCUP; Joaquim C G E Esteves da Silva (Autor) FCUP; Inês M. F. Cardoso (Autor) FCUP; Rita M.F. Fonseca Cardoso (Autor) FCUP

Revista

Título: Nanomaterials

Nº de Série 9 Vol. 12 Nº 1663

Páginas: 2116-2116

ISSN: 2079-4991

Editora: MDPI

Indexação

ISI Web of Knowledge - 5 Citações

Scopus - 6 Citações

Outras Informações

ID Authenticus: P-00W-RHD

DOI: 10.3390/nano12122116

Abstract (EN): UV-based advanced oxidation processes (AOPs) (UV/H2O2 and UV/S2O82-) with a titanium(IV)-doped carbon dot, TiP-CD, as a catalyst were developed for the decomposition of Remazol Brilliant Blue R (Reactive Blue 19), an anthraquinone textile dye (at T = 25 degrees C and pH = 7). The Ti-CD, with marked catalytic UV properties, was successfully synthesized by the one-pot hydrothermal procedure, using L-cysteine as carbon precursor, ethylenediamine as nitrogen source, PEG (polyethylene glycol) as a capping agent, and titanium(IV) isopropoxide (precursor of TiO2 doping). Contrary to azo dyes (methyl orange, orange II sodium salt, and reactive black 5), which achieved complete degradation in a time interval less than 30 min in the developed AOP systems (UV/H2O2, UV/S2O82-, and UV/TiO2), the RBB-R showed relatively low degradation rates and low discoloration rate constants. In the presence of the catalyzer, the reaction rate significantly increased, and the pseudo-first-order rate constants for the RBB-R discoloration were UV/3.0 mM H2O2/TIP-CD-0.0330 min(-1) and UV/1.02 mM S2O82-/TIP-CD-0.0345 min(-1).

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 15