In recent years, the widespread application of Mg alloy casting and Mg alloy products has generated a large amount of Mg alloy waste. This experiment used a single factor experimental analysis method to study the optimal process for removing Fe from Mg alloy AM50A waste, and developed an efficient Fe removal and regeneration process for Mg alloy AM50A. It was found that the optimal refining temperature for removing Fe ions was 670 °C, the optimal refining (RJ-2) agent mass ratio was 1.5%, and the optimal refining time was 40 min. Regenerated J40-1.5-AM50A Mg alloy was prepared using the best refining process, and its composition and mechanical properties were tested and analyzed. The experimental results show that the composition of the regenerated J40-1.5-AM50A Mg alloy prepared by this method is consistent with AM50A, with an Fe removal rate of 96.2%. The mechanical properties were improved compared to the original AM50A sample, with a maximum tensile strength increase of 1.611 KN and a tensile strength increase of 26.333 MPa. The elongation after fracture is 2.25 times that of the original sample. Research has shown that the RJ-2 refining agent can provide mechanical properties of magnesium alloys during the refining process. By analyzing the composition, XRD, SEM, and EDS of AM50A (Fe) and J40-1.5-AM50A, it was found that the refining process accelerates the removal of Fe in the form of Fe deposition.

The supercapacitor, as a novel energy storage device, possesses the advantages of rapid charging and discharging, extended cycle life, high power density, low energy density, excellent voltage resistance, large capacity, and more. Biomass serves as an ideal electrode material for supercapacitors due to its high carbon content, cost-effectiveness, and environmental friendliness. In this study, waste rambutan peel is utilized as the raw material and subjected to KOH activation following high-temperature pyrolysis to fabricate porous carbon materials with well-ordered pore size distribution. The rambutan peel electrode material exhibits a mass-specific capacitance of 285 F g^-1 (at 1 A g^-1 current density) and retains 105% after 5000 cycles of charge and discharge. This provides a direction for the reuse of biomass materials.