SYNTHESIS AND CHARACTERIZATION OF Al/Fe PILLARED SEPIOLITE FOR CWPO OF METHYL ORANGE

Abstract

In this study, Al/Fe pillared sepiolite catalysts with different Fe/(Al+Fe) molar ratios were synthesized for catalytic wet peroxide oxidation (CWPO) of methyl orange azo dye. Furthermore, the catalysts were characterized by BET, XRD, XRF and SEM-EDX techniques. The catalysts were very efficient in the methyl orange oxidation reaction in diluted aqueous medium under mild experimental conditions (25°C and atmospheric pressure). 90.68% methyl orange elimination was achieved at 4 hours of reaction time under the conditions of 0.1 g/100 mL for catalyst dosage, 8% for active metal ratio, 500°C for calcination temperature, 3.7 for pH, 0.15 M for H₂O₂ concentration and 25°C for temperature. Meanwhile, low loss of Fe species was observed on all of the catalysts.

Keywords

• Azo dye methyl orange,catalytic wet peroxide oxidation,pillared clays,sepiolite

References

1. Catrinescu, C., Arsene, D. & Teodosiu, C. (2011). Catalytic wet hydrogen peroxide oxidation of para-chlorophenol over Al/Fe pillared clays (AlFePILCs) prepared from different host clays. Applied Catalysis B: Environmental, 101, 451-460. Fathy, N.A., El-Khouly, S.M., Hassan, N.A. & Awad, R.M.S. (2017). Free- and Ni-doped carbon xerogels catalysts for wet peroxide oxidation of methyl orange. Journal of Water Process Engineering, 16, 21-27. Galeano, L.A., Gil, A. & Vicente, M.A., (2010). Effect of the atomic active metal ratio in Al/Fe-, Al/Cu- and Al/(Fe-Cu)-intercalating solutions on the physicochemical properties and catalytic activity of pillared clays in the CWPO of methyl orange. Applied Catalysis B: Environmental, 100, 271-281. Han, J., Zeng, H.Y., Xu, S., Chen, C.R. & Liu, X.J. (2016). Catalytic properties of CuMgAlO catalyst and degradation mechanism in CWPO of methyl orange. Applied Catalysis A: General, 527, 72-80. Özcan, A.S., & Gök, Ö. (2012). Structural characterization of dodecyltrimethylammonium (DTMA) bromide modified sepiolite and its adsorption isotherm studies. Journal of Molecular Structure, 1001, 36-42. Priyanka, Subbaramaiah, V.,Srivastava, V.C. &Mall, I.D. (2014). Catalytic oxidation of nitrobenzene by copper loaded activated carbon. Separation and Purification Technology, 125, 284-290. Zhou, S., Zhang, C., Hu, X., Wang, Y., Xu, R., Xia C., Zhang, H. & Song, Z. (2014). Catalytic wet peroxide oxidation of 4-chlorophenol over Al-Fe-, Al-Cu-, and AL-Fe-Cu-pillared clays: Sensitivity, kinetics and mechanism. Applied Clay Science, 95, 275-283.