Novel-structured Mo-Cu-Fe-O composite for catalytic air oxidation of dye-containing wastewater under ambient temperature and pressure

doi:10.1016/S1872-2067(17)62884-5

Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (10): 1719-1725.DOI: 10.1016/S1872-2067(17)62884-5

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Novel-structured Mo-Cu-Fe-O composite for catalytic air oxidation of dye-containing wastewater under ambient temperature and pressure

Yin Xu, Henan Shao, Fei Ge, Yun Liu

Department of Environmental Science and Engineering, College of Environment and Resources, Xiangtan University, Xiangtan 411105, Hunan, China

Received:2017-05-08 Revised:2017-06-28 Online:2017-10-18 Published:2017-10-28
Contact: 10.1016/S1872-2067(17)62884-5
Supported by:
This work was supported by the National Natural Science Foundation of China (51678511, 51308484), the Natural Science Foundation of Hunan Province (13JJ4049), the Education Department Fund of Hunan Province (14C1094), the Open Fund of Key Laboratory of Mineralogy and Metallogeny in Chinese Academy of Sciences (KLMM20150104), the Major Talent Training Program of Xiangtan University (16PYZ09), and the Specialized Research Fund for the Doctoral Program of Xiangtan University (12QDZ18).

Abstract

Abstract:

A novel-structured Mo-Cu-Fe-O composite was successfully prepared by co-precipitation and impregnation method. The properties of the as-prepared samples were determined using X-ray diffraction, temperature-programmed reduction by H₂, cyclic voltammetry, and temperature-programmed desorption by O₂. The results showed that Mo⁶⁺ diffused into the Cu-Fe-O crystal lattice and then formed a new crystalline phase of CuMoO₄. The Mo-Cu-Fe-O catalyst had redox properties, and its surface contained active sites for oxygen adsorption. In addition, the catalytic activity of the Mo-Cu-Fe-O composite was evaluated by the degradation of Cationic Red GTL, Crystal Violet, and Acid Red in catalytic wet air oxidation (CWAO) at ambient temperature and pressure. The Mo-Cu-Fe-O catalyst showed excellent activity at basic conditions for the degradation of Cationic Red GTL. High removal efficiencies of 91.5% and 92.8% were achieved for Cationic Red GTL and Crystal Violet, respectively, in wastewater, and the efficiency remained high after seven cycles. However, almost no degradation of Acid Red occurred in the CWAO process. Furthermore, hydroxyl radicals were formed in the CWAO process, which induced the decomposition of the two cationic dyes in wastewater, and the toxicity of their effluents was decreased after degradation. The results indicate that the Mo-Cu-Fe-O composite shows excellent catalytic activity for the treatment of wastewater contaminated with cationic dyes.

Key words: Mo-Cu-Fe-O catalyst, Ambient temperature and pressure, Dye wastewater, Hydroxyl radical, Oxidative degradation

Yin Xu, Henan Shao, Fei Ge, Yun Liu. Novel-structured Mo-Cu-Fe-O composite for catalytic air oxidation of dye-containing wastewater under ambient temperature and pressure[J]. Chinese Journal of Catalysis, 2017, 38(10): 1719-1725.

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Novel-structured Mo-Cu-Fe-O composite for catalytic air oxidation of dye-containing wastewater under ambient temperature and pressure

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