Performance of CuO/Oxone system: Heterogeneous catalytic oxidation of phenol at ambient conditions

Efficient degradation of sulfamethazine with CuCo2O4 spinel nanocatalysts for peroxymonosulfate activation

“…For PMS activation by copper, however, the mechanisms are much more complicated due to the multiple oxidation states of copper and its highly unstable properties [37]. Some former studies proposed that "Cu 2þ on the catalyst surface was firstly reduced to "Cu þ by HSO À 5 when using CuO [22] and CuFe 2 O 4 [21,23] as the catalysts. However, this reaction is unreasonable when considering the standard thermodynamic parameters of Cu 2+ /Cu + (E 0 = 0.15 V [23]) and SO 2À 5 = Á SO À 5 (1.1 V).…”

“…Zhang et al compared several catalysts and found that the combination CuFe 2 O 4 /PMS has much higher degrading capability than that of MnFe 2 O 4 /PMS and Fe 2 O 3 /PMS, indicating "Cu 2þ is the active metal site [19]. Some previous publications proposed that during the catalytic reactions "Cu 2þ is firstly reduced to "Cu þ by HSO À 5 [21][22][23]. However, this process is thermodynamically unfavorable.…”

Heterogeneous degradation of refractory pollutants by peroxymonosulfate activated by CoOx-doped ordered mesoporous carbon

“…Therefore, it has the potential of becoming an alternative to the Å OH in wastewater treatment. Generally, peroxymonosulfate (PMS) and persulfate (PS) could be activated by alkaline [3,4], UV [5], heat [6,7] and transition metals [8] , Ce 3+ [8] and Cu + [9], among which Co 2+ has the highest reactivity for PMS. However, the possibly toxic and carcinogenic of Co 2+ limits its practical application in wastewater treatment.…”

Hierarchically-structured Co–CuBi 2 O 4 and Cu–CuBi 2 O 4 for sulfanilamide removal via peroxymonosulfate activation

“…On the other hand, the main mechanism of PMS activation by CuBi 2 O 4 composites to produce • OH is as follows [30][31][32]: (k SA+SO 4 • − ) is determined to be 6 × 10 9 M −1 s −1 via the competitive kinetic approach with benzene (k benzene+SO 4 • − = 3 × 10 9 M −1 s −1 ) as the chemical probe [33]. The second-order rate constants of the reaction of SA with • OH (k SA+ • OH ) is 1.6 × 10 9 M −1 s −1 [34].…”