Statistical optimization of Reactive Red 141 removal by heterogeneous photo–Fenton reaction using ZnFe2O4 oxide prepared by microwave irradiation

Abstract

A B S T R A C TA statistical optimization of Reactive Red 141 (RR141) removal by heterogeneous photoFenton reaction using ZnFe 2 O 4 particles was performed. ZnFe 2 O 4 oxide was synthesized by microwave-assisted solvothermal route and characterized by X-ray diffraction, Fourier transform infrared spectroscopy, and N 2 adsorption-desorption isotherms. This material was used as a catalyst for the removal of RR141 dye from aqueous solution. Statistical optimization for the RR141 removal was performed using a 2 4−1 fractional experimental design, followed by the response surface methodology. Effects of pH, reaction time, dye concentration, and H 2 O 2 concentration were evaluated. ZnFe 2 O 4 particles presented a mesoporous structure with surface area of 65 m 2 g −1 . It was found that the more adequate conditions for the RR141 dye removal were pH 2.0, reaction time of 60 min, dye concentration of 60 mg L −1 , and H 2 O 2 concentration of 10 mM. In these conditions, 90% of color removal was achieved. The results demonstrate that the ZnFe 2 O 4 oxide is an efficient catalyst for the removal of RR141dye from aqueous solution through the heterogeneous photo-Fenton reaction.

Preparation of Mesoporous Fe2O3-Supported ZSM-5 Zeolites by Carbon-Templating and their Evaluation as Photo-Fenton Catalysts to Degrade Organic Pollutant

“…Stringhini et al 35 observed a total dye removal at 120 min of reaction using ZnAl 2 O 4 catalyst under UV irradiation, whereas Foletto et al 24 obtained total removal at 180 min using the same catalyst, but under sunlight. ZnFe 2 O 4 catalyst prepared by microwave irradiation showed 90% of dye removal at 60 min of reaction under visible light 36 . Therefore, the results obtained in this work demonstrate that the mesoporous Fe 2 O 3 -supported ZSM-5 zeolites are efficient catalysts for the removal of Reactive Red 141 dye from aqueous solution.…”

Synthesis, characterization and application of Clinoptilolite-based catalysts for the degradation of Reactive Blue dye via photo-Fenton process

“…Para a avaliação fotocatalítica foram executados 15 testes reacionais em duplicata seguindo um planejamento experimental do tipo Box-Behnken explicitado pela Tabela 2 com três fatores (pH, concentração de catalisador e tempo de reação), cujos níveis foram retirados da literatura (Anchieta et al, 2016), sendo a variável dependente o rendimento percentual médio (R) do processo foto-Fenton, dado por Eq. (1).…”

Preparação do sistema Fe2O3/ZSM-5 para uso como catalisador na reação foto-Fenton

“…Nas últimas décadas, processos oxidativos avançados (POAs) têm recebido grande destaque por ser uma tecnologia emergente para a degradação de poluentes orgânicos em efluentes aquosos. Dentre os diversos tipos de POAs existentes [4], a reação heterogênea Fenton tem sido empregada com sucesso na degradação de diversos poluentes orgânicos [5][6][7]. A tecnologia Fenton consiste na combinação de peróxido de hidrogênio e cátions de ferro em um meio aquoso, produzindo radicais altamente reativos (HO • ) [8], levando à oxidação do poluente orgânico.…”