Ternary Co…Ov…Cu sites trigger Co-utilization of endogenous electron donor-acceptor for sustainable removal of refractory low-carbon fatty amines in Fenton-like system
Qin Dai, Guangfei Yu, Juanjuan Qi, Yanan Wang, Lei Xing, Yihao Wang, Zhijie Zhang, Xiaolin Zhong, Zhimo Fang, Penghui Du, Lai Lyu, Lidong Wang
Abstract
Herein, we fabricated CoCu-0.25-O v with ternary Co … O v … Cu sites through simple co-precipitation to achieve effective co-utilization of organics and dissolved oxygen (DO) as endogenous electron donor-acceptor in Fenton-like system. Around 100% of dimethylamine (DMA) min within 30 is removed. The involved kinetics (0.22 min −1 ) and oxidant utilization efficiency (22.5%) are higher than controls with binary sites. Multi-scaled characterizations and theoretical calculations reveal that electron-polarized Co … O v … Cu sites facilitate co-activation of DMA and DO as electron donor-acceptor through increasing d -band center and lowering work function of catalyst. Meanwhile, ternary sites favor 1 O 2 and SO 4 •− generation, and shorten the migration distance of active species to pollutant, thus achieving excellent dual performance improvements. Semi-quantitative results of ESR indicate that DO activation and peroxymonosulfate (PMS) oxidation contribute about three-fourths and one-fourth to 1 O 2 production, respectively. This contribution provides a new and sustainable strategy for high-efficiency and oxidant-saving removal of refractory pollutants in the environment.