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Synthetic dyes in the aquatic environment caused various ecological and health problems that are detrimental to sustainable development. To solve these problems, we designed a dense Fe 3 Ni 2 phase alloy film (FeNi-M) on copper substrate by the directional magnetic field-assisted wet chemical film formation method. The degradation and adsorption of Congo red (CR) in water were achieved by using the surface activity of the film. The degradation rate of FeNi-M alloy film reached 99.5% at 48 h and the k obs is 0.10982 h−1, which is 2.1 and 7.5 times of FeNi alloy film (0.05147 h−1) and Ni film （0.01465 h−1）, respectively. The degradation processes of all three films were in accordance with the pseudo-first-order kinetic model. In addition, FeNi-M alloy films have excellent cycling performance with more than 90% removal rate after 5 cycles. We also discussed the possible degradation mechanism and pathway of CR. We speculated that the main part of alloy responsible for providing electrons were iron atoms and very few electrons were produced by nickel. However, nickel was beneficial to increase the activity of iron atoms and played a catalytic role, thereby greatly enhancing the efficiency of iron atoms on the reaction. Synthetic dyes in the aquatic environment caused various ecological and health problems that are detrimental to sustainable development. To solve these problems, we designed a dense Fe 3 Ni 2 phase alloy film (FeNi-M) on copper substrate by the directional magnetic field-assisted wet chemical film formation method. The degradation and adsorption of Congo red (CR) in water were achieved by using the surface activity of the film. The degradation rate of FeNi-M alloy film reached 99.5% at 48 h and the k obs is 0.10982 h−1, which is 2.1 and 7.5 times of FeNi alloy film (0.05147 h−1) and Ni film （0.01465 h−1）, respectively. The degradation processes of all three films were in accordance with the pseudo-first-order kinetic model. In addition, FeNi-M alloy films have excellent cycling performance with more than 90% removal rate after 5 cycles. [Display omitted] The data that support the findings of this study are available from the corresponding author upon reasonable request. [ABSTRACT FROM AUTHOR]

To meet the current requirements for absorbing materials with broadband, lower thickness, and lower density, the FeNi@C@Fe 3 O 4 magnetic powders with a density of 1.75 g/cm3 are constructed by the hydrothermal method and the liquid phase reduction method. The powders have good matching performance with air impedance in the band of 0.3 GHz ~ 18 GHz, and can consider both dielectric loss and magnetic loss-absorbing mechanisms. The loss tangent, tgδ, of the powders is 0.4–0.5. The powder coat is designed by using the interference absorption mechanism. When the thickness of the coat is 1.8 mm, the absorption peak of the coat is about − 30 dB. The coat has a maximum of effective absorption band for 12.2 GHz ~ 17.3 GHz, and the effective absorption bandwidth is 5.1 GHz. When the glass fiber/epoxy resin composite material of thickness 0.5 mm is coated on the FCFp coat of thickness 1.7 mm, the effective absorption band is further widened to 11.9 GHz ~ 17.6 GHz, and the effective absorption bandwidth reaches 5.7 GHz. The FeNi@C@Fe 3 O 4 powders have the characteristics of dielectric and magnetic loss-absorbing materials, and have the remarkable advantages of the wider effective absorption bandwidth and the lower density, which is a kind of high-efficiency absorbing material with outstanding comprehensive absorption performance. [Display omitted] [ABSTRACT FROM AUTHOR]