Publicação
Modified carbide-derived carbons used in the catalytic wet peroxide oxidation of oily wastewaters
| Resumo: | Modified carbide-derived carbon (CDC) materials, prepared from TiC, were tested as catalysts in the decomposition of H2O2 and in the catalytic wet peroxide oxidation (CWPO) of 4-nitrophenol (4-NP), either in aqueous phase or in biphasic medium. The reactive extraction of Ti from the metal carbide (2 μm) was carried out to prepare the CDC materials, as described elsewhere [1]. Briefly, 0.03 m s−1 Cl2 gas was used (1.5 mol m−3 in He) as extraction agent during 5 h at 800, 1000 and 1200 ºC. Afterwards, H2 was used for 0.5 h at the extraction temperature to remove residual chlorine, resulting in CDC-800, CDC-1000 and CDC-1200 materials, respectively. Additionally, CDC-800 was treated with a mixture of 98% H2SO4 and 30% w/v H2O2 (3:1) at room temperature for 3 h by two methods: (1) wetting the material in the oxidative solution and (2) oxidizing the material partially encapsulated with WAX paraffin, resulting in CDC-800-Ox and CDC-800-Wax, respectively. Firstly, the materials were tested in the decomposition of H2O2 and, then, in the adsorption and CWPO of 4-NP, adapting the experimental procedure described in previous works [2-3] at the following operating conditions: 25-50 ºC, pH0 = 3.0, and concentrations of solid material, 4-NP and H2O2 of 2.5 g/L, 5.0 g/L and 17.8 g/L, respectively. Cyclohexane, c-C6 (O/W volume ratio = 1:5) was used to simulate oily wastewater and study the influence of the oil phase presence in the medium. |
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| Autores principais: | Díaz de Tuesta, Jose Luis |
| Outros Autores: | Munoz, Macarena; Domínguez, Carmen M.; Casas, Jose A.; Gläsel, Jan; Etzold, Bernard; Silva, Adrián; Faria, Joaquim; Gomes, Helder |
| Ano: | 2018 |
| País: | Portugal |
| Tipo de documento: | documento de conferência |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Instituto Politécnico de Bragança |
| Idioma: | inglês |
| Origem: | Biblioteca Digital do IPB |
| Resumo: | Modified carbide-derived carbon (CDC) materials, prepared from TiC, were tested as catalysts in the decomposition of H2O2 and in the catalytic wet peroxide oxidation (CWPO) of 4-nitrophenol (4-NP), either in aqueous phase or in biphasic medium. The reactive extraction of Ti from the metal carbide (2 μm) was carried out to prepare the CDC materials, as described elsewhere [1]. Briefly, 0.03 m s−1 Cl2 gas was used (1.5 mol m−3 in He) as extraction agent during 5 h at 800, 1000 and 1200 ºC. Afterwards, H2 was used for 0.5 h at the extraction temperature to remove residual chlorine, resulting in CDC-800, CDC-1000 and CDC-1200 materials, respectively. Additionally, CDC-800 was treated with a mixture of 98% H2SO4 and 30% w/v H2O2 (3:1) at room temperature for 3 h by two methods: (1) wetting the material in the oxidative solution and (2) oxidizing the material partially encapsulated with WAX paraffin, resulting in CDC-800-Ox and CDC-800-Wax, respectively. Firstly, the materials were tested in the decomposition of H2O2 and, then, in the adsorption and CWPO of 4-NP, adapting the experimental procedure described in previous works [2-3] at the following operating conditions: 25-50 ºC, pH0 = 3.0, and concentrations of solid material, 4-NP and H2O2 of 2.5 g/L, 5.0 g/L and 17.8 g/L, respectively. Cyclohexane, c-C6 (O/W volume ratio = 1:5) was used to simulate oily wastewater and study the influence of the oil phase presence in the medium. |
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