| Texto completo | |
| Autor(es): |
Reis, Roberta Y. N.
;
Rodriguez-Gomez, Alberto
;
Mascaro, Lucia H.
;
Rodrigo, Manuel A.
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING; v. 13, n. 5, p. 12-pg., 2025-10-01. |
| Resumo | |
The chloralkaline industry is recognized for its technological maturity and high energy efficiency; however, recent advances seek to further optimize the process by integrating complementary technologies. In this work, a photoelectrochemical approach is explored as an alternative to conventional electrolysis to evaluate the impact of light irradiation on the generation of oxidized chlorine species (OCS) and hydrogen (H-2). A flow photoelectrolyzer equipped with a WO3 anode, stainless steel cathode, and proton exchange membrane was designed, fabricated, and tested under different high-power LED irradiation conditions. The influence of current density and irradiation power on the formation of the products and the faradaic and energy efficiencies was systematically evaluated. Under optimal conditions (1.33 mA cm(-2), 10 W LED), the photoelectrolyzer achieved faradaic efficiencies of 38 % for OCS and 71.8 % for H-2, with a notable reduction in cell voltage compared to the electrolyzer. Although the energy efficiency associated with simulated irradiation represents a challenge, the results indicate that in the presence of irradiation, higher rates and faradaic efficiencies are obtained for OCS and H-2. Furthermore, mechanistic studies revealed that both h(+) and (OH)-O-center dot radicals are essential for OCS formation. These findings reinforce the potential of photoelectrocatalysis as a viable route for sustainable chlor-alkali process enhancement and provide valuable insights into the coupling of photonic and electrochemical processes. (AU) | |
| Processo FAPESP: | 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais |
| Beneficiário: | Elson Longo da Silva |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |
| Processo FAPESP: | 17/11986-5 - Geração e Armazenamento de Novas Energias: trazendo desenvolvimento tecnológico para o país |
| Beneficiário: | Ana Flávia Nogueira |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Centros de Pesquisa Aplicada |
| Processo FAPESP: | 23/03168-1 - Desenvolvimento e estudo de reator fotoeletrocatalítico aplicado para a degradação de compostos farmacêuticos |
| Beneficiário: | Roberta Yonara Nascimento Reis |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado |
| Processo FAPESP: | 21/11326-0 - Estudo de fotoeletrodos de cobre e óxido de cobre para tratamentos de águas residuais após a pandemia do COVID-19 |
| Beneficiário: | Roberta Yonara Nascimento Reis |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |