Catalytic ozonation performance and surface property of supported Fe<sub>3</sub>O<sub>4</sub> catalysts dispersions

doi:10.1007/s11783-013-0509-0

Front Envir Sci Eng

2013, Vol. 7

Issue (3) : 451-456 https://doi.org/10.1007/s11783-013-0509-0

RESEARCH ARTICLE

Catalytic ozonation performance and surface property of supported Fe₃O₄ catalysts dispersions

Zhendong YANG, Aihua LV, Yulun NIE(

), Chun HU(

)

State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

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Abstract

Fe₃O₄ was supported on mesoporous Al₂O₃ or SiO₂ (50 wt.%) using an incipient wetness impregnation method, and Fe₃O₄/Al₂O₃ exhibited higher catalytic efficiency for the degradation of 2,4-dichlorophenoxyacetic acid and para-chlorobenzoic acid aqueous solution with ozone. The effect and morphology of supported Fe₃O₄ on catalytic ozonation performance were investigated based on the characterization results of X-ray diffraction, X-ray photoelectron spectroscopy, BET analysis and Fourier transform infrared spectroscopy. The results indicated that the physical and chemical properties of the catalyst supports especially their Lewis acid sites had a significant influence on the catalytic activity. In comparison with SiO₂, more Lewis acid sites existed on the surface of Al₂O₃, resulting in higher catalytic ozonation activity. During the reaction process, no significant Fe ions release was observed. Moreover, Fe₃O₄/Al₂O₃ exhibited stable structure and activity after successive cyclic experiments. The results indicated that the catalyst is a promising ozonation catalyst with magnetic separation in drinking water treatment.

Keywords heterogeneous catalytic ozonation iron oxides supports surface Lewis acid sites

Corresponding Author(s): NIE Yulun,Email:ylnie@rcees.ac.cn (Y.L. Nie); HU Chun,Email:huchun@rcees.ac.cn (C. Hu)

Issue Date: 01 June 2013

Cite this article:

Zhendong YANG,Aihua LV,Yulun NIE, et al. Catalytic ozonation performance and surface property of supported Fe₃O₄ catalysts dispersions[J]. Front Envir Sci Eng, 2013, 7(3): 451-456.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-013-0509-0
https://academic.hep.com.cn/fese/EN/Y2013/V7/I3/451

Fig.1 XRD patterns of (a) FeO/AlO, (b) FeO/SiO

Fig.2 XPS spectra of (a) FeO/AlO, (b) FeO/SiO

Fig.3 Room-temperature magnetization loops of FeO/AlO and FeO/SiO

Fig.4 N adsorption-desorption isotherms (A) and pore size distribution (B) of (a) FeO/SiO, (b) FeO/AlO

Tab.1 BET area and pore size distribution of different samples

Fig.5 FTIR spectra of pyridine adsorbed on (a) AlO, (b) SiO at 473 K

Tab.2 Surface acidities of AlO and SiO

Fig.6 TOC removal during the 2,4-D degradation process in aqueous dispersions of various catalysts with ozone: (a) no catalyst, (b) FeO, (c) FeO/SiO, (d) FeO/AlO. (pH= 6, 2,4-D= 20 mg·L, catalyst= 1 g·L, gaseous ozone concentration= 30 mg·L)

Fig.7 CBA removal under different conditions: (a) adsorption on FeO/AlO, (b) O alone, (c) FeO/AlO with O. (pH= 6, CBA= 10 mg·L, catalyst= 1 g·L, gaseous ozone concentration= 30 mg·L)

Fig.8 TOC removal during multicycle degradation of 2,4-D over FeO/AlO with ozone. (pH= 6, 2,4-D= 20 mg·L, catalyst= 1 g·L, gaseous ozone concentration= 30 mg·L)

Fig.9 XRD patterns of FeO and FeO/AlO before and after reaction: (a) FeO, (b) FeO after reaction, (c) FeO/AlO, (d) FeO/AlO after reaction

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