Hierarchical structured ZnFe 2 O 4 @reduced graphite oxide@TiO 2 (ZnFe 2 O 4 @RGO@TiO 2 ) nanocomposite was prepared by an electrostatic layer-by-layer route, which played a synthetic effect of Fenton oxidation of ZnFe 2 O 4 and photocatalytic oxidation of TiO 2 to degrade fulvic acid (FA) solution under visible-light irradiation. In this method, RGO, as the middle layer, can effectively promote the photo-induced electron flow between the ZnFe 2 O 4 and TiO 2 and further improve the efficiency of the photo-Fenton oxidation. The influencing factors on photo-Fenton oxidation, including solution pH, catalyst, and H 2 O 2 dosage, have also been investigated. The results illustrated that the ternary composite presented the enhanced catalytic performance. Under visible light irradiation, the degradation efficiency of the sample on the FA solution can reach 95.4% within 3 h. In addition, the catalyst exhibited superior stability and reusability, and its degradation efficiency was still up to 90% after 5 cycles. Therefore, the composite will be a kind of efficient photocatalyst and had a promising application for visible-light driven destruction of organic pollutants.
A series of yolk–shell ZnFe2O4@reduced graphite oxide@TiO2 (ZFO@RGO@TiO2) microspheres with different void sizes and TiO2 shell thicknesses has been successfully synthesized by combining a layer-by-layer coating process and chemical etching route. Compared to pure ZFO and hierarchical ZFO@SiO2@RGO@TiO2, the as-synthesized yolk–shell microspheres exhibited significantly enhanced microwave absorption properties in terms of effective bandwidth and reflection loss. Among these, the minimum reflection loss of the as-synthesized yolk–shell microspheres with a thickness of 2.6 mm could reach up to −44.3 dB at 15.92 GHz, and their effective absorption bandwidth at less than −10 dB was 4.1 GHz. In addition, as the shell thickness of the yolk–shell microspheres decreased, the frequency corresponding to the minimum reflection loss shifted to the high-frequency range. Hence, these obtained yolk–shell microspheres are potential new candidates for high-frequency shielding and lightweight microwave absorbing materials.
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