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In this work, Fe 3 O 4 /B 4 C (FeB) composites were successfully prepared by a facile co-precipitation process. FeB composites were characterized using XRD, FTIR, N 2 adsorption-desorption, XPS, etc techniques and then used as heterogeneous Fenton catalysts to activate green oxidant (H 2 O 2) for the degradation of TCH. The removal efficiency of TCH by FeB composites was explored including different parameters of Fe 3 O 4 loading on B 4 C, catalyst dosage, initial solution pH, H 2 O 2 dosage, and reaction temperature. The highest photo-Fenton catalytic efficiency was obtained for the composites with a mass ratio of Fe 3 O 4 to B 4 C of 1:0.75. At this time, the removal efficiency of Fe 3 O 4 /B 4 C was 2 times and 391 times that of the parent Fe 3 O 4 and B 4 C, respectively, and B 4 C can effectively improve the efficiency of the Fenton cycle. h+, e-, and ·OH were mainly responsible for the degradation of TCH by Fe 1 B 0.75 composites. After repeated use for five times, the removal efficiency of the catalyst was reduced by only 8.0%. The disparity in work functions by density functional theory calculations confirmed the formation of an internal electric field at the Fe 3 O 4 /B 4 C composites interface, which contributed the transfer of charge carriers between the Fe 3 O 4 and B 4 C. Moreover, the FeB composite showed a high stability, indicating that FeB composites may be a promising heterogeneous catalyst. • Fe 3 O 4 /B 4 C particles were prepared by a facile co-precipitation process. • Fe 3 O 4 /B 4 C is magnetically recyclable photocatalyst. • Fe 3 O 4 /B 4 C can be used as photocatalyst, and activator of H 2 O 2. • Fe 3 O 4 /B 4 C showed an excellent recyclability. [ABSTRACT FROM AUTHOR]

The present work investigates effects of micro-alloying Ag on the microstructure, mechanical properties and corrosion behavior of as-extruded Mg-2Zn-0.2Ca alloys. The addition of Ag, up to 0.5 wt%, induce limited difference on microstructural characteristics such as slightly coarser microstructures due to the enhanced dynamic recrystallization process and the presence of refined precipitates. The tensile properties of the alloy were not significantly changed by Ag addition, i.e., all the alloys exhibited exceptional elongation of ∼30%, moderate tensile yield strength and ultimate strength of ∼140 MPa and ∼240 MPa, respectively. The corrosion performance of the alloys was progressively deteriorated with increasing Ag content i.e., the corrosion rate increased from 0.40 ± 0.23 mm/y for Mg-2Zn-0.2Ca alloy to 3.27 ± 0.24 mm/y for the Mg-2Zn-0.2Ca-0.5Ag alloy. The compromised corrosion performance was attributed to a large electrode potential difference between the nobler Ca 2 Mg 6 Zn 3 phase and the α-Mg matrix as well as a less protective corrosion film, by increasing Ag addition. • Mg-2Zn-0.2Ca alloys with different contents of Ag produced through extrusion. • Ag addition (≤ 0.5 wt%) did not induce significant difference on microstructural characteristics. • Exceptional fracture elongation of ∼30% achieved from all the alloys. • Ag incorporation compromised the corrosion resistance of the Mg-2Zn-0.2Ca [ABSTRACT FROM AUTHOR]

The pursuit of novel cathode materials with excellent performance is the key to promoting the application of rechargeable magnesium batteries (RMBs). Herein, bimetallic copper-cobalt selenide (CuCo 2 Se 4) as a cathode material for RMBs, synthesized via a microwave-assisted method. In contrast to the monometallic selenide (Co 0.85 Se), CuCo 2 Se 4 exhibits a high reversible capacity of 108 mAh g−1 at 50 mA g−1 after 80 cycles, and a superior rate capability (90 mAh g−1 at 200 mA g−1). The crystal phase transition of the conversion electrode material during the cycles is analyzed using ex-situ XRD technology. The enhanced stability of bimetallic selenide provides a good experimental support for the preparation of high-performance rechargeable magnesium batteries based on bimetallic strategy. • Spinel CuCo 2 Se 4 nanosheets are synthesized by a microwave-anion-exchange route. • The bimetallic Co-Cu selenide with hierarchical structure has good cycling stability. • The magnesium storage mechanism of spinel CuCo 2 Se 4 is studied via ex-situ XRD. [ABSTRACT FROM AUTHOR]