Degradation mechanism of HCN by electrochemically coupled copper-loaded magnetic nanoparticles in a liquid phase pseudo-homogeneous system
2022
Qu, Guangfei | Ji, Wei | Li, Junyan | Liang, Shuaiyu | Li, Zhishuncheng | Tang, Huimin | Zhou, Junhong | Ning, Ping
Hydrogen cyanide (HCN) comes from a wide range of sources, but it is highly toxic and corrosive, harming the environment and human health. This experiment used magnetic nano-Fe₃O₄ particles loaded with Cu (Cu-Fe₃O₄ magnetic nanoparticles) for electrochemical catalytic purification of HCN in a liquid phase pseudo-homogeneous system. The results show that the purification efficiency of Cu-Fe₃O₄ magnetic nanoparticles on HCN is 70% without electricity. After a certain voltage is applied, the degradation efficiency of 2 h with iron-carbon particles is significantly improved, and the degradation efficiency can reach about 95%. And the degradation efficiency increases with the increase of voltage. The electrochemical synergistic degradation mechanism of Cu-Fe₃O₄ magnetic nanoparticles is complex, which can directly catalyze the degradation of HCN or form CNO⁻ intermediates to further degrade into CO₂, H₂O, and NH₃. Meanwhile, Fe²⁺, Cu⁺, and other transition metal ions in the liquid phase participate in the Fenton-like reaction to further degrade HCN. The results show that the synergistic electrochemical degradation of HCN by Cu-Fe₃O₄ magnetic nanoparticles has excellent potential to degrade highly toxic gases.
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