期刊
MATERIALS RESEARCH EXPRESS
卷 6, 期 7, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2053-1591/ab1289
关键词
spinel crystal; adsorbent; microwave absorption; pollution abatement
资金
- National Natural Science Foundation of China [21471147]
- Liaoning Provincial Natural Science Foundation [2014020087]
- Talented Young's Scientist Program (TYSP) by Ministry of Science& Technology (MoST) China
- Department of Science and Technology (Govt. of India)
- Indian Institute of Technology Madras
- National 'Thousand Youth Talents' program of China
Achieving optimal morphologies specific for applications continues to be a challenge in the case of mesoporous ceramic oxide materials. It is well known that for several applications, nanograins need to remain un-agglomerated; this is because such particles offer larger specific surface. Here a novel template, economic route has been used for the synthesis of magnetic cobalt iron oxide with a hierarchical (and hence extended surface) morphology. These microspheres exhibit a high surface area of 786 m(2) g(-1) with large pore density. The particles are found to be excellent adsorbents and catalysts for oxidative-dissociation of Rhodamine B (RhB) and 4-Nitrophenol (4-NP) from water at room temperature. We also report the microwave absorbing capabilities of these materials, in the frequency range 1 MHz to 3 GHz. Interestingly these extended surface microspheres possess fine absorption of microwaves with two broad reflection loss peaks at -59 dB and -49.85 dB in the entire range. This is substantially different from the smooth surface cobalt ferrite that possesses only one absorption peak (-41.9 dB) in the low frequency region. Hence the reported material has plausible applications as magnetic adsorbents for pollution abatement, and also as electromagnetic shields.
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