Removal of cyanide in aqueous solution by oxidation with hydrogen peroxide in presence of copper-impregnated activated carbon

Cyanide oxidation by singlet oxygen generated via reaction between H 2 O 2 from cathodic reduction and OCl − from anodic oxidation

“…Activated carbon fiber (ACF) is an attractive carbon material with excellent characteristics of adsorption, conductivity and catalysis [16]. [18] and this process always requires the use of catalysts to increase the cyanide removal efficiency [19]. Singlet oxygen, represented as 1 O 2 , is an excited form of molecular dioxygen, which includes two different metastable electronic configurations [20].…”

Decomposition of gaseous HCN in the presence of Ni-containing catalysts

“…They are considered among the most dangerous compounds for the environment and their toxicity is mainly due to their aptitude to release free cyanides. Different processes are proposed and used for the removal of cyanides in solutions and slurries [1][2][3][4][5][6][7][8][9][10][11][12].…”

“…The activated carbons, which are known as an excellent adsorbents, are widely used as catalysts and supports of catalysts [10,12,[17][18][19], in the mining industry for precious metal recovery and in polishing processes to remove low level cyanide concentration. For cyanide treatment, activated carbon and activated carbon impregnated with some transition metals have showed their effectiveness as an adsorbent and catalyst for the heterogeneous oxidation of cyanides and other pollutants.…”

Enhanced destruction of Cu(CN)32− by H2O2 under alkaline conditions in the presence of EDTA/pyrophosphate

“…Oxidation of various cyanide species by H 2 O 2 has been investigated previously. For instance, oxidation of free cyanide by H 2 O 2 was investigated in the presence of Ru/MgO [17], copper-impregnated pumice [18] and copper-impregnated activated carbon [19]. The rate of cyanide removal increased with the rise of initial molar ratio of H 2 O 2 to CN À and decreased with the increase of pH from 8.0 to 12.0.…”