화학공학소재연구정보센터
Chemical Engineering Journal, Vol.318, 153-160, 2017
CWPO of bisphenol A with iron catalysts supported on microporous carbons from grape seeds activation
The catalytic wet peroxide oxidation (CWPO) of bisphenol A (BPA) with Fe catalysts supported on activated carbon from grape seeds (GS) has been studied. The GS were pyrolized (N-2, 600 degrees C, 2 h) and subjected to activation upon partial gasification with air (400 degrees C, 2 h). Oxidized samples of the char and activated carbon were also obtained upon treatment with HNO3. The Fe catalysts were prepared by incipient wetness impregnation with ferric nitrate solution. They showed narrow microporosity, with surface area values approximate to 350-500 m(2) g(-1) and total iron contents between 2.8 and 4.2% wt. The CWPO experiments were carried out at 50-80 degrees C. The best catalyst allowed complete conversion of BPA (100 mg L-1) and a 60% TOC reduction in 3 h reaction time at 80 degrees C and the theoretical stoichiometric amount of H2O2 (530 mg L-1). The ecotoxicity of the effluent was negligible and the biodegradability was highly improved. In a long-term experiment (100 h), the catalyst suffered a loss of activity upon the early stages on stream (approximate to 15 h), where about 20% of Fe was lost, followed by a highly stable behavior for the rest of the experiment. (C) 2016 Elsevier B.V. All rights reserved.