介孔Fe/SBA-15非均相芬顿氧化水中难降解染料罗丹明B

doi:10.3866/PKU.WHXB201503023

Abstract

Abstract:

An Fe-loaded mesoporous silica SBA-15, Fe/SBA-15, was prepared by incipient wetness impregnation, characterized by X-ray diffraction (XRD), N₂ adsorption-desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) techniques and used for heterogeneous Fenton oxidation of dye Rhodamine B (RhB) in aqueous solution. The characterization showed that the Fe/SBA-15 retained a mesoporous structure with a long-range ordered arrangement, reduced pore diameter and surface area, and existed as agglomerates of rod-like crystallites with a mean diameter of 0.6 μm. The Fe species occurred both inside and outside the support pores in the form of α-Fe₂O₃ crystallites. The removal of RhB in the presence of Fe/SBA-15 and H₂O₂ was shown to be caused by the synergistic effects of adsorption and catalytic oxidative degradation, and was closely related to Fe/SBA-15 dosage. Removal was almost independent of initial solution pH, with approximately 93% achieved at an Fe/SBA-15 dosage of 0.15 g·L^-1, initial RhB concentration of 10.0 mg·L^-1, H₂O₂/Fe³⁺ molar ratio of 2000:1; initial solution pH of 5.4 and 21 ℃. The Langmuir monolayer adsorption capacity of the Fe/SBA-15 was 99.11 mg·g^-1. In addition, Fe/SBA-15 can be easily regenerated by soaking in H₂O₂ then reused for up to six runs, with RhB removal greater than 80% and Fe leaching below 0.1 mg·L^-1 (or 0.6% (mass fraction)) for each run. A removal mechanism for RhB by Fe/SBA-15 and H₂O₂ was proposed based on the quenching tests, UV-Vis spectra, and gas chromatography-mass spectrometry (GC-MS) analysis. The heterogeneous Fenton catalyst Fe/SBA-15 can be applied to remove nonbiodegradable organics such as dye RhB.

Key words: Heterogeneous Fenton oxidation, Adsorption, Fe/SBA-15, Rhodamine B, Hydroxyl radical

HU Long-Xing, XU Dan-Dan, ZOU Lian-Pei, YUAN Hang, HU Xing. Heterogeneous Fenton Oxidation of Refractory Dye Rhodamine B in Aqueous Solution with Mesoporous Fe/SBA-15[J]. Acta Phys. -Chim. Sin. 2015, 31(4), 771-782. doi: 10.3866/PKU.WHXB201503023

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Heterogeneous Fenton Oxidation of Refractory Dye Rhodamine B in Aqueous Solution with Mesoporous Fe/SBA-15

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