Surface facet Fe2O3-based visible light photocatalytic activation of persulfate for the removal of RR120 dye: nonlinear modeling and optimization

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Khan, Saad U. ; Khan, Hammad ; Hussain, Sajjad ; Torquato, Lilian D. M. ; Khan, Sabir ; Miranda, Raul G. ; Oliveira, Danielle P. ; Dorta, Daniel J. ; Lima Perini, Joao A. ; Choi, Hyeok ; Boldrin Zanoni, Maria, V

• Tipo de documento: Artigo Científico
• Fonte: Environmental Science and Pollution Research; v. N/A, p. 14-pg., 2022-03-05.

Resumo

Photocatalytic activation of persulfate (PS) is recently emerged as an energy-efficient and environmentally sustainable approach for pollutants degradation, which enables to leverage the strengths of low-cost solar energy and heterogeneous catalysis. Herein, we investigated the photocatalytic decomposition of reactive red 120 (RR120) dye using PS-activated Fe2O3 nanoparticles and elucidated the effect of their facets, alpha-Fe2O3 (001), beta-Fe2O3 (100), and gamma-Fe2O3 (111). beta-Fe2O3 not only boosted the charge carrier separation but also provided more active sites for PS activation resulting in 6- and 3.5-fold higher photocatalytic activities compared to alpha-Fe2O3 and gamma-Fe2O3, respectively. Response surface methodology and artificial neural network coupled with genetic algorithm models were utilized to optimize and foresee Fe2O3/PS system under visible light. Almost 100% color removal and 82% organic removal were observed under the optimum conditions at 20 mg/L RR120, 22 mg/L beta-Fe2O3, 18 mg/L PS, and pH: 3. Scavenger test indicated that both sulfate and hydroxyl radicals are responsible for the observed RR120 removal. Although cell viability test indicated that cytotoxicity of wastewater is not significantly reduced after treatment. All the results proposed that beta-Fe2O3/PS at relatively low doses has a great potential to decompose and mineralize recalcitrant dyes in wastewater under invisible light. (AU)

• Processo FAPESP: 16/18057-7 - Redução de CO2 visando à geração de compostos de valor agregado por fotocatálise/fotoeletrocatálise utilizando líquido iônico em reator pressurizado
• Beneficiário: João Angelo de Lima Perini
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 19/00463-7 - Sistemas bioeletroquímicos integrados e fotoassistidos por luz solar para a produção de eletricidade e H2 a partir da digestão conjunta de glicerol bruto e água residuária da indústria citrícola
• Beneficiário: Lilian Danielle de Moura Torquato
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 14/50945-4 - INCT 2014: Instituto Nacional de Tecnologias Alternativas para Detecção, Avaliação Toxicológica e Remoção de Micropoluentes e Radioativos
• Beneficiário: Maria Valnice Boldrin
• Modalidade de apoio: Auxílio à Pesquisa - Temático