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Membrane‐Solvothermal Synthesis of Cobalt Ferrite/Reduced Graphene Oxide Nanocomposites and Their Photocatalytic and Electromagnetic Wave Absorption Properties
Author(s) -
Guan XiaoHui,
Kuang JiaMin,
Yang Liu,
Lu Min,
Wang GuangSheng
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201901922
Subject(s) - graphene , materials science , photocatalysis , nanocomposite , oxide , reflection loss , photodegradation , cobalt , chemical engineering , composite material , nanotechnology , composite number , catalysis , metallurgy , chemistry , organic chemistry , engineering
Cobalt ferrite (CoFe 2 O 4 ) nanorods have been synthesized by a membrane‐solvothermal method and a series of CoFe 2 O 4 /rGO nanocomposites with different reduced graphene oxide (rGO) weight ratios of 5%, 10%, 15%, 20%, 25% and 30% have been synthesized via ultrasonic treatment, named as CoFe 2 O 4 /rGO‐1, CoFe 2 O 4 /rGO‐2, CoFe 2 O 4 /rGO‐3, CoFe 2 O 4 /rGO‐4, CoFe 2 O 4 /rGO‐5 and CoFe 2 O 4 /rGO‐6, respectively. The photocatalytic activity was studied by photodegradation of malachite green (MG), and the wave absorbing performance was studied by network vector analyzer. CoFe 2 O 4 had the function of magnetic separation, which had largely reduced the separation difficulty of photocatalyst and dye wastewater. Among all the graphene‐based composites, CoFe 2 O 4 /rGO‐5 has the most excellent photocatalytic performance which could eliminate about 93.48% of MG in 90 min. Even after five cycles, the photocatalytic degradation rate of MG was still above 88%, suggesting that CoFe 2 O 4 /rGO‐5 is a promising photocatalyst for recyclable utilization. The wave absorption test results showed that the electromagnetic wave reflection loss of CoFe 2 O 4 /rGO nanocomposites was lower than that of pure CoFe 2 O 4 , which showed that the addition of graphene could effectively enhance the absorbing properties of materials. When the thickness of the absorbing layer was 2.5 mm, the reflection loss of the CoFe 2 O 4 /rGO‐4 nanocomposite reached the maximum value of 17 GHz at ‐11.1 dB and the bandwidth of less than ‐10 dB was 2.3 GHz.