Preparation, characterization and catalytic evaluation of Fe<sub>2</sub>O<sub>3</sub>/graphite composite in photo-Fenton reaction

Grassi, Patrícia; Drumm, Fernanda Caroline; Georgin, Jordana; Tonato, Denise; Foletto, Edson Luiz; Jahn, Sérgio Luiz

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Artigos • Matéria (Rio J.) 24 (3) • 2019 • https://doi.org/10.1590/S1517-707620190003.0749 copy

Preparation, characterization and catalytic evaluation of Fe₂O₃/graphite composite in photo-Fenton reaction

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

In this work, Fe₂O₃/graphite composite was prepared and used as a catalyst in photo-Fenton reaction for the decolorization of amaranth dye from aqueous solution under visible light irradiation. Samples with different Fe₂O₃ contents supported on graphite were prepared and characterized by X-ray diffraction (XRD), N₂ adsorption-desorption and scanning electron microscopy (SEM). The increase of the iron content in the composites resulted in a superior specific surface area. The response surface methodology generated from the Rotational Central Composite Design (RCCD) showed a maximum efficiency in the decolorization of the dye solution of 93% under the optimal experimental conditions of photo-Fenton reaction (pH = 2.5, amount of catalyst = 0.35 g L^-1 and molar ratio H₂O₂/Ʃ mineralizable compounds: 4.7). Therefore, the Fe₂O₃/graphite composite can be used as a potential photo-Fenton catalyst for the degradation of amaranth dye from liquid effluents.

Keywords
photo-Fenton; composite; Fe₂O₃/graphite; decolorization; amaranth; RCCD

Variáveis independentes	Valores reais dos níveis codificados
	-1,68	-1	0	1	1,68
pH (X₁)	2	2,4	3	3,6	4
Quantidade de catalisador (X₂, g L^-1)	0,05	0,13	0,25	0,37	0,45
H₂O₂/Σ elementos mineralizáveis (X₃)	1	1,8	3	4,2	5

Amostra	Área de superfície (BET) (m² g ^-1)	Diâmetro médio do poro (nm)	Volume total de poros (cm³ g^-1)
Grafite	3,6	21,8	0,0297
G1	4,5	19,1	0,0211
G2.5	8,8	15,2	0,0195
G5	10,7	13,7	0,0162
G10	22,2	11,4	0,0083
G15	38,9	8,6	0,0073

Ensaio	pH	Catalisador	H₂O₂/Σ elementos mineralizáveis	ED (%)
1	-1(2,4)	-1(0,13)	-1(1,8)	32,45
2	1(3,6)	-1(0,13)	-1(1,8)	30,80
3	-1(2,4)	1(0,37)	-1(1,8)	53,60
4	1(3,6)	1(0,37)	-1(1,8)	48,72
5	-1(2,4)	-1(0,13)	1(4,2)	67,03
6	1(3,6)	-1(0,13)	1(4,2)	40,95
7	-1(2,4)	1(0,37)	1(4,2)	91,71
8	1(3,6)	1(0,37)	1(4,2)	50,73
9	-1,68(2)	0(0,25)	0(3)	45,69
10	1,68(4)	0(0,25)	0(3)	29,21
11	0(3)	-1,68(0,05)	0(3)	1,050
12	0(3)	1,68(0,45)	0(3)	59,54
13	0(3)	0(0,25)	-1,68(1)	38,43
14	0(3)	0(0,25)	1,68(5)	86,21
15	0(3)	0(0,25)	0(3)	78,66
16	0(3)	0(0,25)	0(3)	75,96
17	0(3)	0(0,25)	0(3)	79,68

Fonte de variação	Soma dos Quadrados	Graus de liberdade	Quadrado médio	F_CAL	p-valor
Regressão	8581,86	8	1072,73	11,20	< 0,05
Resíduo	765,98	8	95,74	-	-
Falta de ajuste	758,59	6	-	-	-
Erro puro	7,39	2	-	-	-
Total	9347,84	16	-	-	-

Ensaio	ED, %	Diminuição da atividade catalítica (%)	Ferro lixiviado (mg L^-1)
1	93	0	3,15
2	90	3,2	2,41
3	87	6,4	2,01

Laboratório de Hidrogênio, Coppe - Universidade Federal do Rio de Janeiro, em cooperação com a Associação Brasileira do Hidrogênio, ABH2 Av. Moniz Aragão, 207, 21941-594, Rio de Janeiro, RJ, Brasil, Tel: +55 (21) 3938-8791 - Rio de Janeiro - RJ - Brazil
E-mail: revmateria@gmail.com

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[1] e-mail: engpatriciagrassi@gmail.com, fernandacarolinedrumm@hotmail.com, denise.tonato@hotmail.com, efoletto@gmail.com, jahn@smail.ufsm.br, jordana_gin@hotmail.com

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Preparation, characterization and catalytic evaluation of Fe2O3/graphite composite in photo-Fenton reaction

ABSTRACT

Preparation, characterization and catalytic evaluation of Fe₂O₃/graphite composite in photo-Fenton reaction