Meng F, Song M, Song B, Wei Y, Cao Q, Cao Y. Enhanced degradation of Rhodamine B via α-Fe
2O
3 microspheres induced persulfate to generate reactive oxidizing species.
CHEMOSPHERE 2020;
243:125322. [PMID:
31734592 DOI:
10.1016/j.chemosphere.2019.125322]
[Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 11/04/2019] [Accepted: 11/05/2019] [Indexed: 06/10/2023]
Abstract
The porous α-Fe2O3 microspheres (MS-Fe2O3) were obtained through in-situ ion exchange-calcination method and then utilized to activate persulfate (PS) for Rhodamine B (Rh B) degradation. The influences of some important operational parameters were investigated for the MS-Fe2O3/PS system. Additionally, the physicochemical properties of the as-fabricated MS-Fe2O3 were revealed with the assistance of some analytical instruments (i.e., X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectra (XPS), Brunauer-Emmett-Teller (BET) and vibrating sample magnetometer (VSM)). The results showed that the physicochemical properties of MS-Fe2O3 played an important role in the activation of PS, which promoted MS-Fe2O3 to effectively induce PS to generate reactive oxidizing species, thus Rh B could be nearly 100% degraded within 30 min under near-neutral pH solution. Noticeably, the as-prepared MS-Fe2O3 revealed magnetism and could be separated conveniently through external magnetic, which was beneficial to reuse the catalyst. Finally, the reactive oxidizing species (SO4- and OH) participating in the oxidation process were illustrated by electron paramagnetic resonance (EPR) and radical quenching studies, and then a rational mechanism was proposed to better understand the catalytic oxidation degradation of organic pollutants.
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