N-doped aluminum-graphite (Al-Gr-N) composite for enhancing in-situ production and activation of hydrogen peroxide to treat landfill leachate

Herein we prepared a novel nitrogen-doping aluminum-graphite (Al-Gr-N) composite and applied for generating and activating H 2 O 2 to treat the landfill leachate. The results showed that Al-Gr-N composite could significantly enhance H 2 O 2 yield by oxygen reduction reaction (ORR), about 3 times higher than that of aluminum-graphite (Al-Gr) composite, due to its abundant N species, higher content of defects carbon atoms, higher surface area and porous volume, which enhanced the activity and selectivity toward two-electron pathway of ORR by increasing electron density, and promoting the mass transfer of reaction intermediates. The H 2 O 2 concentration achieved 2049 mg/L. The H + from the hydrolysis of in-situ generated Al 3+ could improve the ORR process, leading to high efficient production of H 2 O 2 at wide pH range. The in-situ generated Al 3+ could act as the coagulant to enhance the pollutant removal. This composite could effectively treat landfill leachate due to its high H 2 O 2 and nascent aluminum.