期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 213, 期 -, 页码 456-464出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2018.12.049
关键词
PMS; MnO2/MnFe2O4; Magnetism; SO4 center dot-; Mechanism
资金
- National Natural Science Foundation of China [51508254, 41771341]
- Fundamental Research Funds for the Central Universities [lzujbky-2017-it98]
- National College student innovation and Entrepreneurship training program of Lanzhou University
- Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lake, Chinese Academy of Sciences
Novel magnetic MnO2/MnFe2O4 nanocomposite was successfully fabricated by hydrothermal method. Subsequently, this nanocomposite was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microcopy (TEM), X-ray photoelectron spectra (XPS), vibrating sample magnetometer (VSM) and Brunauer-Emmett-Teller (BET) measurements. Then the material was applied to activate PMS for Rhodamine B (Rh B) degradation. The results displayed that the decomposition efficiency of the MnO2/MnFe2O4 nanocomposite with a mole ratio of 7:1 was 90% for Rh B within 5 min in the presence of PMS, higher than other MnO2/MnFe2O4 ratio, homogeneous catalysts (Fe3+ and Mn2+), pure MnO2 and pure MnFe2O4. In addition, influences of pivotal factors (PMS concentration, catalyst dosage and initial pH value), performance of different processes and reusability of MnO2/MnFe2O4 nanocomposite were also evaluated. Radical scavenging experiments were conducted and SO4 center dot- was indicated as the primary radical. What's more, the MnO2/MnFe2O4 nanocomposite could be convenient to recycle in practical application benefited from its magnetism. Finally, according to the results and previous studies, the believable mechanism of activating PMS by MnO2/MnFe2O4 nanocomposite was put forward, which could occupy an important position as a fast treatment option in sewage disposal.
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