Traditional methods of cyanides’ (CN⁻) mineralization cannot overcome the contradiction between the high alkalinity required for the inhibition of hydrogen cyanide evolution and the low alkalinity required for the efficient hydrolysis of cyanate (CNO⁻) intermediates. Thus, in this study, a novel Electro-Fenton system was constructed, in which the free cyanides released from ferricyanide photolysis can be efficiently mineralized by the synergy of •OH and •O₂⁻. The complex bonds in ferricyanide (100 mL, 0.25 mM) were completely broken within 80 min under ultraviolet radiation, releasing free cyanides. Subsequently, in combination with the heterogeneous Electro-Fenton process, ^•OH and ^•O₂⁻ were simultaneously generated and 92.9% of free cyanides were transformed into NO₃^- within 120 min. No low-toxic CNO⁻ intermediates were accumulated during the Electro-Fenton process. A new conversion mechanism was proposed that CN⁻ was activated into electron-deficient cyanide radical (^•CN) by ^•OH, and then the ^•CN intermediates reacted with ^•O₂⁻ via nucleophilic addition to quickly form NO₃^-, preventing the formation of CNO⁻ and promoting the mineralization of cyanide. Furthermore, this new strategy was used to treat the actual cyanide residue eluent, achieving rapid recovery of irons and efficient mineralization of cyanides. In conclusion, this study proposes a new approach for the mineralization treatment of cyanide-containing wastewater.

传统的氰化物（CN ^- ）矿化方法无法克服抑制氰化氢析出所需的高碱度与氰酸盐（CNO ^- ）中间体高效水解所需的低碱度之间的矛盾。因此，在本研究中，构建了一种新型的Electro-Fenton系统，其中铁氰化物光解释放的游离氰化物可以通过·OH和·O ₂ ^-的协同作用被有效地矿化。铁氰化物（100 mL，0.25 mM）中的络合键在紫外线照射下 80 分钟内完全断裂，释放出游离氰化物。随后，结合非均相Electro-Fenton工艺，同时产生^• OH和^• O ₂ ^- ，并且在120分钟内92.9%的游离氰化物转化为NO ₃ ^- 。 Electro-Fenton 过程中没有积累低毒的 CNO ^-中间体。提出了一种新的转化机制：CN ^-被^• OH 激活为缺电子氰化物自由基（ ^• CN），然后^• CN 中间体与^• O ₂ ^-发生亲核加成反应，快速形成NO ₃ ^- ，从而阻止了NO 3 - 的形成。 CNO ^-并促进氰化物的矿化。此外，这种新策略被用于处理实际的氰化物残留洗脱液，实现了铁的快速回收和氰化物的高效矿化。 总之，本研究提出了一种含氰废水矿化处理的新方法。