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Vol. 27 No. 10 (2015): Vol 27 Issue 10

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Colour and Chemical Oxygen Demand Removals in Oxidation of Reactive Blue 19 Using Wet Air Oxidation Catalyzed by Natural Ores

https://doi.org/10.14233/ajchem.2015.18994
V.N. Duy
Faculty of Chemistry, Hanoi University of Science, Vietnam National University, 19 Le Thanh Tong str., Hoan Kiem Dist., Hanoi, Vietnam
V.T. Hau
Faculty of Natural Science, University of Thai Nguyen, Quyet Thang Dist., Thai Nguyen City, Vietnam
L.V. Chieu
Research Center for Environmental Technology and Sustainable Development, Hanoi University of Science, Vietnam National University, T3 building, 334 Nguyen Trai str., Thanh Xuan Dist., Hanoi, Vietnam
C.T. Ha
Research Center for Environmental Technology and Sustainable Development, Hanoi University of Science, Vietnam National University, T3 building, 334 Nguyen Trai str., Thanh Xuan Dist., Hanoi, Vietnam

Corresponding Author(s) : C.T. Ha

caotheha@gmail.com; duyk44ahoahoc@yahoo.com

Asian Journal of Chemistry, Vol. 27 No. 10 (2015): Vol 27 Issue 10

Abstract

Four natural ores of iron and manganese (Mn-CB, Mn-HG, Mn-TG, Fe-TC) selected in Vietnam were used as catalysts for oxidation of Reactive blue 19 in catalytic wet air oxidation process (CWAO). The manganese containing ores were found to be very effective for colour treatment (up to 94 %) at 150 °C and 13 bar of oxygen. However they show much lower efficiency in chemical oxygen demand removal with a maximum value of 33 %. That reveals manganese ores only boost partial oxidation of the dye molecule. The iron ore, in another hand, exhibits both low colour and chemical oxygen demand removals but complete destruction of the dye molecule can be achieved. Kinetics of the colour destruction was investigated using Mn-CB ore. The rate of the process can be described by the expression w = k·[RB19]a·PO2b·[cat.]c with a = 0.55, b = 0.40, c = 1.2 and k = 2.6 × 10-2 (L0.75 mg0.45 g-1.2 bar-0.41 min-1).

Keywords

Wet air oxidation Reactive blue 19 Natural ore Catalyst Colour removal
Duy, V., Hau, V., Chieu, L., & Ha, C. (2015). Colour and Chemical Oxygen Demand Removals in Oxidation of Reactive Blue 19 Using Wet Air Oxidation Catalyzed by Natural Ores. Asian Journal of Chemistry, 27(10), 3809–3812. https://doi.org/10.14233/ajchem.2015.18994
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