Development of Bismuth Oxyhalides for Organic Pollutant Photodegradation and Water Oxidation: Effect of Synthesis Parameter and Halide Species

Autor(es)

Gabriel K. Macedo ^[1] ; Eduardo Henrique Dias ; Caue Ribeiro ^[3] ; Osmando F. Lopes ^[4]

Afiliação do(s) autor(es)

^[1] Universidade de São Paulo. Instituto de Química de São Carlos - Brasil

^[3] Embrapa Instrumentação - Brasil

^[4] Universidade Federal de Uberlândia (IQUFU). Instituto de Química. Laboratório de Fotoquímica e Ciência dos Materiais (LAFOT-CM) - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 33, n. 8, p. 948-957, 2022-06-15.

Resumo

The development of visible-light active photocatalysts is vital to harvest the solar irradiation and build efficient photoelectrochemical devices. Bismuth oxyhalide (BiOCl, BiOBr and BiOI) materials stand out due to their remarkable properties, e.g., the band gap energy can be tuned from 1.9 to 3.4 eV depends on the halide employed. However, the hydrothermal synthesis of this material class was not properly investigated and compared. Then, we evaluated the effect of the hydrothermal treatment in the BiOX’s structural, electronic, morphological and textural properties and the relationship with their photocatalytic performance. Methylene blue (MB) dye was used as probe for photocatalytic performance evaluation under ultraviolet (UV) and visible (Vis) radiation. BiOCl and BiOBr samples showed a good photoactivity under both UV and visible radiation, on other hand the BiOI samples was not active, likely due to the fast charge recombination. BiOCl and BiOBr samples exhibit a favorably interaction with MB dye, because their surfaces are negatively charged. BiOCl samples were able to promote around 40 and 80% of the MB dye degradation under visible and UV radiation, respectively. The samples were also employed as photoanode for O2 evolution, BiOI sample exhibited the best performance, due to the synergistic effect of photocatalysis and electrocatalysis. (AU)

• Processo FAPESP: 18/01258-5 - Novos processos catalíticos e fotocatalíticos para a conversão direta de metano e CO2 em produtos
• Beneficiário: José Maria Correa Bueno
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 19/10689-2 - Preparação de sistemas de reação para a oxidação seletiva fotocatalítica do metano para metanol
• Beneficiário: Eduardo Henrique Dias
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto