Modified carbide-derived carbons used in the catalytic wet peroxide oxidation of oily wastewaters

• Type: Article in International Conference Proceedings Book
• Date: 2018

Authors

Díaz de Tuesta, Jose Luis (Author) Other; Munoz, Macarena (Author) Other; Domínguez, Carmen M. (Author) Other; Casas, Jose A. (Author) Other; Gläsel, Jan (Author) Other; Etzold, Bernard (Author) Other; Silva, Adrian (Author) FEUP; Faria, Joaquim (Author) Other; Gomes, Helder (Author) Other

Conference proceedings International

Title: CarboCat VIII - 8th International Symposium on Carbon for Catalysis

Other information

Authenticus ID: P-011-1YM

Abstract (EN): 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 ¿m) 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.

Language: English

Type (Professor's evaluation): Scientific