Organics Wastewater Degradation by a Mesoporous Chromium-Functionalized γ-Al2O3 with H2O2 Assistance
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In this study, a mesoporous chromium-functionalized γ-Al2O3 (Cr/γ-Al2O3) catalyst was prepared by an impregnation method, and the catalytic activity was evaluated by the degradation of organics wastewater. The prepared catalyst was characterized by X-ray photoelectron spectroscopy, X-ray diffraction, nitrogen adsorption-desorption experiments, and scanning electron microscopy. The characterization results confirmed that the pores in the Cr/γ-Al2O3 catalyst distributed broadly in the mesoporous region, and the active chromium species were highly dispersed on the catalyst surface. The catalytic activity tests showed that the Cr/γ-Al2O3 catalyst exhibited a superior performance for the degradation of organics wastewater with H2O2 assistance. And the methylene blue (MB) disappeared within 20 min and the COD removal reached 76.5% within 40 min for the MB-simulated wastewater; for the phenol-simulated wastewater, the phenol removal was above 95% and the corresponding COD removal reached 71% within 40 min. Such an excellent catalytic performance demonstrates that the Cr/γ-Al2O3 catalyst has a potential application in the degradation of complex organics wastewater simultaneously.
KeywordsCr/γ-Al2O3 catalyst Catalytic degradation Organics wastewater COD removal
The authors acknowledge the support of the Natural Science Research Key Project of the Anhui Provincial Department of Education (Grant KJ2015A231).
- Li, J., Xu, L., Sun, P., Zhai, P., Chen, X., Zhang, H., Zhang, Z., & Zhu, W. (2017). Novel application of red mud: Facile hydrothermal-thermal conversion synthesis of hierarchical porous AlOOH and Al2O3 microspheres as adsorbents for dye removal. Chemical Engineering Journal, 321, 622–634.CrossRefGoogle Scholar
- Liu, B., Sindelar, P., Fang, Y., Hasebe, K., & Terano, M. (2005). Correlation of oxidation states of surface chromium species with ethylene polymerization activity for Phillips CrOx/SiO2 catalysts modified by Al-alkyl cocatalyst. Journal of Molecular Catalysis A: Chemical, 238(1–2), 142–150.Google Scholar
- Naik, B., Moitra, D., Dayananda, D., Hazra, S., Ghosh, B. K., Prasad, S. V., & Ghosh, N. N. (2016). A facile method for preparation of TiO2 nanoparticle loaded mesoporous γ-Al2O3: an efficient but cost-effective catalyst for dye degradation. Journal of Nanoscience and Nanotechnology, 16(8), 8544–8549.CrossRefGoogle Scholar
- Su, J., Zhang, Y., Xu, S., Wang, S., Ding, H., Pan, S., Wang, G., Li, G., & Zhao, H. (2014). Highly efficient and recyclable triple-shelled Ag@Fe3O4@SiO2@TiO2 photocatalysts for degradation of organic pollutants and reduction of hexavalent chromium ions. Nanoscale, 6(10), 5181–5192.CrossRefGoogle Scholar